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GB502712A - Improvements in, or relating to, overload release units for automatic circuit breakers and similar electrical switchgear - Google Patents

Improvements in, or relating to, overload release units for automatic circuit breakers and similar electrical switchgear

Info

Publication number
GB502712A
GB502712A GB3263337A GB3263337A GB502712A GB 502712 A GB502712 A GB 502712A GB 3263337 A GB3263337 A GB 3263337A GB 3263337 A GB3263337 A GB 3263337A GB 502712 A GB502712 A GB 502712A
Authority
GB
United Kingdom
Prior art keywords
casing
thermal
circuit breakers
unit
relating
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
GB3263337A
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.)
SCHIELE INDUSTRIEWERKE
Original Assignee
SCHIELE INDUSTRIEWERKE
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 SCHIELE INDUSTRIEWERKE filed Critical SCHIELE INDUSTRIEWERKE
Priority to GB3263337A priority Critical patent/GB502712A/en
Publication of GB502712A publication Critical patent/GB502712A/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
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element

Landscapes

  • Breakers (AREA)

Abstract

502,712. Thermal switches. CRABTREE & CO., Ltd., J. A. (Schiele Industriewerke) Nov. 26, 1937, No. 32633. [Class 38 (v)] A thermal overload release unit for automatic circuit breakers is mounted in a cylindrical casing having annular hollow walls providing heat insulation. As shown, a bimetal strip 1, Fig. 1, connected in a controlled circuit by loads a and adapted upon overload to close a tripping circuit through a contact 2a is mounted in a casing comprising concentric cylinders 3, 4 supported by removable plugs 3a, 4a to form heat insulating spaces A, A', which may be evacuated or filled with heat insulating material. In a modification, the unit is made detachable, and the bimetal strip 1, Fig. 4, heated by a coil 7 in the controlled circuit co-operates with a contact 2a carried by a non-thermal springy strip 2, the response of the unit being varied by rotating an eccentric 5 to alter the separation of the contacts 1a, 2a, through a screw 5a, the setting being indicated by graduations on a loading spring 6 read against a mark on the casing.
GB3263337A 1937-11-26 1937-11-26 Improvements in, or relating to, overload release units for automatic circuit breakers and similar electrical switchgear Expired GB502712A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3263337A GB502712A (en) 1937-11-26 1937-11-26 Improvements in, or relating to, overload release units for automatic circuit breakers and similar electrical switchgear

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3263337A GB502712A (en) 1937-11-26 1937-11-26 Improvements in, or relating to, overload release units for automatic circuit breakers and similar electrical switchgear

Publications (1)

Publication Number Publication Date
GB502712A true GB502712A (en) 1939-03-23

Family

ID=10341670

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3263337A Expired GB502712A (en) 1937-11-26 1937-11-26 Improvements in, or relating to, overload release units for automatic circuit breakers and similar electrical switchgear

Country Status (1)

Country Link
GB (1) GB502712A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2748222A (en) * 1953-08-11 1956-05-29 Lancey Ralph W De Thermal switches
EP0062082A1 (en) * 1981-04-03 1982-10-13 Pai I. Kuo Heat-sensitive safety resistor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2748222A (en) * 1953-08-11 1956-05-29 Lancey Ralph W De Thermal switches
EP0062082A1 (en) * 1981-04-03 1982-10-13 Pai I. Kuo Heat-sensitive safety resistor

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