GB2271883A

GB2271883A - Electrical plug having a circuit breaker

Info

Publication number: GB2271883A
Application number: GB9309208A
Authority: GB
Inventors: Hiroyuki Nagano
Original assignee: Hosiden Corp
Current assignee: Hosiden Corp
Priority date: 1992-10-15
Filing date: 1993-05-05
Publication date: 1994-04-27
Anticipated expiration: 2013-05-05
Also published as: JP2590760Y2; JPH0636186U; AU3306793A; AU653464B2; GB2271883B; HK1008122A1; GB9309208D0

Abstract

An electrical plug which can instantaneously break a current supply in response to a detection a current leak comprises a current supply cord (200) connected to three plug blades (500a, 500b, 500c), a leak detection sensor (300) for detecting a current leak and, a circuit breaker device for breaking the connection between two plug blades (500a, 500b) and the current supply cord (200) in response to a detection by the sensor (300). The circuit breaker device comprises a pair of movable contact strips (410) each having one end fixed to the plug body and another free end (411), a pair of stationary contacts (420) connected to the two plug blades (500a, 500b); a holder (430) connecting the pair of free ends (413) of the movable contact strips (410), a lifter (440) for pulling the holder (430) such that the movable contact strips (410) contact the stationary contacts (420), a solenoid (450) actuable in response to a detection by the leak detection sensor (300) to cause its plunger (460) to be pulled in so as to disengage the lifter (440) from the holder (430). The supply cord (200) is connected to the movable contact strips (410) via terminal plates (210a, 210b) which pass through the leak detention sensor (300). <IMAGE>

Description

SPECIFICATION TITLE OF THE INVENTION ELECTRICAL CONNECTOR PLUG WITH BREAKER FUNCTION FIELD OF THE INVENTION This invention relates to an electrical connector plug with the function of instantaneous breaking of a current in response to a detection of current leak, for use in the twophase three-wire system.

DESCRIPTION OF THE RELATED ART The inventors of this application have filed two prior inventions in this art: Japanese Utility Model (UM) Application H1-343969, and Japanese UM Application H2-85315. However, in the preceding art, there have been found the disadvantage that so many parts are involved and thus much 3abor cost is required for assembly, and that a current supply cord is laid to run through a sensor for detecting a leak current so that a slight dislocation including a distortion or loosening of the cord causes undesirable erroneous magnetism and in turn invites occasional malfunctions.

This invention has been attained to overcome the drawbacks found with the preceding art so that the assembly work maybe implemented with use of fewer number of parts and that any malfunction due to the current supply cord may be avoided.

SUMMARY OF THE INVENTION This invention includes as a part an electrical connector plug for use in two-phase three-wire system with a breaker function, the plug comprises a current supply cord which will connect to a load, two plug blades which will connect to a source outlet and, internally of the plug, the blades connect the conduction to the current supply cord, a leak detection sensor in a ring for detecting a current ]eak, breaker device for breaking the connection between the plug blades and the current supply cord in response to a detection by the sensor.

The breaker device comprises a pair of movable strips each having one end fixed to the plug body and another end made free, a pair of stationary strips connected to the plug blades, a holder which connects the pair of the free ends of movable strips, a lifter for pulling the holder such that the movable strips will contact the stationary strips, a solenoid for being excited in response to a detection by the leak detection sensor, a plunger for disengaging the lifter from the holder by the plunger's being pulled into the solenoid excited.

The connector plug may further comprise a reset device which comprises a reset switch connected to the lifter pivotable about a shaft provided with the reset switch, a spring which biases the reset switch such that the movable strips tend to contact the stationary strips, whereby a push of the reset switch will engage a lifter nail with a holder nail and in turn pull the movable strips toward the stationary strips to be contacted each other.

