AU2021107177A4 - A residual current circuit breaker with overcurrent protection - Google Patents

Abstract

This present application relates to a residual current circuit breaker with overcurrent protection, which comprises a housing, an operating mechanism, a moving contact, a static contact, a printed circuit board, an arc extinguishing mechanism, an electromagnetic tripping protection mechanism, and a thermal tripping protection mechanism, wherein both ends of the housing respectively is provided with input wiring terminals and output wiring terminals, wherein an arc chamber is provided in the housing, wherein the arc chamber is provided with a first guiding arc plate for fixing and connecting with the static contact, a second guiding arc plate is arranged relative to the first guiding arc plate and a flash barrier is located between the first guiding arc plate and the second guiding arc plate, wherein the flash barrier comprises a magnetic guiding component and a base covering on the magnetic guiding component, and the flash barrier and the second guiding arc plate are arranged at an internal. The present application has the advantages of high safety, bi-directional wiring and good arc guiding, arc extinguishing and magnetic conductivity. 4/9 FIGURES 21 311 231 211 23 234 1311 10 7,2 232 241 21 1312 31 1313 2 2541 1351322 _14 - - FIG. 4

Description

4/9

FIGURES

21 311 231 211 23 234

1311 10

7,2 232 241 21 1312 31 1313 2 2541

1351322

_14 - -

FIG. 4

Description

A RESIDUAL CURRENT CIRCUIT BREAKER WITH OVERCURRENT PROTECTION

TECHNICAL FIELD The present invention relations to a residual current circuit breaker with overcurrent

protection.

BACKGROUNDTECHNOLOGY A circuit breaker is a switching device that can close, load and break the current under

normal circuit conditions, and close, load and break the current under abnormal circuit

conditions within a specified time. A residual current circuit breaker with overcurrent

protection comprises a housing, an operating mechanism, a moving contact, a static

contact, a printed circuit board, an arc extinguishing mechanism, an electromagnetic

tripping protection mechanism, a thermal tripping protection mechanism and a testing

device, wherein both ends of the housing respectively is provided with input wiring

terminals and output wiring terminals, wherein an arc chamber is provided in the

housing, wherein the arc chamber is provided with a first arc guiding plate or fixing and

connecting with the static contact, a second arc guiding plate is arranged relative to the

first arc guiding plate and an flash barrier is located between the first arc guiding plate

and the second arc guiding plate, wherein the flash barrier comprises a magnetic guiding

component and a base covering on the magnetic guiding component, the base is

connected against the second arc guiding plate, when the moving contact is broken off

from the static contact, metal ions will be generated, which are easy to attach to the base

and form a conductive dielectric, making the first arc guiding plate conduct electricity

through the base and the second arc guiding plate, thus reducing the insulation capacity

of the base and the voltage resistance, it is easy to break down the second arc guiding

plate during the withstand voltage test and the risk is high, and there is only one wiring

connected direction of existing circuit breaker, only one input wiring terminal and one

output wiring terminal for a circuit breaker, and the input wiring terminal cannot be

used as the output wiring terminal, the output wiring terminal also cannot be used as

Description the input wiring terminal, despite markings warnings on the circuit breaker are shown,

however, in the process ofusing the circuit breaker, the users cannot completely avoid

the wrong connection accidentally, if the circuit breaker closes and the test button is

pressed at this time, the circuit breaker will be burnt out, resulting in unpredictable

consequences.

CONTENTS OF INVENTION Based on the above mentioned issues, this invention aims to provide a residual current

circuit breaker with overcurrent protection with high safety, bi-directional wiring and

good arc conduction, arc extinguishing and magnetic conductivity.

In respect of the above issue, the following technical scheme is provided: A residual

current circuit breaker with overcurrent protection comprises a housing, an operating

mechanism, a moving contact, a static contact, a printed circuit board, an arc

extinguishing mechanism, an electromagnetic tripping protection mechanism, and a

thermal tripping protection mechanism, wherein the operating mechanism comprises a

handle, a support shaft arranged in the housing, a support rotationally connected with

the support shaft and a lock catch, wherein both ends of the housing respectively is

provided with input wiring terminals and output wiring terminals, wherein an arc

chamber is provided in the housing, wherein the arc chamber is provided with a first

arc guiding plate for fixing and connecting with the static contact, a second arc guiding

plate is arranged relative to the first arc guiding plate and an flash barrier is located

between the first arc guiding plate and the second arc guiding plate, wherein the flash

barrier comprises a magnetic guiding component and a base covering on the magnetic

guiding component, wherein the electromagnetic tripping protection mechanism

comprises a magnetic steel. A fixing plate is arranged on one side of the handle, wherein

a conductive bridge is arranged on one side of the fixing plate facing away from the

handle, the upper and lower side of the conductive bridge are arranged on the fixing

plate for fixing the conductive bridge is provided with a block, wherein the conductive

bridge is provided with a conductive torsion spring, wherein the support is provided

Description with a driving block, wherein the bottom of fixing plate is provided with an opening groove used for motion of a driving block, wherein one end of the conductive torsion spring is against the magnetic steel, the other end is arranged at an interval with the conductive bridge end or driven by the driving block and connected with the conductive bridge end, wherein a power supply line of the printed circuit board is electrically connected with one end of the conductive bridge, wherein the flash barrier and the second arc guiding plate are arranged at intervals.

