scope:

This specification establishes the requirements for time delay relays that are a combination of hybrid microcircuits, solid state electronics with an integral electromagnetic relay or solid state output. Relays covered by this specification are intended for use in aerospace and associated ground support electrical and electronic systems and equipment (see 6.1).

Time delay relays covered by this specification shall be of the following types and classes, as specified (see 3.1 and 6.4.1):

Type I - Time delay on operate. IIA - Time delay on release (separate control and power terminals). IIB - Time delay on release (true). III - Interval timer. IV - Repeat cycle timer. V - Time sequence as specified (see 3.1). Class A - Hybrid (integral electromagnetic relay qualified to MIL-R-5757 or MIL-R-39016). B - Hybrid (integral electromagnetic relay qualified to MIL-R-6106). C - Solid state. D - Hybrid (integral electromagnetic relay not qualified with contact ratings 5 amperes or lower). E - Hybrid (integral electromagnetic relay not qualified with contact ratings 5 amperes or higher).

Time delay relays with electromechanical relay output and with contact ratings 10 amperes or greater shall be class B or class E.

The military part number shall consist of the letter M, the basic number of the specification and specification sheet, the assigned dash number, and a quality level (see 3.1). Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Electronic Support Division, AFLC, 2750 ABW/ES, Gentile Air Force Station, Dayton, OH 45444 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

intended Use: