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This specification establishes general requirements for a family of trip-free Electromechanical Power Controller/Relays (EMPC) with electronic overcurrent sensing and control, intended for use in electrical systems conforming to RTCA, D0160 Revision C. These devices will be utilized for the protection of ac and/or dc electrical systems, bus feeders, and electrical equipment.

The primary function of this specification is to cover the general requirements of one-, two-, and three-phase (often referred to as poles) trip-free circuit breakers for use in aircraft electric systems conforming to MIL-STD-704. As a secondary function, this specification may possibly cover the general requirements of one-, two- and three-phase circuit breakers for use in primary vehicles, other than aircraft, when mounted directly to the structure.

This specification covers general requirements for direct current electrically held, environmentally sealed toggle switches for use in alternating current (AC) and direct current (DC) applications. (See 6.1.)