In the above structure, when the circuit breaker is closed by the handle, the handle drives the support to rotate, the support drives the driving block to move relative to the opening groove, and drives one end of the conductive torsion spring to the conductive bridge, the printed circuit board is connected to the mains to realize power supply. When the circuit breaker is opened by the handle, the handle drives the support to rotate, the support drives the driving block to resent, and the conductive torsion spring resets the end of the conductive bridge by its own torque to realize the disconnection of the circuit, and the printed circuit board is not charged, so that no matter which end of the invention is connected by the user. After the circuit breaker closing, the printed circuit board and electromagnetic tripping protection mechanism charged in working state, in case of leakage, the printed circuit board and the electromagnetic tripping protection mechanism are no longer charged and cannot form a path after the triggering condition of the circuit breaker is broken, and the electromagnetic tripping protection mechanism cannot form a circuit, so that the circuit breaker will not continue to be damaged and provide a purpose of protecting the circuit breaker. By setting at intervals between the flash barrier and the second arc guiding plate making them to produce a gap to improve the creepage distance between the first arc guiding plate and the second arc guiding plate, and also improve the insulation effect between the base and the second arc guiding plate, even if the dielectric is generated on the base, the first arc guiding plate and the second arc guiding plate will not be conductive, thus improving the safety of this invention.

Description

This invention may be set in the following way: Wherein the electromagnetic tripping

protection mechanism comprises a tripping coil located in the housing, wherein arc

extinguishing mechanism comprise a arc chute located in the arc chamber, wherein the

first arc guiding plate comprises an electricity connection plate area electrically

connected with one end of the tripping coil, a supporting plate area for fixing the static

contact, a U-shaped arc striking area and a positioning area located on the top wall of

the arc chute, wherein the second arc guiding plate comprises a limiting plate area on

the side of a moving contact away from the static contact, a arc guiding area bent into

an arc shape and an arc quenching area at the bottom of the arc chute, wherein the arc

striking area are set up pointing to the arc guiding area, wherein the flash barrier is

located on one side of the arc striking area towards inner wall of the arc chamber,

wherein the base is arranged at intervals towards an external edge of the arc guiding

area relative to the arc guiding area, wherein the base is extended downward towards

the side of arc quenching area to form a limiting portion, wherein the arc chamber is

provided with a limiting block which is offset with the limiting portion towards the side

of the arc guiding area.

In the above structure, the arc striking area is the U-shape setting of the arc guiding area

to make a short distance between the arc striking area and the arc guiding area, therefore,

the base toward the outer edge of the arc guiding area relative to the arc guiding area is

arranged at internal, which can increase the creepage distance between the arc striking

area and the arc guiding area, the possibility of conduction between the arc striking area

and the arc guiding area is avoided thus improving the safety of this invention. The

positioning and installation of the base can be facilitated by matching the limiting

portion and the limiting block, and the stability of the base can be improved and the

reliability of this invention is improved.

Description

This invention may be set in the following way: The base is arranged at an edge chamfer

angle on the upper surface of one side of the arc guiding area.

With the above structure, the distance between the base surface and the arc guiding area

can be further increased, thus further improving the safety of the invention.

This invention may be set in the following way: wherein a U-shaped opening of the arc

striking area is provided with a corresponding first magnetic conductive plate.

With the above structure, when this invention is breaking off, the magnetic blow

generated in the arc chamber can be quickly guided to the arc chute, and extinguish the

arc, thus the arc extinguishing efficiency and safety of this invention improved.

This invention may be set in the following way: wherein a second magnetic conductive

plate is arranged on one side of the arc guiding area and the flash barrier.

With the above structure, the magnetic blowing formed between the arc striking area

and the limiting plate area can be quickly guided to the arc guiding area, and the

magnetic blowing can be quickly guided to the arc chute with the first magnetic

conductive plate, the strength of the second magnetic conductive plate can also be

improved, thus further improving the safety and the reliability of this invention.

This invention may be set in the following way: wherein the support is provided with a

supporting pillar arranged on the support shaft, wherein the supporting pillar is provided

with a fixing pillar, wherein the fixing pillar is provided with a supporting plate

integrated with the moving contact, wherein a torsion spring is arranged on the outer

side of the relative supporting plate on the fixing pillar, wherein the support is provided

with a fixing block above the fixing pillar, wherein one end of the torsion spring is

Description against the fixing block, the other end is against the supporting plate to the outer edge of the static contact, wherein one side of the top of the supporting plate towards the electromagnetic tripping protection mechanism is provided with a butting component that is against the supporting pillar, wherein the handle is connected with the top of the support through a fitting, wherein the top of the support is provided with a reset block, wherein a positioning groove is provided in the housing, wherein a return spring is arranged between the positioning groove and the reset block.

