GB439655A - Improvements in, or relating to, combined "on" or "off" indicator and overload protective systems for electric switchgear - Google Patents
Improvements in, or relating to, combined "on" or "off" indicator and overload protective systems for electric switchgearInfo
- Publication number
- GB439655A GB439655A GB2612134A GB2612134A GB439655A GB 439655 A GB439655 A GB 439655A GB 2612134 A GB2612134 A GB 2612134A GB 2612134 A GB2612134 A GB 2612134A GB 439655 A GB439655 A GB 439655A
- Authority
- GB
- United Kingdom
- Prior art keywords
- switch
- overload
- closed
- indicator
- lamp
- 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
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
Landscapes
- Thermally Actuated Switches (AREA)
Abstract
439,655. Protective cut-out arrangements. SADLER, A., 65, Temple Row, Birmingham.-(Schiele & Bruchsaler Industriewerke Akt.-Ges. ; Baden-Baden, Germany) Sept. 12, 1934, No. 26121. [Class 38 (v)] In an overload protective system for an electromagnetically operated switch b, control contacts operated by the protective device are adapted to control both the operating coil d of the switch and an auxiliary circuit containing an indicator, such as a discharge lamp m. In the arrangement shown, the control contacts i, k are normally held closed, against the action of a spring h, by a latch f. The overload device comprises three bimetallic strips c included in the phase wires R, S, T, the strips being connected to a pin or rod e adapted to release the latch f in the event of an overload in any of the phase wires. When the control contacts are closed the indicator lamp m is short-circuited, and the switch b can be closed by closing a switch n, which may be located at any desired distance from the switch b. On overload, the contacts i, k separate and the lamp m is thrown into circuit with the coil d, the current being reduced to a value which is insufficient to hold the switch b closed but sufficient to light the lamp. The control contacts are reset by a push-button l.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2612134A GB439655A (en) | 1934-09-12 | 1934-09-12 | Improvements in, or relating to, combined "on" or "off" indicator and overload protective systems for electric switchgear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2612134A GB439655A (en) | 1934-09-12 | 1934-09-12 | Improvements in, or relating to, combined "on" or "off" indicator and overload protective systems for electric switchgear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB439655A true GB439655A (en) | 1935-12-11 |
Family
ID=10238714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2612134A Expired GB439655A (en) | 1934-09-12 | 1934-09-12 | Improvements in, or relating to, combined "on" or "off" indicator and overload protective systems for electric switchgear |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB439655A (en) |
-
1934
- 1934-09-12 GB GB2612134A patent/GB439655A/en not_active Expired
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