GB679232A - Improvements in or relating to free tripping overload electric switches - Google Patents

Improvements in or relating to free tripping overload electric switches

Info

Publication number
GB679232A
GB679232A GB16034/50A GB1603450A GB679232A GB 679232 A GB679232 A GB 679232A GB 16034/50 A GB16034/50 A GB 16034/50A GB 1603450 A GB1603450 A GB 1603450A GB 679232 A GB679232 A GB 679232A
Authority
GB
United Kingdom
Prior art keywords
switch
lever
spring
contacts
moving
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB16034/50A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cutler Hammer Europe Ltd
Original Assignee
Igranic Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Igranic Electric Co Ltd filed Critical Igranic Electric Co Ltd
Publication of GB679232A publication Critical patent/GB679232A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/50Manual reset mechanisms which may be also used for manual release
    • H01H71/62Manual reset mechanisms which may be also used for manual release with means for preventing resetting while abnormal condition persists, e.g. loose handle arrangement
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/50Manual reset mechanisms which may be also used for manual release
    • H01H71/501Means for breaking welded contacts; Indicating contact welding or other malfunction of the circuit breaker
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/22Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release
    • H01H73/24Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release reset by lever

Landscapes

  • Breakers (AREA)

Abstract

679,232. Automatic circuit-breakers. IGRANIC ELECTRIC CO., Ltd. June 27, 1950. [June 27, 1949] No. 16034/50. Class 38 (v). A free-tripping, overload-responsive switch has a rectilinearly-movable element which when released moves the pivots of a contact-carrying switch member to open the contacts. The switch has a fixed contact 11 and a moving contact on the switch member 14 which is pivoted at 14a to the rectilinearly-movable element 15. The latter is biased downwardly by a spring 16 but is normally held in its uppermost position, Fig. 2, by a current-carrying bimetal strip 18, the free end of which engages a portion 15d of the element 15. The free end of the member 14 is connected by a snap-acting, over-centre spring 25 to an arm 23c on a toggle member 23 which is pivoted at 23b. The switch is closed by moving the operating lever 24 to the dottedline position, Fig. 2, the forked end 24a of the lever which engages a pin 28 on the member 23, turning the member 23 clockwise about its pivots 23b to move the arm 23c down to a position where the spring 25 snaps over-centre and causes the free end of the switch member 14 to move down to close the contacts. If an overload occurs, the bimetal strip distorts, releasing the element 15, which moves downwardly carrying with it the pivoted end of the member 14. The member 14 strikes against projections 10c on the walls of the switch housing 10, causing it to move into the tripped position, Fig. 3. The member 23 is now relieved of much of the tension of the spring 25, so that a light spring 29 is able to move the member 23 into the position of Fig. 3 where the lever 24 is in a central position indicating that the switch has tripped, and a projection 23d of the member 23 abuts the underside of an extension 15c of the element 15. To reset the switch, the lever 24 is restored to the "off" position shown in full lines in Fig. 2. This movement of the lever 24 turns the member 23 anticlockwise about its pivot 23b so that the projection 23d moves the element 15 up to the position where it is latched by the strip 18, the contacts remaining open during this operation. The projections 10c are so situated in relation to the pivots 14a in their lower position, that retention of the lever 24 in the "on" position does not prevent the tripping of the switch. The switch is opened manually by moving the lever 24 to its "off" position, so moving the spring 25 over-centre to open the contacts. The operating lever 24 may be provided with a dust boot 30. The bracket 18b supporting the bimetal strip 18 has an arm 18c engaged by a screw 21 for current-setting purposes.
GB16034/50A 1949-06-27 1950-06-27 Improvements in or relating to free tripping overload electric switches Expired GB679232A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US101601A US2556197A (en) 1949-06-27 1949-06-27 Free-tripping overload switch

Publications (1)

Publication Number Publication Date
GB679232A true GB679232A (en) 1952-09-17

Family

ID=22285503

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16034/50A Expired GB679232A (en) 1949-06-27 1950-06-27 Improvements in or relating to free tripping overload electric switches

Country Status (2)

Country Link
US (1) US2556197A (en)
GB (1) GB679232A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2753423A (en) * 1951-03-28 1956-07-03 Hairy Rene Eugene Arc suppressors for electric switchgear
US2811606A (en) * 1953-12-11 1957-10-29 Fed Electric Prod Co Automatic circuit breakers
TWM322054U (en) * 2007-05-18 2007-11-11 Tzan-Chi Chen Over-current protecting switch

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1726233A (en) * 1924-11-26 1929-08-27 Westinghouse Electric & Mfg Co Motor-starting switch
US2222209A (en) * 1938-12-08 1940-11-19 Gen Motors Corp Switch

Also Published As

Publication number Publication date
US2556197A (en) 1951-06-12

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