This invention includes as another aspect an electrical connector plug for use in two-phase three-wire system with a breaker function. The connector plug comprises a current supply cord which will connect to a load, two plug blades which will connect to a source outlet and, internal]y of the plug, the blades connect to the current supply cord, a leak detection sensor for detecting a current leak, a breaker device for breaking the connection between the plug blades and the current supply cord in response to a detection by the sensor, the current supply cord which is connected to the movable strips with intermediate aid of a pair of terminal plates made of metal, the terminal plates which is set to run through the leak detection sensor in a ring form and is fixed by an upper body half and a first lower body half.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective exploded view of an embodiment of the inventive plug.

Fig. 2 is a plan view of the embodiment as shown in Fig. 1.

Fig. 3 is a bottom view (or view from under) of the first lower body half (left part) coupled with the upper body half (right part, see Fig. 15 (A), right portion) in the absence of a second lower half of the plug body (or the second lower half is uncoupled).

Fig. 4 is a vertical section of the embodiment.

Fig. 5 is a plan view of a first lower half of the plug body.

Fig. 6 is a side view of the movable strip.

Fig. 7 is a plan view of the stationary strip.

Fig. 8 is a side view of the stationary strip.

Fig. 9 relates to views of the holder, wherein Fig. 9 (A) is a plan view and Fig. 9 (B) is a side view.

Fig. 10 relates to views of the lifter, wherein Fig. 10 (A) is a front view and Fig. 10 (B) is a side vi.ew.

Fig. 11 is a vertical view of the reset switch with half cut into section.

Fig. 12 relates to views of the base, wherein Fig. 12 (A) is a plan view and Fig. 12 (B) is a side view.

Fig. 13 is a vertical section of the test switch.

Fig. 14 shows perspective views of the terminal p]ates.

Fig. 15 relates to an upper half of the plug body, wherein Fig. 15 (A) is a bottom view of the upper body half and Fig.

15 (B) is a sectional view taken along the line A-A in Fig.

15 (A).

Fig. 16 is a schematic view useful to explain the breaker mechanism.

These drawings are presented for illustrating an embodiment of the present invention and therefore these should not be construed as limiting the invention.

In the following, the present invention will be described with reference to the drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENT(S) OF TilE PRESENT INVENTION An embodiment to be described herein is an electrical connector plug for use to connect an outlet socket in the twophase three-wire system, with the function of instantaneously breaking a current in response to detection of a leak, wherein the inventive embodiment is provided with a breaking mechanism which comprises: three pieces of plug blades bOOa, 500b, 500c (input to the plug) projecting out of a plug body 100 and being electrically connected to a current supply cord 200 (output from the plug); a leak detection sensor 300 mounted in the plug body 100 for detecting a leak current; a breaker device for breaking the connection between the two plug blades 500a, 500b, these two having been connected to the current source, and the current supply cord 200 in response to a detection by the leak detection sensor 300, in summary.

The breaker device as noted comprises: a pair of movable strips 410 each having an end portion thereoi fixed to the plug body 100; a pair of stationary strips 420 connected to the two source-connected plug blades 500a, 500b; a holder 430 attached to free ends 411 of the paired movable strips 410, a lifter 440 for pulling the holder 430 such that the movable strips 420 are made contactual-with the stationary strips 420 in resistance to a spring action; a solenoid 450 for being excited in response to a detection by the leak detection sensor 300; a plunger 460 having a head 461 engaged with the lifter 440 for disengaging the engagement between the lifter 440 and the holder 430 by a move in response to excitement of the solenoid 450.

The connecter device further comprises a reset device which comprises a reset switch 470 connected to the liter 440; a spring 480 for biasing the reset switch 470 such that the movable strips 410 tend to contact the stationary strips 420; therein the lifter 440 being pivotable about a shaft 474 provided with the reset switch 470. Thereby a push of the reset switch 470 will engage a nail 441a of the liter leg 441 with an engageable mating portion 431 of the holder 430 and in turn the movable strips 410 is pulled toward the stationary strips 420 to be contactual with thereof.

