GB667520A - Improvements in air blast electric circuit breakers - Google Patents

Improvements in air blast electric circuit breakers

Info

Publication number
GB667520A
GB667520A GB898850A GB898850A GB667520A GB 667520 A GB667520 A GB 667520A GB 898850 A GB898850 A GB 898850A GB 898850 A GB898850 A GB 898850A GB 667520 A GB667520 A GB 667520A
Authority
GB
United Kingdom
Prior art keywords
contact
spring
current
broken
coil
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
GB898850A
Inventor
Bertil Broms
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
Allmanna Svenska Elektriska AB
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 ASEA AB, Allmanna Svenska Elektriska AB filed Critical ASEA AB
Priority to GB898850A priority Critical patent/GB667520A/en
Publication of GB667520A publication Critical patent/GB667520A/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
    • H01H33/70—Switches with separate means for directing, obtaining, or increasing flow of arc-extinguishing fluid

Abstract

667,520. Air-break switches; switches, partly electromagnetic. ALLMANNA SVENSKA ELEKTRISKA AKTIEBOLAGET. April 12, 1950. No. 8988/50. Class 38 (v). The release of a circuit-breaker is prevented when the pressure of the arc-extinguishing air falls below a certain value, except when the current to be broken is also below a certain value. The release circuit includes a trip coil 14 and a contact 13 carried by the armature 4 of a relay 2 having a coil 3 carrying the current to be broken. The contact 13 is normally held closed by a spring 5 connected through a lever 6 to a piston 10. If the pressure falls, a spring 11 pushes the piston to the left, thereby reducing the tension on the spring 5, so that if coil 3 is carrying a current which cannot be safely broken, the armature 4 is attracted to open contact 13, so as to prevent completion of the trip circuit at contact 1.
GB898850A 1950-04-12 1950-04-12 Improvements in air blast electric circuit breakers Expired GB667520A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB898850A GB667520A (en) 1950-04-12 1950-04-12 Improvements in air blast electric circuit breakers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB898850A GB667520A (en) 1950-04-12 1950-04-12 Improvements in air blast electric circuit breakers

Publications (1)

Publication Number Publication Date
GB667520A true GB667520A (en) 1952-03-05

Family

ID=9863199

Family Applications (1)

Application Number Title Priority Date Filing Date
GB898850A Expired GB667520A (en) 1950-04-12 1950-04-12 Improvements in air blast electric circuit breakers

Country Status (1)

Country Link
GB (1) GB667520A (en)

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