In the above structure, the handle controls the lock catch and the support to rotate relative to the support shaft through the fitting, so that the moving contact and the static contact are separated and closed, and the opening and closing of this invention are realized. By setting the supporting plate, the moving contact can be easily linked with the support, and it is convenient for the installation of the moving contact, thus improving the convenience of this invention; By setting the butting component, the stability of the moving contact movement driven by the support can be improved, and the moving contact can realize fast closing, thus improving the reliability of this invention; By setting the torsion spring, the moving contact can be quickly reset, and it can slow the force when the moving contact and static contact are connected together, thus improving the service life of the moving contact and improving the reliability of this invention; By setting the return spring, the support can be quickly reset by the elastic force of the return spring when this this invention opens, thus improving the speed of the opening of this invention and improving the reliability of this invention. The operating mechanism of this invention is compact, it is used the support instead of jump buckle, reduced the settings of the components, so that the volume of the product mechanism is reduced, and a larger arc extinguishing mechanism can be set in free space, thus improving the breaking capacity of this invention.

This invention may be set in the following way: wherein the operating mechanism comprises a reset pin, wherein a positioning hole is arranged on the bottom of the lock

Description catch, wherein one end of the return pin is provided with a first sliding groove that is

) matched with the positioning hole through a latch, and the other end is provided with a

clamping block that is matched with the thermal tripping protection mechanism,

wherein a positioning pillar is arranged above the limiting plate area in the housing,

5 wherein the return pin is provided with a second sliding groove compatible with the

positioning pillar, wherein the return pin is linked with the lock catch to realize the

horizontal displacement.

In the above structure, in the closing stage of this invention, the clamping block on the

10 return pin is connected with the thermal tripping protection mechanism, when the

thermal tripping protection mechanism began to take effect, the thermal tripping

protection mechanism can control the horizontal displacement of the return pin by the

clamping block, the return pin drives the lock catch to rotate and reset by the latch, the

lock catch drives the handle and support to reset, and the support drives the moving

15 contact to reset, so that this invention is in the state of opening. The reliability of this

invention can be improved by setting the return pin. By setting the first sliding groove

can facilitate the installation of the return pin. By setting the second sliding groove, it

can be coordinated with the positioning pillar to limit the return pin, and can facilitate

the installation of the return pin, so as to improve the displacement stability of the return

20 pin and improve the reliability of this invention.

This invention may be set in the following way: wherein a first arc spraying nozzle is

arranged on the side wall of the housing, wherein the arc chamber is connected with the

first arc spraying nozzle through the guiding arc channel, wherein the arc guiding

25 channel is provided with an arc suppression plate, wherein the arc suppression plate is

arranged along the first arc spraying nozzle and is arranged at intervals towards the

bottom of the housing, wherein the bottom of the housing is provided with a second arc

spraying nozzle connected with the guiding arc channel, and a plurality of arc

suppression channel are formed between a plurality of suppression plates arranged in

Description the direction of the second spraying nozzle, wherein the arc suppression plate is provided with an opening connected with each arc suppression channel.

In the above structure, the arc is elongated through the guiding arc channel, and the arc is blocked and weakened by the arc suppression plate, so as to reduce the arc intensity from the first arc spraying nozzle and the second arc spraying nozzle, which improved the safety and reached the standard of the circuit breaker for this invention. By setting the opening can facilitate the dredging between each suppression channel, realize the cutting arc, and it is easy for arc starting and arcing, which can reduce the strength of arc suppression plate, and further improve the strength of arc suppression plate, and can further increase the arc path from the first arc spraying nozzle and the second arc spraying nozzle, effectively weaken the arc strength, thus improved the reliability and safety of this invention.

This invention may be set in the following way: wherein a plurality of the second arc spraying nozzles are interlaced.

With the above structure, the electric arc emitted by the second arc spraying nozzle can be further weakened, so that it tends to be zero, thus further improving the reliability and safety of this invention.

This invention may be set in the following way: wherein an arc discharge outlet is arranged on the side wall opposite the side wall where the housing and the first arc spraying nozzle, wherein the housing is provided with an mounting cavity for assembling the printed circuit board, wherein the outer side wall of the mounting cavity toward the top of the housing is provided with an arc baffle plate wherein the outer side of the arc baffle plate is coordinated with the inner wall of the housing to form the arc discharge channel for communicating the arc chamber and the arc discharge outlet.

Description In the above structure, when this invention is used for high current, the second arc guiding plate will produce high temperature and high pressure gas, the gas is easy to break the housing, therefore, the gas can be discharged from the arc discharge outlet through the arc discharge channel by setting the arc discharge outlet, and the internal pressure of the housing is depressurized, so as to improve the stress strength of the housing and improve the reliability and safety of this invention. By setting the arc baffle plate, the mounting cavity can be closed to avoid damage to the printed circuit board caused by high temperature and high pressure gas entering the mounting cavity, thus improving the safety and reliability of this invention.