Then, the plug body 100 generally comprises an upper body half 120 and two lower body halves 110, 130, wherein the upper body half 120 has an area to fit with the first and second lower body halves 110, 130 together. Specifically, the plug body 100 is divided into a first lower body half 110 on which devices including the breaker device are mounted, the upper body half 120 which provides an electronic circuit board and a terminal part 120a for connecting the current supply cord 200 with the breaker device and related devices, and the second lower body half which works mainly as an under cover to enclose the area for the terminal part provided with the upper body half 120, as is seen in Figs. 1 and 3 (Therefore, the second lower body half 130 is fitted with the upper body half 120 so that a user can remove the second lower body half 130 without difficulty, as will be apparent later).

The first lower body half 110 has one end portion formed, as seen in Fig. 1, with a rectangular corner and has the other end portion formed with a round corner, wherein the round corner defines a round downward stub 116 which forms a bottom face (not shown) to meet a socket to be connected in use. As Fig. 5 shows, this first lower body hali 110 is provided with a solenoid mount 1.11 on which a solenoid 450 comprised in the breaker device is rested, and with a sensor mount 112 on which a leak detection sensor 300 is mounted, and further with a pair of movable strip mounts 113 on which one end of each movable strip 410 is fixed, and sti1.3. further with terminal plate mounts 114 on which three terminal.

plates 210a, 210b, 2210c are fitted.

As is seen from Figs. 4 and 5, three openings 135a, llbb, 115c for the plug blades 500a, 500b, 500c to be inserted are provided with the stub portion 116 of the first lower body half 110, wherein the two openings 115a, 115b for the plug blades 500a, 500b which are connected to the source are positioned like two sides of an equilateral. triangle and the opening 115c for the plug blade 500c is positioned inbetween to be longitudinal. The plug blades 500a, 500h are for conduction of the current and the remnant SOOc is for grounding, wherein the blade 500c is a little longer than the other two.And each blade 500a, 500b, 500c has a clamp- ing side convex 510a, 510b, 510c (see Fig. 3) at each base portion, by wJicJ eache blade will 2;m sturdy fixation when inserted through the opening.

In addition, the first lower body half 110 has paired clamping nails 118 for coupling to the upper body half 120. See Figs. 1 and 5.

As Figs. 1, 2, and 5 show, the upper body half 120 is pro- vided with two ellipsoidal openings 121, 122. That is, one 121 is for view of the word 'sRESET", and the other 122 is for view of the word "TEST". The reset opening 21 is locat- ed to be above the plug blade openings 115, and the test switch opening 122 is located to be above the terminal part 120a of the upper body half 120, the terminal part 120a being provided with the under face thereof. Further, as Fig.

15 shows, the under face of the upper body half 120 is provided with a lateral ridge 123 for pressing terminal plates 210a, 210b, 210c and longitudinal ridges 124 for fitting into correspondent longitudinal recesses 117 provided between the terminal plates 210a, 210b, 210c (see Fig.

5).

In addition, the second lower body half 130 is coupl.ed with the upper body half 120 by screw bolts 131 (see Fig. 3) to enclose the terminal part 120a on the upper body half 120.

The terminal plate mount 114 of the first lower body half 110 is present on the wall of the rectangular corner of the first lower body half 110 (see Fig. 5). Specifically, the terminal plate mount 114 comprises three terminal plate mounts 114a, 114b, 114c to mount the three terminal plates 210a, 210b, 210c (see Figs. j and 14) and our longitudinal recesses 117 which are formed at both sides ot the terminal plate mounts 114a, 114b, 114c. The four longitudinal recesses 117 are prepared for fitting to four longitudinal ridges 124 provided on the upper body half 120 (see Fig. 35).That is, when the upper body half 120 is coupled with the I iirst lower body half 110, the terminal plates 2goy, 2gOb, 230c are pressed vertically by both the upper body half 120 and the first lower body half 110, wherein each terminal plate 210a, 210b, 210c is mounted in each mount 134a, 114b, 114c and pressed from upper by the lateral ridge 123 and the longitudinal recesses 117 are received with the longitudinal ridges 124 which will prevent the short circuit of the current supply cord 200 in this mount 114.

