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GB501885A - Improvements in, and connected with, thermally-tripped automatic circuit breakers and similar electrical switchgear - Google Patents

Improvements in, and connected with, thermally-tripped automatic circuit breakers and similar electrical switchgear

Info

Publication number
GB501885A
GB501885A GB18530/38A GB1853038A GB501885A GB 501885 A GB501885 A GB 501885A GB 18530/38 A GB18530/38 A GB 18530/38A GB 1853038 A GB1853038 A GB 1853038A GB 501885 A GB501885 A GB 501885A
Authority
GB
United Kingdom
Prior art keywords
bar
circuit
spring
tripped
thermally
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
GB18530/38A
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.)
JA Crabtree and Co Ltd
Original Assignee
JA Crabtree and 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 JA Crabtree and Co Ltd filed Critical JA Crabtree and Co Ltd
Publication of GB501885A publication Critical patent/GB501885A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/42—Induction-motor, induced-current, or electrodynamic release mechanisms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H53/00—Relays using the dynamo-electric effect, i.e. relays in which contacts are opened or closed due to relative movement of current-carrying conductor and magnetic field caused by force of interaction between them
    • H01H53/10—Induction relays, i.e. relays in which the interaction is between a magnetic field and current induced thereby in a conductor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
    • H01H83/22—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages
    • H01H83/223—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages with bimetal elements

Landscapes

  • Thermally Actuated Switches (AREA)
  • Breakers (AREA)

Abstract

501,885. Thermal switches. CRABTREE & CO., Ltd., J. A. (Schiele Industriewerke) Nov. 11, 1937, No. 18530/38. Divided out of 498,325. [Class 38 (v)] A thermal switch for a three-phase circuit comprises three bimetallic strips 2 mounted at their lower ends on a bar 3 slidable in the casing and biassed by a spring 9b against an adjustable stop 9. Also slidable in the casing is a bar 6 having a lug 6b engaging the end of a blade spring 8a which normally bridges a pair of terminals 7, 8 in a control circuit of an automatic circuit-breaker. Overload in one or more of the phases produces an excess current in the corresponding heating coil 4, causing one or more of the bimetallic strips 2 to bend to the right and by engaging one or more pins 6a to move bar 6 to the right to open the circuit. Movement of the bar may operate a catch to release the circuit breaker. In a modification, the spring 9b is omitted, the bar 3 floating until bending of the strips brings it against the stop 9.
GB18530/38A 1937-08-20 1937-11-11 Improvements in, and connected with, thermally-tripped automatic circuit breakers and similar electrical switchgear Expired GB501885A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2199477X 1937-08-20
DE221442X 1940-09-19

Publications (1)

Publication Number Publication Date
GB501885A true GB501885A (en) 1939-03-07

Family

ID=32070570

Family Applications (2)

Application Number Title Priority Date Filing Date
GB20009/37A Expired GB498325A (en) 1937-08-20 1937-07-20 Improvements in, or relating to, automatic circuit breakers and similar electrical switchgear
GB18530/38A Expired GB501885A (en) 1937-08-20 1937-11-11 Improvements in, and connected with, thermally-tripped automatic circuit breakers and similar electrical switchgear

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB20009/37A Expired GB498325A (en) 1937-08-20 1937-07-20 Improvements in, or relating to, automatic circuit breakers and similar electrical switchgear

Country Status (5)

Country Link
US (1) US2199477A (en)
BE (1) BE443183A (en)
CH (1) CH221442A (en)
FR (1) FR876543A (en)
GB (2) GB498325A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2532172A (en) * 1947-08-02 1950-11-28 Ega Electric Ltd Electric switch gear
US3792401A (en) * 1972-06-29 1974-02-12 Westinghouse Electric Corp Thermally responsive electrical device

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE975370C (en) * 1942-08-17 1961-11-16 Siemens Ag Bimetal relay for monitoring multi-phase consumers
GB624581A (en) * 1947-02-19 1949-06-13 Crabtree & Co Ltd J A Improvements in automatic circuit breakers having thermal overload release units
GB624957A (en) * 1947-07-17 1949-06-20 British Thomson Houston Co Ltd Improvements in and relating to current sensitive devices for the protection of polyphase circuits
US2581882A (en) * 1948-07-27 1952-01-08 Cutler Hammer Inc Device for protecting polyphase circuits
US2749407A (en) * 1953-10-15 1956-06-05 Electrical Apparatus Co Ltd Single phasing preventor
DE1034252B (en) * 1954-12-29 1958-07-17 Siemens Ag Thermal overcurrent relay, in particular protection relay against single-phase operation of motors
DE1025497B (en) * 1954-12-29 1958-03-06 Siemens Ag Thermal overcurrent relay, in particular protection relay against single-phase operation of motors
US2866035A (en) * 1955-02-17 1958-12-23 C T Electrical Controls Ltd Thermally operated electric switching mechanisms
GB846937A (en) * 1957-09-16 1960-09-07 Crabtree & Co Ltd J A Improvements in thermal overload protection devices for motor starting switches
US3161733A (en) * 1961-11-01 1964-12-15 Sylvania Electric Prod Capacitance shorting switch for electrical translating devices
US3315054A (en) * 1965-06-28 1967-04-18 Fed Pacific Electric Co Overload relay with snap-acting condition responsive switch
DE1614743B1 (en) * 1967-11-27 1970-09-24 Starkstrom Schaltgeraetefabrik Thermal relay

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2532172A (en) * 1947-08-02 1950-11-28 Ega Electric Ltd Electric switch gear
US3792401A (en) * 1972-06-29 1974-02-12 Westinghouse Electric Corp Thermally responsive electrical device

Also Published As

Publication number Publication date
GB498325A (en) 1939-01-06
BE443183A (en)
CH221442A (en) 1942-05-31
US2199477A (en) 1940-05-07
FR876543A (en) 1942-11-09

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