GB250260A - Improvements in and relating to thermal-responsive devices for use in electric relays and the like - Google Patents

Improvements in and relating to thermal-responsive devices for use in electric relays and the like

Info

Publication number
GB250260A
GB250260A GB8873/26A GB887326A GB250260A GB 250260 A GB250260 A GB 250260A GB 8873/26 A GB8873/26 A GB 8873/26A GB 887326 A GB887326 A GB 887326A GB 250260 A GB250260 A GB 250260A
Authority
GB
United Kingdom
Prior art keywords
strips
thermal
switch
bimetallic
coils
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
GB8873/26A
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 GB250260A publication Critical patent/GB250260A/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
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/36—Electromagnetic mechanisms frequency selective

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)

Abstract

250,260. British Thomson-Houston Co., Ltd., (Assignees of Hall, C. 1.). April 4, 1925, [Convention date]. Selective distant control systems. -Thermal switches are placed in tuned circuits so as to be operated by currents of a particular frequency only. The thermal switch is preferably a bimetallic one comprising brass and nickel steel strips which are heated mainly by the eddy current and hysteresis effect produced by the alternating current in a coil surrounding the strips. Fig. 2 shows two such bimetallic strips 10, 11 provided with coils 12, 13 and adapted to tip a mercury switch 15 into the " off " or " on " position according to which coil is energized. Additional bimetallic strips 21, 22 are also provided to compensate for variations of surrounding temperature. The arrangement is shown in a system for lighting lamps 37 &c. by means of a three-phase supply from a generator 29. The mercury switch 15 is operated to control the contactor switch 36 by superimposing on the mains by means of generators 30 or 33 alternating current of the requisite frequency to energize one or other of the tuned circuits containing the coils 12, 13.
GB8873/26A 1925-04-04 1926-04-01 Improvements in and relating to thermal-responsive devices for use in electric relays and the like Expired GB250260A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US250260XA 1925-04-04 1925-04-04

Publications (1)

Publication Number Publication Date
GB250260A true GB250260A (en) 1926-11-25

Family

ID=21823642

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8873/26A Expired GB250260A (en) 1925-04-04 1926-04-01 Improvements in and relating to thermal-responsive devices for use in electric relays and the like

Country Status (1)

Country Link
GB (1) GB250260A (en)

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