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 \(see 6.1\).

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MIL-PRF-11767G(AT)

3.5.4 Color. Exterior surfaces of the relay assembly housing shall be white.

3.5.5 Identification marking. Identification marking shall be permanent and legible and,

as a minimum, shall include the following:

"Relay assembly: gun-firing"

"24 Vdc waterproof"

Military Part Number (P/N) (see 6.2)

Manufacturer's name

Manufacturer's serial number (if applicable)

Date of manufacture (month, year)

3.6 Operating requirements.

3.6.1 Time delay. The relay shall provide a time delay (time the main gun-firing relay

contacts are closed) between 0.10 and 0.50 seconds throughout the operating voltage range of

18 to 30 Vdc. The relay assembly shall subsequently meet the requirements specified in 3.5.3 and

3.6.2 through 3.6.8.

3.6.2 Operating current. When the main gun relay is energized, the operating current

shall not be more than 0.35 amperes (A).

3.6.3 Dielectric strength. The relay assembly shall evidence no loosening, cracking,

burning, smoking, rupturing or any other damage to the insulation. It shall subsequently meet the

requirements of 3.6.1, 3.6.4, 3.6.5, and 3.6.7.

3.6.4 Pick-up voltage. The pick-up voltage of the machine gun relay shall not exceed

18 Vdc when tested for ten cycles (deenergize and energize).

3.6.5 Drop-out voltage. The drop-out voltage of the machine gun relay shall be between

1.5 and 8 Vdc.

3.6.6 Coil current. The coil current of the machine gun relay shall be not more than

0.35 A.

3.6.7 Contact voltage drop. Unless otherwise specified (see 6.2), the voltage drop across

external terminals of the main gun and machine gun relay assemblies, shall not exceed individual

reading of 175 millivolts (mV) or an average of 150 mV before cycling and individual reading of

not more than 200 mV or an average of 175 mV after cycling tests.

3.6.8 Extreme temperature operation. Extreme temperatures shall not be detrimental to

the performance of the relay assembly. The relay assembly shall meet the requirements of 3.6.1

at extreme temperatures.