MIL-S-4040 Solenoid, Electrical General Specification ForThis specification covers the general requirements for electrical solenoids used to actuate various devices through the conversion of electrical signals into mechanical motion. These solenoids are of the axial stroke type and the rotary stroke type.

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MIL-S-4040G

3.5.1.3  Deactuating voltage (or current) (when specified, see 3.1 and 4.7.2.3).  The solenoid shall be in the energized position with more than maximum deactuating voltage (or current) applied, and shall be in the deenergized position with less than minimum deactuating voltage (or current) applied.

3.5.1.4  Operate and release time (when specified, see 3.1 and 4.7.2.4).  The time required for the solenoid to complete the energized function or to revert to the deenergized position shall not exceed the values specified.

3.5.1.5  Coil current (see 4.7.2.5).  The coil current shall not exceed the specified requirements (see 3.1).

3.5.1.6  DC coil resistance (see 4.7.2.6).  The dc coil resistance shall be as specified (see 3.1).

3.5.2  Insulation resistance (see 4.7.3).  The insulation resistance (unless otherwise specified, see 3.1), shall be

1,000 megohms, minimum, except that the insulation resistance between coil and case at the maximum specified ambient temperature shall be 500 megohms, minimum.

3.5.3  Dielectric withstanding voltage (see 4.7.4).  There shall be no evidence of damage, arcing, breakdown, or leakage current in excess of 0.5 milliampere.

3.5.4  Mounting stud and terminal strength (see 4.7.5).  The mounting studs and terminals shall not loosen, nor shall there be any other damage when subjected to the static values of tension and torque specified in table I.  Wire lead terminals shall meet the specified pull requirements.

TABLE I.  Tension and torque leads for solenoid wire leads, solder lug or hook, stud, or screw, and mounting studs.

3.5.5  Static spring return force (when specified, see 3.1 and 4.7.6).  The static spring return force shall fall within the specific limits.

3.5.6  Magnetic effect (when specified, see 4.7.7).  The intensity of the magnetic field surrounding the solenoid shall not exceed the value specified (see 3.1).

3.6  Environmental requirements.

3.6.1  Thermal shock (see 4.7.8).  There shall be no mechanical, electrical, or operational failure, and no cracking, peeling, or flaking of the finish.  During this test, operating force (torque) and deactuating voltage shall be as specified in 3.5.1.1 and 3.5.1.3, respectively.  Following the test, the compensated actuating voltage shall be as specified in

3.5.1.2.

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