MIL-PRF-11767 Relay Assembly: Gun-Firing, Waterproof, 24 Volt DcThis specification covers one type of waterproof gun-firing relay assembly with a nominal rating of 24 volts \(V\) direct current \(dc\) for use in the main gun and machine gun circuits of military combat vehicles. The assembly consists of relays which control the firing of the main gun by the operation of a time delay circuit and a separate fast-operating, fast-release relay which controls the firing of the machine gun \(see 6.1\).

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16

MIL-PRF-11767G(AT)

3.3.2 Weight. The maximum weight of the relay assembly shall be four pounds (lb).

3.3.3 Mounting bracket. When brackets are used, they shall be an integral part of the

housing or shall be securely attached thereto, in a manner to prevent any movement between

assembly and the mounting bracket in service.

3.3.4 Polarity. The relay assembly shall operate in a circuit having the negative battery

terminal grounded.

3.4 Environmental requirements. The design, materials, and construction of relay

assembly shall enable the unit to operate in the following environmental conditions. The relay

assembly shall subsequently meet the requirements specified in 3.6.1, 3.6.4, 3.6.5, 3.6.7,

and 3.6.8.

3.4.1 Vibration. The relay assembly shall evidence no mechanical or electrical

malfunction (opening or closing of relay contacts).

3.4.2 Shock. The relay assembly shall evidence no mechanical or electrical malfunction

(opening or closing of relay contacts).

3.4.3 Corrosion. Metals shall be of a corrosion-resistant type or shall be treated to resist

corrosion. The relay shall evidence no corrosion.

3.4.4 Waterproofness. The relay assembly shall be waterproof.

3.5 Support and ownership requirements.

3.5.1 Materials. The relay assembly shall not produce any hazards to personnel or the

environment resulting from the use of asbestos or cadmium.

3.5.1.1. Dissimilar metals. Except where necessary to complete an electrical circuit, there

shall be no contact between dissimilar metals, which would encourage galvanic action.

3.5.2 Springs. Springs shall not be used to transmit current.

3.5.3 Endurance. The relay assembly shall remain mechanically and electrically operative

and the voltage drop across the main gun and machine gun relay contacts carrying rated current,

shall not exceed the limits specified in 3.6.7. The relay assembly shall subsequently meet the

requirements of 3.6.1 and 3.6.4 through 3.6.7.