Power Relay 50086 Series



The 50087 Series Power Breaker includes part numbers 50087-004, 50087-006, and 50087-007 are manufactured or cataloged by TRW Aeronautical Systems, Lucas Aerospace (formerly Lucas Aerospace and also Lear Siegler). The Power Breaker (sometimes referred to as Relay or Power Relay) are three-pole, single-throw, 90 KVA, 265, ampere, magnetically latched circuit breakers. They perform a basic function in the aircraft electrical system as generator or bus tie relays. The complete power breaker assembly is enclosed in a metal box. This box is fitted with four mounting “feet”, one at each corner, for mounting. The unit may be installed in either a horizontal or vertical attitude. The purpose of the power breaker functioning as a generator relay, is to electrically connect each generator to its appropriate load bus and the primary purpose of the power breaker functioning as a bus tie relay, is to connect and disconnect the generator systems to the AC tie bus for paralleling as necessary. Generally, these Power Breakers are used on heavy jet aircraft serving the commercial and military sectors.

Additional information

Weight 8 lbs
Dimensions 12 × 12 × 12 in

Aircraft Type

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Aircraft Model


Part Number

50086-001, 50086-002, 50086-003, 50086-1012, 50086-1017, 50086-1022