MIL-R-5757-SUP-2 Relays, Electromagnetic, General Specification forThis specification covers the general performance requirements for electrical relays with contact ratings up to and including 10 amperes for use in electronic, communications, and other applications see 6.1.

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MIL-R-5757J

3.4.1 Case. Unless otherwise specified (see 3.1), the case shall not be electrically connected to the contacts or coil; however, it may be used as part of the magnetic circuit.

3.4.1.1 Case grounding. When specified (see 3.1), a means for connecting the relay case to ground shall be provided.

3.4.2 Sealing process. Relays shall be dried, degassed, backfilled with an atmosphere, and sealed in such a manner that all the requirements of this specification are met. Adjunct sealant (see 6.8), if used, must comply with the following characteristics:

a. Shall not extend above 20 percent of the length of the exposed terminals above the glass meniscus. b. Trace color is permitted if it is a natural result of the sealant process.

c. Shall form, after curing, a permanent nonconductive, noncracking seal under all relay environments.

3.4.3 Contacts. Contacts shall have load ratings and arrangements as specified (see MIL-STD-1285 and 3.1) and unless otherwise specified (see 3.1), shall be capable of carrying the maximum rated current continuously as well as making and breaking the specified current under all environmental conditions specified herein.

3.4.3.1 Orientation of contact motion (dry reed relays only). The flat surface of the reed contact shall be parallel to two sides at right angles to the relay housing unless otherwise specified (see 3.1).

3.4.3.2. Switch capsules. Unless otherwise specified (see 3.1), switch capsules used in dry reed relays shall be such that the performance requirements of this specification are met. Switch capsule leads shall not be used as terminals.

3.4.4 Coils. Coils shall be adequately insulated electrically from the contacts and the case. The resistance and rated voltage (or current) shall be as specified (see 3.1). Coils shall be designed for continuous operation at maximum rated voltage (or current) and temperature, unless otherwise specified (see 3.1).

3.4.4.1 Terminal identification. When specified (see 3.1), a bead of contrasting color shall be used to designate the X1 (positive, if applicable) terminal (see figure 1 and MIL-STD-1285 ).

FIGURE 1. Terminal symbols and markings.