Remote control circuit breaker protects aircraft
An
E-T-A Circuit Breakers product story
Edited by the Engineeringtalk editorial team
May 2, 2007
The E-T-A 4930 circuit breaker can be placed close to the system it is protecting and wiring harnesses and hence weight can be significantly reduced.
E-T-A Circuit Breakers has introduced the E-T-A 4930, a new remotely controlled, single-pole circuit breaker (RCCB) approved to MIL-PRF-83383 for the protection of aircraft electrical systems and other high-performance applications.
Low-current remote switching is achieved through the use of a conventional, manually operated aircraft-style thermal circuit breaker such as E-T-A types 4120 or 483.
The 4930 can be placed close to the system it is protecting and wiring harnesses and hence weight can be significantly reduced.
The E-T-A 4930 uses an integral bi-stable linear motor to switch the contacts.
Its on/off status will synchronise with the 4120/483 circuit breaker, matching the status of that controlling circuit breaker.
If power is applied to a de-energised 4930, it will adopt the same switching status as the control circuit breaker; and if the RCCB trips in the event of a load circuit fault, the control circuit breaker will trip, thus providing a visual indication of the fault.
In the event of a short circuit, the switching circuits of the RCCB will not cycle between on and off.
The new E-T-A 4930 remote control circuit breaker is available in a range of current ratings from 5A to 100A and can be supplied with or without auxiliary contacts which can provide external signalling.
It is temperature-compensated, with a bi-metal actuator which trips the mechanism within a specified time under overcurrent conditions.
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