GB737320A - Improvements in the electrically operated time delay overload-responsive devices - Google Patents

Improvements in the electrically operated time delay overload-responsive devices

Info

Publication number
GB737320A
GB737320A GB3036952A GB3036952A GB737320A GB 737320 A GB737320 A GB 737320A GB 3036952 A GB3036952 A GB 3036952A GB 3036952 A GB3036952 A GB 3036952A GB 737320 A GB737320 A GB 737320A
Authority
GB
United Kingdom
Prior art keywords
coil
force
armature
overload
holding force
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
GB3036952A
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.)
Foster Transformers Ltd
Original Assignee
Foster Transformers 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 Foster Transformers Ltd filed Critical Foster Transformers Ltd
Priority to GB3036952A priority Critical patent/GB737320A/en
Publication of GB737320A publication Critical patent/GB737320A/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
    • H01H71/44—Automatic release mechanisms with or without manual release having means for introducing a predetermined time delay

Landscapes

  • Breakers (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

737,320. Electrically-tripped switches; electromagnetic switches. FOSTER TRANSFORMERS, Ltd., and BAGNALL, R. I. Dec. 1, 1953 [Dec. 1, 1952], No. 30369/52. Class 38 (5). A time-delay overload trip device, particularly for a circuit-breaker, comprises an armature 7 having a pivot mounting on a rod or sphere 6, and an insulated soft iron core 4 on which are wound a hold-on coil 11 and a pull-off coil 12 having more turns than the coil 11 but being of the same metal, the coils being connected in parallel in the load circuit. Under normal load, the armature is biased against a non-magnetic stop 10 by a total holding force comprising a constant force due to a weight 9 (or a spring) and the force due to coil 11, the total force being greater than that due to coil 12. Under overload,'the resistance of coil 11 will increase relatively more rapidly than that of coil 12 due to more current through the former coil and subsequent increased heating of this coil, the pull-off force will finally exceed the total holding force, and the armature will pivot. In the case of a heavy sudden overload the coil 12 will at once overcome the total holding force independently of heating effects. Specification 680,336 is referred to.
GB3036952A 1952-12-01 1952-12-01 Improvements in the electrically operated time delay overload-responsive devices Expired GB737320A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3036952A GB737320A (en) 1952-12-01 1952-12-01 Improvements in the electrically operated time delay overload-responsive devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3036952A GB737320A (en) 1952-12-01 1952-12-01 Improvements in the electrically operated time delay overload-responsive devices

Publications (1)

Publication Number Publication Date
GB737320A true GB737320A (en) 1955-09-21

Family

ID=10306578

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3036952A Expired GB737320A (en) 1952-12-01 1952-12-01 Improvements in the electrically operated time delay overload-responsive devices

Country Status (1)

Country Link
GB (1) GB737320A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2375712A1 (en) * 1976-12-22 1978-07-21 Bbc Brown Boveri & Cie THERMAL DELAY TRIP DEVICE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2375712A1 (en) * 1976-12-22 1978-07-21 Bbc Brown Boveri & Cie THERMAL DELAY TRIP DEVICE

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