GB612803A - Improvements in or relating to automatic thermomagnetic control - Google Patents

Improvements in or relating to automatic thermomagnetic control

Info

Publication number
GB612803A
GB612803A GB13308/47A GB1330847A GB612803A GB 612803 A GB612803 A GB 612803A GB 13308/47 A GB13308/47 A GB 13308/47A GB 1330847 A GB1330847 A GB 1330847A GB 612803 A GB612803 A GB 612803A
Authority
GB
United Kingdom
Prior art keywords
contacts
armature
resistances
engage
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
GB13308/47A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB612803A publication Critical patent/GB612803A/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
    • H01H37/32—Thermally-sensitive members
    • H01H37/58—Thermally-sensitive members actuated due to thermally controlled change of magnetic permeability

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

612,803. Magnetic switches. VALENSI, G. May 17, 1947, No. 13308. Convention date, June 20, 1946. Addition to 612,802. [Class 38 (v)] In an arrangement for protecting transmission lines in signalling systems against high currents, the leads 11, 11<1> are normally connected through two contact arms 4, 41, fixed contacts 8, 81 and resistances 3, 31 to the telephone exchange or subscriber's substation 10, a permanent magnet 6 attracting the armature 1 so that the arms 4, 4<1> engage the contacts 8, 8<1>. On a sustained high current, one or both of the resistances 3, 3<1> are heated, the armature 1 passes its Curie point, ceases to be ferromagnetic and is released so that the contacts 4, 4<1> leave the contacts 8, 81 and engage an earthing contact 9, whereby the lines 11, 11<1> are disconnected from the exchange 10 and connected to earth. Spark-gaps 12, 121 may also be provided. When overload disappears, magnet re-attracts the armature.
GB13308/47A 1946-06-20 1947-05-17 Improvements in or relating to automatic thermomagnetic control Expired GB612803A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR612803X 1946-06-20

Publications (1)

Publication Number Publication Date
GB612803A true GB612803A (en) 1948-11-17

Family

ID=8979075

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13308/47A Expired GB612803A (en) 1946-06-20 1947-05-17 Improvements in or relating to automatic thermomagnetic control

Country Status (2)

Country Link
GB (1) GB612803A (en)
NL (1) NL127389C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0090937A1 (en) * 1982-03-10 1983-10-12 Allied Corporation Temperature sensitivity relay

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0090937A1 (en) * 1982-03-10 1983-10-12 Allied Corporation Temperature sensitivity relay

Also Published As

Publication number Publication date
NL127389C (en)

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