This invention may be set in the following way: The height of the arc baffle plate is higher than the height of the side wall of the mounting cavity.

With the above structure, the shielding area of the arc baffle plate can be improved, the sealing property of the mounting cavity relative to the arc discharge channel can be improved, and the reliability of this invention can be improved.

This invention may be set in the following way: wherein the first arc spraying nozzle is located at the lower of the input wiring terminal, wherein the arc discharge outlet is located at the lower side of the output wiring terminal.

With the above structure, the electric arc can be avoided to affect the wire connected with this invention, thus improving the reliability of this invention.

DESCRIPTION OF FIGURES FIG. 1 is a first perspective view of the present invention; FIG. 2 is a second perspective view of the present invention; FIG. 3 is a breakdown structural schematic of the housing according to the present invention;

Description FIG. 4 is an internal structural schematic of the housing according to the present

invention;

FIG. 5 is a structural schematic of the flash barrier according to the present invention;

FIG. 6 is a structural schematic of the return pin according to the present invention;

FIG. 7 is a structural schematic of the limiting block in the are chamber according to

the present invention;

FIG. 8 is a structural schematic of the arc baffle plate according to the present invention;

FIG. 9 is a structural schematic of the inner wall of the housing according to the present

invention.

The name in the figures: 1-Housing; 2-Operating Mechanism; 3-Moving Contact; 4

Static contact; 5-Printed Circuit Board; 6-Arc Extinguishing Mechanism; 7

Electromagnetic Tripping Protection Mechanism; 9-Thermal Tripping Protection

Mechanism; 21-Handle; 22-Support Shaft; 23-Support; 24-Lock Catch; 71-Magnetic

Steel; 20-Fixing Plate; 201-Conductive Bridge; 202-Block; 203-Conductive Torsion

Spring; 204-Driving Block; 205-Opening Groove; 231-Supporting Pillar; 232-Fixing

pillar; 31-Supporting Plate; 2321-Torsion Spring; 233-Fixing Block; 311-Butting

Component; 211-Fitting; 234-Reset Block; 10-Positioning Groove; 101-Return Spring;

25-Reset Pin; 241-Positioning Hole; 251-Latch; 252-First Sliding Groove; 253

Clamping block; 254-Second Sliding Chute; 2541-Positioning Pillar; 11-Input Wiring

Terminal; 12-Output Wiring Terminal; 13-Arc Chamber; 131-First Arc Guiding Plate;

132-Second Arc Guiding Plate; 133-Base; 72-Tripping Coil; 61-Arc Chute; 1311

Electricity Connection Plate Area; 1312-Supporting Plate Area; 1313-Arc Striking Area;

1314-Positioning Area; 1321-Limiting Plate Area; 1322-Arc Guiding Area; 1323-Arc

Quenching Area; 1331-Limiting portion; 134-Limiting Block; 135-First Magnetic

Conductive Plate; 136-Second Magnetic Conductive Plate; 14-First Arc Spraying

Nozzle; 15-Arc Guiding Channel; 8-Arc Suppression Plate; 16-Second Arc Spraying

Nozzle; 151-Arc Suppression Channel; 81-Opening; 17-Arc Discharge Outlet; 18

Mounting Cavity; 181- Arc Baffle Plate; 19-Arc Discharge Channel

Description SPECIFIC WAYS OF IMPLEMENTING THE INVENTION

) The present invention will be further described with reference to the implementation

examples and figures. The following implementation examples are used to illustrate

this invention, but not limit the scope of this invention.

5 What needs illustration is that all directional instructions of following implementing

ways in this invention (such as up, down, left, right, front, behind, front and back...)

is only used to explain in a specific posture (as shown in the drawings)under the relative

position and motion of each component, if the specific posture is changed, then the

directional instructions also changed accordingly.

10

A residual current circuit breaker with overcurrent protection as shown in FIG. 1-9,

which comprises a housing (1), an operating mechanism (2), a moving contact (3), a

static contact (4), a printed circuit board (5), an arc extinguishing mechanism (6), an

electromagnetic tripping protection mechanism (7), and a thermal tripping protection

15 mechanism (9), wherein the operating mechanism (2) comprises a handle (21), a

support shaft (22) arranged in the housing, a support (23) rotationally connected with

the support shaft and a lock catch (24), wherein both ends of the housing respectivelyy

is provided with input wiring terminals (11) and output wiring terminals (12), wherein

an arc chamber (13) is provided in the housing (1), wherein the arc chamber (13) is

