GB499533A - Improvements in or relating to overload tripping devices for automatic circuit breakers or similar electrical switchgear - Google Patents
Improvements in or relating to overload tripping devices for automatic circuit breakers or similar electrical switchgearInfo
- Publication number
- GB499533A GB499533A GB31427/37A GB3142737A GB499533A GB 499533 A GB499533 A GB 499533A GB 31427/37 A GB31427/37 A GB 31427/37A GB 3142737 A GB3142737 A GB 3142737A GB 499533 A GB499533 A GB 499533A
- Authority
- GB
- United Kingdom
- Prior art keywords
- trip
- poles
- box
- recess
- lever
- 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
- H01H71/40—Combined electrothermal and electromagnetic mechanisms
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Breakers (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
499,533. Electrically - released switches ; arc - rupturing in switches. CRABTREE & CO., Ltd., J. A. (Schiele Industriewerke) Nov. 16, 1937, Nos. 31427 and 31428. [Class 38 (v)] A circuit-breaker comprises a heat sensitive trip disposed in a heat-insulating box for opening on sustained normal overloads, and an electromagnetic trip disposed in a recess outside the box so as to be thermally insulated from the thermal trip, and adapted for opening on abnormal overloads. The poles of the magnet may extend in proximity to the breaker contacts for arc-quenching purposes. In the three-phase example shown, the heat-insulating box 1 is partitioned at 1a to form three releasecontaining chambers 2 and a chamber 3 accommodating the ambient-temperature compensating means and an auxiliary switch controlling the main tractive-magnet coil and adapted to be opened by the trip member 4 pivoted at 13. Each chamber 2 contains a U-shaped thermal strip 5 embracing a heating coil 6 in the associated phase, the arrangement being generally as described in Specification 498,325. An external recess 15 formed in the box 1 below each lever of the trip member 4, receives an electromagnetic trip the poles 16 of which have extensions 17 on each side of the fixed contact 18, these extensions having projections 20 engaging retaining holes 21 in the recess-wall. The coil 22 is on a core extending between the poles, and the armature 24 is on a spring-loaded pin 25 which extends between the poles through the upper recess wall for operating the associated trip lever, the armature-travel being suitably restricted so as not to weaken the blow-out field unduly. Hollow or cavity walls may be provided for the partitions la and end-walls 1b of the box, and the position of the depending arm 12 of each trip lever assists the thermal isolation. Specification 439,242 is referred to in the second Provisional Specification.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE205328X | 1937-03-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB499533A true GB499533A (en) | 1939-01-25 |
Family
ID=5786597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB31427/37A Expired GB499533A (en) | 1937-03-01 | 1937-11-16 | Improvements in or relating to overload tripping devices for automatic circuit breakers or similar electrical switchgear |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH205328A (en) |
| FR (1) | FR834475A (en) |
| GB (1) | GB499533A (en) |
| NL (1) | NL53019C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL94855C (en) * | 1954-12-27 | |||
| DE6913744U (en) * | 1969-04-05 | 1969-07-24 | Bbc Brown Boveri & Cie | MAGNETIC TRIGGER FOR INSTALLATION SWITCH |
-
0
- NL NL53019D patent/NL53019C/xx active
-
1937
- 1937-11-16 GB GB31427/37A patent/GB499533A/en not_active Expired
-
1938
- 1938-02-24 CH CH205328D patent/CH205328A/en unknown
- 1938-03-01 FR FR834475D patent/FR834475A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR834475A (en) | 1938-11-22 |
| NL53019C (en) | |
| CH205328A (en) | 1939-06-15 |
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