The three terminal plates 210 include the two terminal plates 210a, 210b, arranged at the two sides, which connect to the plug blades 500a, 500b and the one terminal plate 500c, arranged at the center, which connects to the grounding plug blade 500c. As Fig. 14 indicates, these three terminal plates 210a, 210b, 210c are manufactured by blanking the hard metal sheet into crank-like shapes. At one end portion thereof (right side in view), a nail hole 211a, 211b, 211c is each provided for clamping by the screw bolt 214.

Referring to the terminal plates 210a, 210b, located at the sides, which will connect to the movable strips 430, these two plates 210a, 210b are designed to have a normally flexed, like an angular C letter flatly, middle portion 212a, 212b so as to insert through the leak detection sensor 300 in a ring form. And the nail holes 211a, 211b (right in view) each will be clamped by the screw bolts to connect the current supply cord 200 and the two hole ending portion having two nail holes 213a, 213b, located at the opposite ends (left in view), will be used to make connections, wherein the two holes 213a, 213b are provided: one is for connection to the movable strip 410 and the other is for fixing on the movable strip mount 113 in the first lower body half 110.

As for the terminal plate 210c located at the center, this plate does not have interference with the leak detection sensor 300 and is directly connected to the plug blade 500c for the grounding, wherein at one end (left in view), a square hole 213c is provided to engage with the plug blade 500c.

Now the description proceeds to the breaker device and parts involved therein.

As Fig. 6 shows, each movable strip 410 is made from a thin metal plate to have one end portion 413 lifted up and a middle portion 415 vertically bent stepwise (This step height portion will meet one end portion 233a or 213b of the terminal plate 210a or 210b to make a connection by overlap ping), and a free end portion 433. (left in view), wherein the lifted portion 413 will connect electronic circuits provided on a printed circuit board 600 which will be described later, and the free end portion 431 is provided with a nail hole 412 at which a movable contact 4j4 (see Fig. 1) will be mounted and the middle portion 415 is provided with a nail hole 416 which will be used to attach the terminal plate 210a or 210b.

The paired stationary strips 420 are made from a thin metal plate and shaped to be symmetrical each other when disposed in place (see Fig. 1). As Figs. 7 and 8 show, each stationary strip 420 has a flat portion 421 for mounting either of the two plug blades 500a, 500b and has a contact portion 422 which integrally lifts up and bends above the portion 421 like an angular C letter, wherein the flat or plug blade mounting portion 421 is provided with a slot for insertion of the plug blade 500a or 500b, and the contact portion 422 is provided with a nail hole 422a which will be mounted with a stationary contact 423 (see Fig. 1).Further, each sty tionary strip 420 has a projecting portion 424, which will be connected to the other projecting portion 4%4 of the paring stationary strip 420 by a varistor 800 (see Fig.

4).

The terminal plates 210a, 210b and the movable strips 410, and the stationary strips 420 are assembled in the breaker device as shown in Fig. 16, wherein the terminal plate 210 is connected to the movable strip 410 and its free end mounted with the movable contact 414 is positioned inside a space formed by the contact portion 422 (in Fig. 16, the wall is abbreviated) to stay in free state without contact to the stationary contact 423 which is located above the movable contact 414, and this non-contact state is kept while no magnetic effect affects to the breaker device.

The holder 430 is made from an insulative plastic and is attached to the paired free ends 411 of the movable strips 410. As Fig. 9 shows, the holder 430 has mounts 432 -at two opposite ends for each mounting the free end 4g1 oi the movable strip 410, wherein in the mounting, the holder ends 432 (electrically insulative) positionally come under the strip ends 411 and thereby the strip ends 411 (eZectri- cally conductive) will not contact the flat portion 421 of the stationary strip 420 (electrically conductive). TheS, the holder 430 has two transversal nails 43 or engaging mates inclining downward which will engage with nails 441a of the lifter 440 as will be apparent later.