20 provided with a first arc guiding plate (131) for fixing and connecting with the static

contact (4), a second arc guiding plate (132) is arranged relative to the first arc guiding

plate (131) and an flash barrier is located between the first arc guiding plate (131) and

the second arc guiding plate (132), wherein the flash barrier comprises a magnetic

guiding component and a base (133) covering on the magnetic guiding component,

25 wherein the electromagnetic tripping protection mechanism (7) comprises a magnetic

steel (71). A fixing plate (20) is arranged on one side of the handle (21), wherein a

conductive bridge (201) is arranged on one side of the fixing plate (20) facing away

from the handle (21), the upper and lower side of the conductive bridge (201)are

arranged on the fixing plate (20) for fixing the conductive bridge (201) is provided with

Description a block (202), wherein the conductive bridge (201) is provided with a conductive

torsion spring (203), wherein the support (23) is provided with a driving block (204),

wherein the bottom of fixing plate (20) is provided with an opening groove (205) used

for motion of a driving block (204), wherein one end of the conductive torsion spring

(203) is against the magnetic steel (71), the other end is arranged at an interval with the

conductive bridge (201) end or driven by the driving block (204) and connected with

the conductive bridge (201) end, wherein a power supply line of the printed circuit

board is electrically connected with one end of the conductive bridge (201), wherein

the flash barrier (132) and the second arc guiding plate are arranged at intervals.

In the above structure, when the circuit breaker is closed by the handle (21), the handle

(21) drives the support (23) to rotate, the support (23) drives the driving block (204) to

move relative to the opening groove (205), and drives one end of the conductive torsion

spring (203) to the conductive bridge (201), the printed circuit board is connected to the

mains to realize power supply. When the circuit breaker is opened by the handle (21),

the handle (21) drives the support (23) to rotate, the support (23) drives the driving

block (204) to resent, and the conductive torsion spring (203) resets the end of the

conductive bridge (201) by its own torque to realize the disconnection of the circuit,

and the printed circuit board is not charged, so that no matter which end of the invention

is connected by the user. After the circuit breaker closing, the printed circuit board and

electromagnetic tripping protection mechanism (7) charged in working state, in case of

leakage, the printed circuit board and the electromagnetic tripping protection

mechanism (7) are no longer charged and cannot form a path after the triggering

condition of the circuit breaker is broken, and the electromagnetic tripping protection

mechanism (7) cannot form a circuit, so that the circuit breaker will not continue to be

damaged and provide a purpose of protecting the circuit breaker. By setting at intervals

between the flash barrier and the second arc guiding plate (132) making them to produce

a gap to improve the creepage distance between the first arc guiding plate (131) and the

second arc guiding plate (132), and also improve the insulation effect between the base

Description (133) and the second arc guiding plate (132), even if the dielectric is generated on the base (133), the first arc guiding plate (131) and the second arc guiding plate (132) will not be conductive, thus improving the safety of this invention.

In this implementing way, wherein the electromagnetic tripping protection mechanism (7) comprises a tripping coil (72) located in the housing, wherein arc extinguishing mechanism (6) comprise a arc chute located in the arc chamber (13), wherein the first arc guiding plate (131) comprises an electricity connection plate area (1311) electrically connected with one end of the tripping coil (72), a supporting plate area (1312) for fixing the static contact (4), a U-shaped arc striking area (1313) and a positioning area (1314) located on the top wall of the arc chute (61), wherein the second arc guiding plate (132) comprises a limiting plate area (1321) on the side of a moving contact (3) away from the static contact (4), a arc guiding area (1322) bent into an arc shape and an arc quenching area (1323) atthebottom ofthe arc chute (61), whereinthe arc striking area (1313) are set up pointing to the arc guiding area (1322), wherein the flash barrier is located on one side of the arc striking area (1313) towards inner wall of the arc chamber (13), wherein the base (133) is arranged at intervals towards an external edge of the arc guiding area (1322) relative to the arc guiding area (1322), wherein the base (133) is extended downward towards the side of arc quenching area (1323) to form a limiting portion (1331), wherein the arc chamber (13) is provided with a limiting block (134), which is offset with the limiting portion (1331) towards the side of the arc guiding area (1322).

In the above structure, the arc striking area (1313) is the U-shape setting of the arc guiding area (1322) to make a short distance between the arc striking area (1313) and the arc guiding area (1322), therefore, the base (133) toward the outer edge of the arc guiding area (1322) relative to the arc guiding area (1322) is arranged at internal, which can increase the creepage distance between the arc striking area (1313) and the arc guiding area (1322), the possibility of conduction between the arc striking area (1313)

Description and the arc guiding area (1322) is avoided, thus improving the safety of this invention.

The positioning and installation of the base (133) can be facilitated by matching the

limiting portion (1331) and the limiting block (134), and the stability of the base (133)

can be improved and the reliability of this invention is improved.

In this implementing way, the base (133) is arranged at an edge chamfer angle on the

upper surface of one side of the arc guiding area (1322).

With the above structure, the distance between the base (133) surface and the arc

guiding area (1322) can be further increased, thus further improving the safety of the

invention.

