GB419390A - Improvements relating to electric circuit controlling devices of the thermal type - Google Patents

Improvements relating to electric circuit controlling devices of the thermal type

Info

Publication number
GB419390A
GB419390A GB1734733A GB1734733A GB419390A GB 419390 A GB419390 A GB 419390A GB 1734733 A GB1734733 A GB 1734733A GB 1734733 A GB1734733 A GB 1734733A GB 419390 A GB419390 A GB 419390A
Authority
GB
United Kingdom
Prior art keywords
thermal
switches
electric circuit
improvements relating
circuit controlling
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
GB1734733A
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.)
J G Smithson & Co Ltd
Original Assignee
J G Smithson & 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 J G Smithson & Co Ltd filed Critical J G Smithson & Co Ltd
Priority to GB1734733A priority Critical patent/GB419390A/en
Publication of GB419390A publication Critical patent/GB419390A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/64—Contacts
    • H01H37/66—Magnetic reinforcement of contact pressure; Magnet causing snap action

Landscapes

  • Thermally Actuated Switches (AREA)

Abstract

419,390. Thermal switches; partly electromagnetic switches. SMITHSON & CO., Ltd., J. G., and SMITHSON, J. G., Nelson House, Moor Street, Birmingham. June 17, 1933, No. 17347. [Class 38 (v).] In thermallyoperated overload switches, the heating coil for the thermal member serves also as a magnetizing coil adapted to produce a magnetic effect supplementing the thermal effect and causing a rapid actuation of the switch on an extreme overload. In the form shown, the bimetallic strip a carries an armature c and contact d and is heated by a coil g which serves also to magnetize a strip f that attracts the armature. The bimetallic strip may be curved in section as described in Specification 419,085 so as to move with a snap-action.
GB1734733A 1933-06-17 1933-06-17 Improvements relating to electric circuit controlling devices of the thermal type Expired GB419390A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1734733A GB419390A (en) 1933-06-17 1933-06-17 Improvements relating to electric circuit controlling devices of the thermal type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1734733A GB419390A (en) 1933-06-17 1933-06-17 Improvements relating to electric circuit controlling devices of the thermal type

Publications (1)

Publication Number Publication Date
GB419390A true GB419390A (en) 1934-11-12

Family

ID=10093578

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1734733A Expired GB419390A (en) 1933-06-17 1933-06-17 Improvements relating to electric circuit controlling devices of the thermal type

Country Status (1)

Country Link
GB (1) GB419390A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5107235A (en) * 1991-01-24 1992-04-21 Square D Company Current driven actuator with coupled thermal and magnetic actuating elements

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5107235A (en) * 1991-01-24 1992-04-21 Square D Company Current driven actuator with coupled thermal and magnetic actuating elements

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