As Figs. 10 (A) and 10 (B) show, the lifter 440 has yeneral- ly an H-letter shape (see Fig. 10 (B)): two raised hands 442 and two legs 441. Each hand 442 has a hole 442a and each leg 441 has a forwardly projecting nail 441a. This nail 441a will engage with the nail 431 of the holder 430 to raise up the holder 430 upward and thus the free end 413 of the movable strip 410 upward to contact the movable contact 414 with the stationary contact 423. As for the function of the hole 442a, the description will appear later.

As Fig. 11 shows, the reset switch 470 has a press portion 471, of which top face is marked "RESET" as is shown in Fig.

2, and this part 471 will. project slightly out of the reset switch opening 121 provided with the first upper body halt 120 and a pair of legs 472 which extend from the upper portion 471. Inside the press portion 471, a protrusion 473 is formed downward, and on outward side of the each leg 472, a round butt shaft 474 is formed so as to engage with the hole 442a of the lifter 440 and thereby the liter 440 is connected to or mounted on the reset switch 470 with enablement of a pivotal movement about the butt shaft 474.

And a coil spring 480 (see Fig. 1) is interJacently placed between the reset switch 470 (specifically between the paired legs 472) and the printed circuit board 600 (see Fiy.

1) so that the reset switch 470 is biased upward and i.n turn the movable strip 410 (movable contact 41.4) is constantly biased to contact the stationary strip 420 (stationary contact 423).

The solenoid 450 is designed to get excited the moment that as the leak detection sensor 300 senses a leak. Once the solenoid 450 is excited, a plunger 460 is attracted into the solenoid 450 in resistance to biasing force oi a spring 462 (see Figs. 1 and 4), wherein the head 461 of the plunger 460 has been engaged with the two legs 441 of the lifter 440 and thereby a pull move of the plunger 460 into the solenoid 450 causes the lifter 440 to make a pivotal. move (about the butt shaft 474) toward the solenoid 450 and further actions will be described later.

The solenoid 450 as noted is mounted on a base as as 490, shown in Fig. 12, and rested in the solenoid mount Ill of the first lower body half 110. On the upper side of the base 490, formed are a pair of corner walls 491 for resting the solenoid 450 and a pair of shouldered columns 492 for spacing to the level of the pri.nted circuit board 600. The base 490 is designed to have a size and shape to cover a part of the flat portion 421 of the stationary strip 420 when the base 490 is mounted on the solenoid mount 111.

The terminal plates 210a, 210b are mounted on the terminal plate mounts 114a, 114b so as to run through the sensor 300 for detecting a leak current shaped in a ring and rested on the sensor device mount 112 (see Fig. 5, and in Fig. 1, two terminal plates 210a, 210b are drawn at staggered positions, but as is understood by Fig. 5 or others, these two 210a, 21Db are placed symmetrical with respect to the longitudinal.

length of the body 110).

The leak detection sensor 300 is the type of a current sensor to detect magnetism to be caused by a leak current.

When this sensor 300 detects any magnetism, a signal will. go to circuits (not shown) comprised in the printed circuits carried on the board 600. And when the sensor 300 is mounted on the mount 112 of the first lower body half 130, some space is kept between the bottom of the sensor 300 and the surface of the first lower body half 110, wherein the third terminal plate 230c is laid to run through. The printed circuit board 600 (see Fig. 1.) is provided with a pair of a pair of openings 610 which the legs 472 of the reset switch 470 run through and the other two openings a guide pin 720 and a rod 710 of the test switch 700 run through as will be described later.

Turning to reference to the test device which comprises the test switch 700 shown in Figs. 1. and 13, this test. switch 700, marked with "TEST" on its top face, is intended to test the inventive plug if it works to break a current instantaneously as desired in response to an occurrence of a leak current. The test switch 700 comprises the rod 730 which connects the terminal plates 210 to the circuits on the board 600, the guide pin 720 which will guide a vertical action of the test switch 700, and a spring 730 which biases the rod 710 to be away from contacting the circuits, wherein the rod 710 is fixed by being engaged into a recess 703 formed on the underside of the switch 700.And the test switch 700 is mounted with the spring 730, in which state the guide pin 720 and the leg 730 are designed to run through the holes 620 provided with the board 600 so that some circuits on the board 600 will cause the excitement of the solenoid 450 comparably as a true current leak occurs.