In this implementing way, wherein a U-shaped opening of the arc striking area (1313)

is provided with a corresponding first magnetic conductive plate.

With the above structure, when this invention is breaking off, the magnetic blow

generated in the arc chamber (13) can be quickly guided to the arc chute, and extinguish

the arc, thus the arc extinguishing efficiency and safety of this invention improved.

In this implementing way, wherein a second magnetic conductive plate (136) is

arranged on one side of the arc guiding area (1322) and the flash barrier.

With the above structure, the magnetic blowing formed between the arc striking area

(1313) and the limiting plate area (1321) can be quickly guided to the arc guiding area

(1322), and the magnetic blowing can be quickly guided to the arc chute with the first

magnetic conductive plate (135), the strength of the second magnetic conductive plate

(132) can also be improved, thus further improving the safety and the reliability of this

invention.

Description This invention may be set in the following way: wherein the support (23) is provided

with a supporting pillar (231) arranged on the support shaft (22), wherein the supporting

pillar (231) is provided with a fixing pillar (232), wherein the fixing pillar (232) is

provided with a supporting plate (31) integrated with the moving contact (3), wherein

a torsion spring (2321) is arranged on the outer side of the relative supporting plate (31)

on the fixing pillar (232), wherein the support (23) is provided with a fixing block (233)

above the fixing pillar (232), wherein one end of the torsion spring (2321) is against the

fixing block (233), the other end is against the supporting plate (31) to the outer edge

of the static contact (4), wherein one side of the top of the supporting plate (31) towards

the electromagnetic tripping protection mechanism (7) is provided with a butting

component (311) that is against the supporting pillar (231), wherein the handle (21) is

connected with the top of the support (23) through a fitting (211), wherein the top of

the support (23) is provided with a reset block (234), wherein a positioning groove (10)

is provided in the housing (1), wherein a return spring (101) is arranged between the

positioning groove (10) and the reset block (234).

In the above structure, the handle (21) controls the lock catch (24) and the support (23)

to rotate relative to the support shaft (22) through the fitting (211), so that the moving

contact (3) and the static contact (4) are separated and closed, and the opening and

closing of this invention are realized. By setting the supporting plate (31), the moving

contact (3) can be easily linked with the support (23), and it is convenient for the

installation of the moving contact (3), thus improving the convenience of this invention;

By setting the butting component (311), the stability of the moving contact (3)

movement driven by the support (23) can be improved, and the moving contact (3) can

realize fast closing, thus improving the reliability of this invention; By setting the

torsion spring (2321), the moving contact (3) can be quickly reset, and it can slow the

force when the moving contact (3) and static contact (4) are connected together, thus

improving the service life of the moving contact (3) and improving the reliability of this

invention; By setting the return spring (101), the support can be quickly reset by the

Description elastic force of the return spring when this this invention opens, thus improving the speed of the opening of this invention and improving the reliability of this invention. The operating mechanism (2) of this invention is compact, it is used the support (23) instead of jump buckle, reduced the settings of the components, so that the volume of the product mechanism is reduced, and a larger arc extinguishing mechanism (6) can be set in free space, thus improving the breaking capacity of this invention.

This invention may be set in the following way: wherein the operating mechanism (2) comprises a return pin (25), wherein a positioning hole (241) is arranged on the bottom of the lock catch (24), wherein one end of the return pin (25) is provided with a first sliding groove (252) that is matched with the positioning hole (241) through a latch (251), and the other end is provided with a clamping block (253) that is matched with the thermal tripping protection mechanism (9), wherein a positioning pillar (2541) is arranged above the limiting plate area (1321) in the housing (1), wherein the return pin (25) is provided with a second sliding groove (254) compatible with the positioning pillar (2541), wherein the return pin (25) is linked with the lock catch (24) to realize the horizontal displacement.

In the above structure, in the closing stage of this invention, the clamping block (253) on the return pin (25) is connected with the thermal tripping protection mechanism (9), when the thermal tripping protection mechanism (9) began to take effect, the thermal tripping protection mechanism (9) can control the horizontal displacement of the return pin (25) by the clamping block (253), the return pin (25) drives the lock catch (24) to rotate and reset by the latch (251), the lock catch (24) drives the handle (21) and support (23) to reset, and the support (23) drives the moving contact (3) to reset, so that this invention is in the state of opening. The reliability of this invention can be improved by setting the return pin (25). By setting the first sliding groove (252) can facilitate the installation of the return pin (25). By setting the second sliding groove (254), it can be coordinated with the positioning pillar (2541) to limit the return pin (25), and can

Description facilitate the installation of the return pin (25), so as to improve the displacement

stability of the return pin (25) and improve the reliability of this invention.

