GB312084A - Improvements in and relating to electric circuit controlling systems - Google Patents

Improvements in and relating to electric circuit controlling systems

Info

Publication number
GB312084A
GB312084A GB15493/29A GB1549329A GB312084A GB 312084 A GB312084 A GB 312084A GB 15493/29 A GB15493/29 A GB 15493/29A GB 1549329 A GB1549329 A GB 1549329A GB 312084 A GB312084 A GB 312084A
Authority
GB
United Kingdom
Prior art keywords
relating
electric circuit
circuit controlling
controlling systems
systems
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
GB15493/29A
Other languages
English (en)
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 GB312084A publication Critical patent/GB312084A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
    • H01H33/66—Vacuum switches
    • H01H33/668—Means for obtaining or monitoring the vacuum
GB15493/29A 1928-05-19 1929-05-17 Improvements in and relating to electric circuit controlling systems Expired GB312084A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US279154A US1731866A (en) 1928-05-19 1928-05-19 Circuit-controlling system

Publications (1)

Publication Number Publication Date
GB312084A true GB312084A (en) 1930-10-17

Family

ID=23067861

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15493/29A Expired GB312084A (en) 1928-05-19 1929-05-17 Improvements in and relating to electric circuit controlling systems

Country Status (4)

Country Link
US (1) US1731866A (da)
BE (2) BE283147A (da)
GB (1) GB312084A (da)
NL (1) NL28920C (da)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7499255B2 (en) * 2006-01-31 2009-03-03 Thomas & Betts International, Inc. Vacuum-type electrical switching apparatus
ITMI20071511A1 (it) * 2007-07-26 2009-01-27 Elettrotec Srl "vuotostato elettronico con parametri principali settabili rapidamente anche durante il funzionamento dell'impianto sotto controllo"

Also Published As

Publication number Publication date
US1731866A (en) 1929-10-15
BE360836A (da)
BE283147A (da)
NL28920C (da)

Similar Documents

Publication Publication Date Title
GB320857A (en) Improvements in and relating to electric switches
GB308615A (en) Improvements in and relating to electric circuit controlling apparatus
GB305480A (en) Improvements in and relating to electric circuit interrupting devices
GB313563A (en) Improvements in and relating to electric circuit interrupters
GB319861A (en) Improvements in or relating to electrical switches
GB312084A (en) Improvements in and relating to electric circuit controlling systems
GB303835A (en) Improvements in and relating to electric switches
GB312085A (en) Improvements in and relating to electric circuit interrupting systems
GB311822A (en) Improvements in and relating to electric switches
GB329445A (en) Improvements in and relating to electric switches
GB307510A (en) Improvements in and relating to electric switches
GB312365A (en) Improvements in and relating to electric switches
GB314085A (en) Improvements in and relating to electric selective circuit control
GB308654A (en) Improvements in and relating to electric circuit interrupters
GB306045A (en) Improvements in and relating to electric distribution systems
GB317186A (en) Improvements in or relating to electric circuit controlling apparatus
GB306337A (en) Improvements in or relating to electric switchgear
GB294574A (en) Improvements in and relating to electric control systems
GB311558A (en) Improvements in or relating to electric relays and contact-makers
GB311528A (en) Improvements in and relating to electric switches
GB312456A (en) Improvements in and relating to electric switches
GB317167A (en) Improvements in and relating to electric switches
GB318262A (en) Improvements in and relating to electric switches
GB305180A (en) Improvements in and relating to electric switches
GB309043A (en) Improvements in and relating to electric switches