GB176547A - Improvements in electric circuit breakers and the like - Google Patents
Improvements in electric circuit breakers and the likeInfo
- Publication number
- GB176547A GB176547A GB3571520A GB3571520A GB176547A GB 176547 A GB176547 A GB 176547A GB 3571520 A GB3571520 A GB 3571520A GB 3571520 A GB3571520 A GB 3571520A GB 176547 A GB176547 A GB 176547A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- contact
- conductor
- breaker
- current
- 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
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
- H01H71/2418—Electromagnetic mechanisms combined with an electrodynamic current limiting mechanism
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Electromagnets (AREA)
Abstract
176,547. Bolton, R. A. R., and Bacon, H. Doc. 20, 1920. Automatic circuit-breakers; electromagnetic switches.-In circuit-breakers of the type in which the forces producing the opening movement are due, wholly or in part, to the interaction of the current in a conductor formed or carried by the movable element of the breaker and a current in an adjacent conductor or conductors, the currents in the two interacting conductors are arranged to flow in the same direction and the circuit is broken by the resulting attractive action between them. A third conductor, on the opposite side of the movable conductor, may be arranged to carry current in the opposite direction so that the resulting repulsion may assist the circuit-breaking action. In the construction shown in Figs. 1 and 2, the movable contact bar D is pivoted at F and carries an armature C cooperating with a U-shaped magnet A. The fixed contact arm J which may be a yielding contact pivoted at L, is nearly parallel to the movable contact-member. The current, entering at F, passes through the breaker and through a straight conductor or a number of turns B of conductor parallel with the movable contact-member, and, finally, through a blow-out coil H. The adjacent conductors D, B carry current in the same direction and, consequently, the interaction between them tends to move the arm D to the off position. A force in the same direction is produced by the repulsive action of the conductor J on the contact-member, the currents in this case being in opposite directions. The circuit-breaker may be closed electromagnetically by a shunt coil N under the control of a push-button R and maintained by a reduced shunt current through the resistance S introduced by the auxiliary contact switch Q which may close, automatically, when the circuit-breaker closes. The circuit-breaker need not entirely break the circuit; the contacts may be shunted by a resistance T. The blow. out magnet is excited from an independent source as well as by the coil H, the coil H serving mainly to counteract the demagnetizing action of the current through the contacts E, G. The circuit-breaker may reset itself automatically by providing that the auxiliary switch arm Q closes the push-switch R when the circuit-breaker fully opens. Latches and detents may be employed as desired, for example, to hold the contact-member in the open position. In the modified construction shown in Fig. 3, the armature C is dispensed with and the cores A, M are united to constitute a single closed core on which windings Y, Y<1>, corresponding to the windings B, N, are wound to form consequent poles at the air gap in which the contact-carrying conductor W is arranged to be attracted by one of the windings and repelled by the other. The contact arm W may be in the form of a coil, the otherwise idle exterior turns of which may be located in the gap of a second closed core which may be incorporated with the first. The contact arm W is made as light as possible in order to reduce the moment of inertia of the moving parts to a minimum.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3571520A GB176547A (en) | 1920-12-20 | 1920-12-20 | Improvements in electric circuit breakers and the like |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3571520A GB176547A (en) | 1920-12-20 | 1920-12-20 | Improvements in electric circuit breakers and the like |
Publications (1)
Publication Number | Publication Date |
---|---|
GB176547A true GB176547A (en) | 1922-03-16 |
Family
ID=10380773
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3571520A Expired GB176547A (en) | 1920-12-20 | 1920-12-20 | Improvements in electric circuit breakers and the like |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB176547A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2831946A (en) * | 1955-11-09 | 1958-04-22 | Ite Circuit Breaker Ltd | Closed magnetic core blowout with series coils |
EP0009454A1 (en) * | 1978-09-21 | 1980-04-02 | Legrand | Circuit breaker with an electrodynamic tripping device |
FR2445604A2 (en) * | 1978-12-26 | 1980-07-25 | Legrand Sa | Cut=out switch with electrodynamic mechanism - includes thermal bimetal cut=out and electromagnetic cut=out for operating latch lever |
EP2251887B1 (en) * | 2009-05-15 | 2016-03-16 | Abb Ag | Electromagnetic trip device |
-
1920
- 1920-12-20 GB GB3571520A patent/GB176547A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2831946A (en) * | 1955-11-09 | 1958-04-22 | Ite Circuit Breaker Ltd | Closed magnetic core blowout with series coils |
EP0009454A1 (en) * | 1978-09-21 | 1980-04-02 | Legrand | Circuit breaker with an electrodynamic tripping device |
FR2445604A2 (en) * | 1978-12-26 | 1980-07-25 | Legrand Sa | Cut=out switch with electrodynamic mechanism - includes thermal bimetal cut=out and electromagnetic cut=out for operating latch lever |
EP2251887B1 (en) * | 2009-05-15 | 2016-03-16 | Abb Ag | Electromagnetic trip device |
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