In this implementing way, wherein a first arc spraying nozzle (14) is arranged on the

side wall of the housing (1), wherein the arc chamber (13) is connected with the first

arc spraying nozzle (14) through the arc guiding channel(15), wherein the arc guiding

channel(15) is provided with an arc suppression plate (8), wherein the arc suppression

plate (8) is arranged along the first arc spraying nozzle (14) and is arranged at intervals

towards the bottom of the housing (1), wherein the bottom of the housing (1) is provided

with a second arc spraying nozzle (16) connected with the arc guiding channel(15), and

a plurality of arc suppression channel (151) are formed between a plurality of

suppression plates (8) arranged in the direction of the second spraying nozzle (16),

wherein the arc suppression plate (8) is provided with an opening (81) connected with

each arc suppression channel (151).

In the above structure, the arc is elongated through the arc guiding channel (15), and

the arc is blocked and weakened by the arc suppression plate (8), so as to reduce the arc

intensity from the first arc spraying nozzle (14) and the second arc spraying nozzle (16),

which improved the safety and reached the standard of the circuit breaker for this

invention. By setting the opening (81) can facilitate the dredging between each

suppression channel (151), realize the cutting arc, and it is easy for arc starting and

arcing, which can reduce the strength of arc suppression plate (8), and further improve

the strength of arc suppression plate (8), and can further increase the arc path from the

first arc spraying nozzle (14) and the second arc spraying nozzle (16), effectively

weaken the arc strength, thus improved the reliability and safety of this invention.

In this implementing way: wherein a plurality of the second arc spraying nozzles (16)

are interlaced.

Description With the above structure, the electric arc emitted by the second arc spraying nozzle (16) can be further weakened, so that it tends to be zero, thus further improving the reliability and safety of this invention.

In this implementing way: wherein an arc discharge outlet (17) is arranged on the side wall opposite the side wall where the housing (1) and the first arc spraying nozzle (14), wherein the housing (1) is provided with an mounting cavity (18) for assembling the printed circuit board (5), wherein the outer side wall of the mounting cavity (18) toward the top of the housing (1) is provided with an arc baffle plate (181), wherein the outer side of the arc baffle plate (181) is coordinated with the inner wall of the housing (1) to form the arc discharge channel (19) for communicating the arc chamber (13) and the arc discharge outlet (17).

In the above structure, when this invention is used for high current, the second arc guiding plate will produce high temperature and high pressure gas, the gas is easy to break the housing (1), therefore, the gas can be discharged from the arc discharge outlet (17) through the arc discharge channel (19) by setting the arc discharge outlet (17), and the internal pressure of the housing (1) is depressurized, so as to improve the stress strength of the housing (1) and improve the reliability and safety of this invention. By setting the arc baffle plate (181), the mounting cavity (18) can be closed to avoid damage to the printed circuit board (5) caused by high temperature and high pressure gas entering the mounting cavity (18), thus improving the safety and reliability of this invention.

In this implementing way: The height of the arc baffle plate (181) is higher than the height of the side wall of the mounting cavity (18).

Description With the above structure, the shielding area of the arc baffle plate (181) can be improved, ) the sealing property of the mounting cavity (18) relative to the arc discharge channel (19) can be improved, and the reliability of this invention can be improved.

5 In this implementing way: wherein the first arc spraying nozzle (14) is located at the lower of the input wiring terminal (11), wherein the arc discharge outlet (17) is located at the lower side of the output wiring terminal (12).

With the above structure, the electric arc can be avoided to affect the wire connected 10 with this invention, thus improving the reliability of this invention.

The above descriptions are only the preferred implementation mode of this invention. It should be pointed out that for an ordinary technical personnel in the technical field, some improvements and variants can be made on the premise without breaking away 15 from the technical principle of this invention, and these improvements and variants

referred to above shall also be regarded as within the protection scope of this invention.

Claims (10)

1. Claims 1. A residual current circuit breaker with overcurrent protection comprises a housing,

   an operating mechanism, a moving contact, a static contact, a printed circuit board,

   an arc extinguishing mechanism, an electromagnetic tripping protection mechanism,

   and a thermal tripping protection mechanism, wherein both ends of the housing

   respectively is provided with input wiring terminals and output wiring terminals,

   wherein an arc chamber is provided in the housing, wherein the arc chamber is

   provided with a first arc guiding plate for fixing and connecting with the static

   contact, a second arc guiding plate is arranged relative to the first arc guiding plate

   and an flash barrier is located between the first arc guiding plate and the second arc

   guiding plate, wherein the flash barrier comprises a magnetic guide component and

   a base covering on the magnetic guide component, wherein the operating mechanism

   comprises a handle, a support shaft arranged in the housing, a support rotatably

   connected with the support shaft and a lock catch, wherein the electromagnetic

   tripping protection mechanism comprises a magnetic steel, wherein a fixing plate is

   arranged on one side of the handle, wherein a conductive bridge is arranged on one

   side of the fixing plate facing away from the handle, the upper and lower side of the

   conductive bridge are arranged on the fixing plate for fixing the conductive bridge

   is provided with a block, wherein the conductive bridge is provided with a

   conductive torsion spring, wherein the support is provided with a driving block,

   wherein the bottom of fixing plate is provided with an opening groove used for

   motion of a driving block, wherein one end of the conductive torsion spring is against

   the magnetic steel, the other end is arranged at an interval with the conductive bridge

   end or driven by the driving block and connected with the conductive bridge end,

   wherein a power supply line of the printed circuit board is electrically connected

   with one end of the conductive bridge, and wherein the flash barrier and the second

   arc guiding plate are arranged at intervals.
2. 2. A residual current circuit breaker with overcurrent protection according to claim 1,

   wherein the electromagnetic tripping protection mechanism comprises a tripping coil

   located in the housing, wherein the first arc guiding plate comprises an electricity

