GB1114725A - Electrical protection circuit - Google Patents
Electrical protection circuitInfo
- Publication number
- GB1114725A GB1114725A GB524367A GB524367A GB1114725A GB 1114725 A GB1114725 A GB 1114725A GB 524367 A GB524367 A GB 524367A GB 524367 A GB524367 A GB 524367A GB 1114725 A GB1114725 A GB 1114725A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plunger
- coil
- contacts
- moves
- relay
- 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
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
- H02H3/162—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass for ac systems
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Auxiliary Devices For Machine Tools (AREA)
Abstract
1,114,725. Protective arrangements. ELECTRONIC INSTRUMENTS CORPORATION. 3 Feb., 1967, No. 5243/67. Heading H2K. In a supply circuit, e.g. for an electric tool, comprising two transformers 3, 4 with seriesconnected primary windings 5, 5a and secondary windings 8, 9, the junction 10 between the secondary windings is connected to earth through the coil 11 of an earth leakage relay. In the event of an earth fault in an electric tool or other apparatus connected to secondary conductors 6, 7, the relay closes contacts 12, 14 to energize the coil 23 of a main relay. This coil moves a plunger 23a to open main contacts 24, 25 and through co-operating projections 26, 27 moves a plunger 28 to close contacts 32, 33 in circuit with an indicating lamp 34a. To reclose the main contacts 24, 25, a push-button switch 38 is operated to energize a coil 29 which moves the plunger 28. This plunger through the projections 26, 27 returns the plunger 23a to close the main contacts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB524367A GB1114725A (en) | 1967-02-03 | 1967-02-03 | Electrical protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB524367A GB1114725A (en) | 1967-02-03 | 1967-02-03 | Electrical protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1114725A true GB1114725A (en) | 1968-05-22 |
Family
ID=9792407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB524367A Expired GB1114725A (en) | 1967-02-03 | 1967-02-03 | Electrical protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1114725A (en) |
-
1967
- 1967-02-03 GB GB524367A patent/GB1114725A/en not_active Expired
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