GB551848A - Improvements in and relating to electro-magnetic overload relays - Google Patents

Improvements in and relating to electro-magnetic overload relays

Info

Publication number
GB551848A
GB551848A GB7194/42A GB719442A GB551848A GB 551848 A GB551848 A GB 551848A GB 7194/42 A GB7194/42 A GB 7194/42A GB 719442 A GB719442 A GB 719442A GB 551848 A GB551848 A GB 551848A
Authority
GB
United Kingdom
Prior art keywords
winding
armature
overloads
electro
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
GB7194/42A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB551848A publication Critical patent/GB551848A/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
    • H01H71/142—Electrothermal mechanisms actuated due to change of magnetic permeability

Landscapes

  • Electromagnets (AREA)
  • Breakers (AREA)

Abstract

551,848. Electromagnets. BRITISH THOMSON HOUSTON CO., Ltd. May 27, 1942, No. 7194. Convention date, May 27, 1941. [Class 33] [Also in Group XXXVII] An overload relay which operates with an inverse-time characteristic for moderate overloads and instantaneously for big overloads has an energizing winding 14 of thermo-magnetic material which_ loses its permeability with rise of temperature caused by the flow of current. Thus, when cold the winding serves to shunt magnetic fiux-which would otherwise pass through the armature 12, but as the temperature rises more flux passes through the armature which is eventually attracted. The core tip 21 is preferably made hollow so that it becomes saturated more readily. The winding 14 may have a coating 14b,of copper.
GB7194/42A 1941-05-27 1942-05-27 Improvements in and relating to electro-magnetic overload relays Expired GB551848A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US551848XA 1941-05-27 1941-05-27

Publications (1)

Publication Number Publication Date
GB551848A true GB551848A (en) 1943-03-11

Family

ID=21996193

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7194/42A Expired GB551848A (en) 1941-05-27 1942-05-27 Improvements in and relating to electro-magnetic overload relays

Country Status (1)

Country Link
GB (1) GB551848A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2160362A (en) * 1984-06-13 1985-12-18 Bbc Brown Boveri & Cie Electromagnetic device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2160362A (en) * 1984-06-13 1985-12-18 Bbc Brown Boveri & Cie Electromagnetic device

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