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Revision B, January 24, 1992

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Superseded By: MIL-DTL-38159

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Description / Abstract:

The male and female connectors and receptacles covered by this specification are intended for use with ground support and base facility equipment (ramp or wall-mounted outlets) requiring 480/277V. The series 1 connectors and receptacles are for use in nonhazardous locations. The series 2 connectors and receptacles are for use in hazardous (classified) locations. This specification is not intended to include specifications for explosionproof receptacle housings. The series 2 connectors specified herein can be used in enclosures approved for use in hazardous (classified) locations. The receptacle housings for the series 2 receptacle inserts, when used in hazardous (classified) locations, must include a rotatable collar with spring door.

All series are designed to assure proper orientation of the mating halves prior to electrical circuit closure. All series are designed to assure the grounding contacts (see 6.4.5) are engaged first and disengaged last when the connectors are mated (see 6.4.10) and unmated. The control contacts (see 6.4.3) are designed to assure the control circuit is not completed until the power contacts (see 6.4.12) are mated. The control contacts will disengage prior to the power contacts assuring the connector is not used to interrupt the load current.

a. Plugs and receptacles with different electrical ratings are not interchangeable with each other.

b. A receptacle will not accommodate a plug other than one specifically designed for use with the combination with the following exceptions:

1) Male plugs for use in hazardous (classified) locations (see 6.4.6) will mate with nonhazardous (see 6.4.11) female receptacles if the electrical ratings of the plug and receptacle are the same.

2) Plugs for use in nonhazardous locations will not mate with hazardous (classified) receptacles even if the electrical rating of the plug and receptacle are the same.

3) Male plugs procured under earlier revisions of this specification will mate with type A female receptacles. However, the male plug does not have provisions to engage the grounding circuit

provided in the type A receptacle, and the make-first, break-last feature is therefore not present.