The operation of the inventive plug is described i.n the following.

A press of the reset switch 470 causes the nails 441a of the lifter 440 to engage with the engaging mates 433 of the holder 4430, and thus to raise up the paired movable strips 410 to make the movable contact 414 contact the stationary contact 423. In this state, the current supply cord 200 is electrically conductive through the plug devices to the plug blades 500a, 500b, wherein the cord 200 is connected to the terminal plates 210a, 210b, in turn, to the movable strips 410, the stationary strips 420 down to the plug blades 500.

The plug is applied to the working with this state.

Assume that, by any cause, the leak detection sensor 300 senses an occurrence of some magnetism around the cord which is derived from a leak current, the solenoid 450 is excited to attract the plunger 460 into the solenoid 450. Thereby the plunger head 461 pulls the lifter toward the solenoid 450, by which action the lifter pivots to a tilt position, and in turn, the connection between the liter nail 44 and the holder's nail 431 breaks, that is, the conduction breaks, and then, the lifter 440 pivots up further by action of the spring 480 which biases upward. The breaking causes the movable contact 414 of the movable strips 410 comes to be away from the stationary contact 423 to keep the state as shown in Fig. 16. Thus the current supply is suspended.

If a press of the reset switch 470 takes place to engage the lifter 440 with the holder 430 while the cause for the current leak is not yet extinguished, a contact between the movable contact 414 and the stationary contact 423 may reform, but instantaneously the same breaking sequences occur and the current is broken as a result.

A user is permitted to check if the normal. breaking takes place by a press of the test switch 700. A press of the test switch 700 causes, by a move of the rod 710, a connection of the terminal plates 210 to the circuits and thereby the solenoid 450 is excited intentionally and in turn the contact between the movable contact 414 and the stationary 423 is broken.

In handling the inventive plug, a user is permitted to apply the plug to any desired load, for instance, a hair dryer.

Therein, the user is requested to remove the second lower body half or under cover 130 from the assembly, as shown in Fig. 3, to expose the terminal part 120a and to connect these three terminals (N, E, A in Figs. 3 and 153 to the desired load.

While there have been described what is at present cons id- ered to be the preferred embodiment of the invention, it will be understood that various modifications may be made therein, and it is intended to cover in the appended claims all such modifications as fall. within the true spirit, and scope of the invention.

Claims

What is claimed is:

1. An electrical connector plug for use in two-phase three wire system with a breaker function, which comprises: a current supply cord (200) to connect to a load; three plug blades (500a, 500b, 500c) to connect to a source outlet and internally of the plug, connecting to the current supply cord (200); a leak detection sensor (300) for detecting a current leak; a breaker device for breaking the connection between the two plug blades (500a, 500b) of the three plug blades (500a, 500b, 500c) and the current supply cord (200) in response to a detection by the sensor (300); said breaker device comprising: a pair of movable strips (410) each having one end (413) fixed to the plug body and another end (411) made free; a pair of stationary strips (420) connected to the plug blades (500a, 500b); a holder (430) connecting the pair of the free ends (413) of movable strips (410); a lifter (440) for pulling the holder (430) such that the movable strips (410) contact the stationary strips (420); a solenoid (450) for being excited in response to a detection by the leak detection sensor (300); a plunger (460) for disengaging the lifter (440) from the holder (430) by the plunger's being pulled into the solenoid (450) excit- ed,

2.An electrical connector plug as claimed in c]aim 1, wherein said connector plug further comprises a reset device which comprises: a reset switch (470) connected to the lifter (440) pivotable about a shaft (474) provided with the reset switch (470); a spring (480) biasing the reset switch (470) such that the movable strips (410) tend to contact the stationary strips (420); whereby a push of the reset switch (470) engaging a lifter nail (441a) with a holder nail (431) and in turn pulling the movable strips (410) toward the stationary strips (420) to be contactual each other.

