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E-T-A introduces a new remote control circuit breaker for aircraft electrical systems and other high-performance applications

02 May 2007

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: thus 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 utilises 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: it features a bi-metal actuator which trips the mechanism within a specified time under overcurrent conditions.

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