   Claims connection plate area electrically connected with one end of the tripping coil, a

   supporting plate area for fixing the static contact, a U-shaped arc striking area and a

   positioning area located on the top wall of the arc chute, wherein the second arc

   guiding plate comprises a limiting plate area on the side of a moving contact away

   from the static contact, an arc guiding area bent into an arc shape and an arc

   quenching area at the bottom of the arc chute, wherein the arc striking area are set

   up pointing to the arc guiding area, wherein the flash barrier is located on one side

   of the arc striking area towards inner wall of the arc chamber, wherein the base is

   arranged at intervals towards an external edge of the arc guiding area relative to the

   arc guiding area, wherein the base is extended downward towards the side of arc

   quenching area to form a limiting portion, and wherein the arc chamber is provided

   with a limiting block which is offset with the limiting portion towards the side of the

   arc guiding area.
3. 3. A residual current circuit breaker with overcurrent protection according to claim 2,

   wherein the base is arranged at an edge chamfer angle on the upper surface of one

   side of the arc guiding area.
4. 4. A residual current circuit breaker with overcurrent protection according to claim 3,

   wherein a U-shaped opening of the arc striking area is provided with a corresponding

   first magnetic conductive plate.
5. 5. A residual current circuit breaker with overcurrent protection according to claim 4,

   wherein a second magnetic conductive plate is arranged on one side of the arc

   guiding area and the flash barrier.
6. 6. A residual current circuit breaker with overcurrent protection according to claim 2,

   wherein the support is provided with a supporting pillar arranged on the support shaft,

   wherein the supporting pillar is provided with a fixing pillar, wherein the fixing pillar

   is provided with a supporting plate integrated with the moving contact, wherein a

   torsion spring is arranged on the outer side of the relative supporting plate on the

   fixing pillar, wherein the support is provided with a fixing block above the fixing

   pillar, wherein one end of the torsion spring is against the fixing block, the other end

   Claims is against the supporting plate to the outer edge of the static contact, wherein one

   side of the top of the supporting plate towards the electromagnetic tripping

   protection mechanism is provided with a butting component that is against the

   supporting pillar, wherein the handle is connected with the top of the support through

   a fitting, wherein the top of the supporting is provided with a reset block, wherein a

   positioning groove, and wherein a return spring is arranged between the positioning

   groove and the reset block.
7. 7. A residual current circuit breaker with overcurrent protection according to claim 6,

   wherein the operating mechanism comprises a return pin, wherein a positioning hole

   is arranged on the bottom of the lock catch, wherein one end of the return pin is

   provided with a first sliding groove that is matched with the positioning hole through

   a latch, and the other end is provided with a clamping block that is matched with the

   thermal tripping protection mechanism, wherein a positioning pillar is arranged

   above the limiting plate area in the housing, and wherein the return pin is provided

   with a second sliding groove compatible with the positioning pillar, wherein the

   return pin is linked with the lock catch to realize the horizontal displacement.
8. 8. A residual current circuit breaker with overcurrent protection according to claim 2,

   wherein a first arc spraying nozzle is arranged on the side wall of the housing,

   wherein the arc chamber is connected with the first arc spraying nozzle through the

   arc guiding channel, wherein the arc guiding channel is provided with an arc

   suppression plate, wherein the arc suppression plate is arranged along the first arc

   spraying nozzle and is arranged at intervals towards the bottom of the housing,

   wherein the bottom of the housing is provided with a second arc spraying nozzle

   connected with the arc guiding channel, and a plurality of arc suppression plates are

   formed between the second spraying nozzle, and wherein the arc suppression plate

   is provided with an opening connected with each arc suppression channel.
9. 9. A residual current circuit breaker with overcurrent protection according to claim 8,

   wherein a plurality of the second arc spraying nozzles are interlaced.

   Claims
10. 10. A residual current circuit breaker with overcurrent protection according to claim 9,

    wherein an arc discharge outlet is arranged on the side wall opposite the side wall

    where the housing and the first arc spraying nozzle, wherein the housing is provided

    with a mounting cavity for assembling the printed circuit board, wherein an arc baffle

    plate is arranged on the outer side of the side wall facing the top of the housing, and

    wherein the outer side of the arc baffle plate is coordinated with the inner wall of the

    housing to form the arc discharge channel for communicating the arc chamber and

    the arc discharge outlet.