3. An electrical connector substantially as described herein with reference to the accompanying drawings.

3. An electrical connector plug as claimed in claim 1, said connector plug comprising: a current supply cord (200) to connect to a load; three plug blades (500a, 500b) to connect to a source outlet and internally of the plug, connecting to the current supply cord (200); a leak detection sensor (300) for detecting a current leak; a breaker device for breaking the connection between the two plug blades (SODa, 500b) of the three plug blades (500a, 500b, 500c) and the current supply cord (200) in response to a detecti.on by the sensor (300); wherein the current supply cord (200) is connected to the movable strips (410) with intermediate aid oi a pair of terminal plates (210a, 210b) made of metal, the terminal plates (210a, 210b) are set to run through the leak detection sensor (300) in a ring form and fixed by an upper body half (120) and a first lower body half (ill0).

4. An electrical connector plug for use in two-phase three-wire system with a breaker function, the connector plug comprising a current supply cord which will connect to a load, two plug blades which will connect to a source outlet and, internally of the plug, the blades connect to the current supply cord, a leak detection sensor for detecting a current leak, a breaker device for breaking the connection between the plug blades and the current supply cord in response to a detection by the sensor, the current supply cord which is connected to the movable strips with intermediate aid of a pair of terminal plates made of metal, the terminal plates which is set to run through the leak detection sensor in a ring form and is fixed by an upper body half and a first lower body half.

5. An electrical connector substantially as described herein with reference to the accompanying drawings.

Amendments to the claims have been filed as follows: What is claimed is:

1. An electrical connector plug for use in two-phase three wire system with a breaker function, which comprises: a current supply cord (200) to connect to a load; three plug blades (500a, 500b, 500c) to connect to a source outlet and internally of said plug, connecting to said current supply cord (200); a leak detection sensor (300) for detecting a current leak; a breaker device for breaking the connection between said two plug blades (500a, 500b) of the three plug blades (500a, 500b, 500c) and said current supply cord (200) in response to a detection by said sensor (300); said breaker device comprising: a pair of movable strips (410) each having one end (413) fixed to said plug body and another end (411) made free; a pair of stationary strips (420) connected to said plug blades (500a, 500b); a holder (430) connecting said pair of the free ends (411) of movable strips (410); a lifter (440) for pullingsaid holder (430) such that the movable strips (430) contact the stationary strips (420); a solenoid (450) for being excited in response to a detection by the leak detection sensor (300); a plunger (460) for disengaging the lifter (440) from the holder (430) in response to excitement of the solenoid (450); a reset switch (470) connected to said lifter (440) pivotable about a shaft (474) provided with said reset switch (470); a spring (480) biasing said reset switch (470) such that the movable strips (410) tend to contact the stationary strips (420); whereby a push of said reset switch (470) causes a lifter nail (441a) to engage with a holder nail (431) which in turn pulls said movable strips (410) toward said stationary strips (420) until they touch.

2. An electric3 connector plug as c]aimed in claim 1 , Caid connector plug comprising: a current supply cord (200) to connect to a load; three plug blades (500a, 50dub) to connect to a source outlet and internally of the plug, connecting to the current supply cord (200); a leak detection sensor (300) for detecting a current leak; a breaker device for breaking the connection between the two plug blades (500a, 50dub) of the three plug blades (500a, 500b, 500c) and thc current supply cord (200) in response to a detection hy the sensor (300); wherein the current supply cord (200) is connected to the movable strips (410) with intermediate aid of a pair of terminal plates (210a, 210b) made of metal1 the terminal plates (210a, 21dub) are set to run through the leak detection sensor (300) in a ring form and fixed by an upper body half (120) and a first lower body half (110).