GB801276A - Improvements in circuit arrangements for detecting or indicating the opening of an electric switch - Google Patents
Improvements in circuit arrangements for detecting or indicating the opening of an electric switchInfo
- Publication number
- GB801276A GB801276A GB323655A GB323655A GB801276A GB 801276 A GB801276 A GB 801276A GB 323655 A GB323655 A GB 323655A GB 323655 A GB323655 A GB 323655A GB 801276 A GB801276 A GB 801276A
- Authority
- GB
- United Kingdom
- Prior art keywords
- switch
- contacts
- diodes
- series
- indicating
- 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
- 229910052754 neon Inorganic materials 0.000 abstract 1
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/16—Indicators for switching condition, e.g. "on" or "off"
- H01H9/167—Circuits for remote indication
Landscapes
- Keying Circuit Devices (AREA)
Abstract
801,276. Protective arrangements. BRITISH THOMSON-HOUSTON CO., Ltd. Jan. 30, 1956 [Feb. 3, 1955], No. 3236/55. Class 38 (5). In an arrangement for indicating the opening of a switch connected in series with other switches, a branch including an electric discharge device in series relationship with the switch is connected in shunt to one portion of a potential divider, the circuit characteristics being such that a discharge in the device initiated with the switch closed is maintained while the switch remains closed and is interrupted when the switch is opened. The switches may comprise the contacts C1 ... C4 of overload relays, the contacts being connected in series with the coil CB of a circuit-breaker across a D.C. supply. Neon diodes D1 ... D4 in series with resistors P1 ... P4 are connected between the contacts and the junction T between resistors R1, R2 forming the potentiometer. When all the contacts C1 ... C4 are closed, the momentary depression of a push-button switch S short-circuits the resistor R2 and full voltage is applied to the diodes D1 ... D4 causing them to strike, the glow of the diodes indicating normal operating conditions. Should, for example, contacts C3 open, then the polarity of the voltage across diode D3 and any following diodes, i.e. D4, is reversed momentarily, the diodes D3, D4 extinguish and remain extinguished, even though the contacts C3 may reclose, as the voltage across the diodes is not sufficient for striking to occur until the switch S is pressed. Reference is made to the use of the arrangement in detecting the faulty operation of a series contactor system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB323655A GB801276A (en) | 1955-02-03 | 1955-02-03 | Improvements in circuit arrangements for detecting or indicating the opening of an electric switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB323655A GB801276A (en) | 1955-02-03 | 1955-02-03 | Improvements in circuit arrangements for detecting or indicating the opening of an electric switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB801276A true GB801276A (en) | 1958-09-10 |
Family
ID=9754517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB323655A Expired GB801276A (en) | 1955-02-03 | 1955-02-03 | Improvements in circuit arrangements for detecting or indicating the opening of an electric switch |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB801276A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4398144A (en) | 1980-01-21 | 1983-08-09 | Siemens Aktiengesellschaft | Apparatus for determining the position of a switch and for monitoring the associated line for interruptions and short circuits |
-
1955
- 1955-02-03 GB GB323655A patent/GB801276A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4398144A (en) | 1980-01-21 | 1983-08-09 | Siemens Aktiengesellschaft | Apparatus for determining the position of a switch and for monitoring the associated line for interruptions and short circuits |
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