MIL-DTL-19648 Relays, Time Delay, Thermal, General Specification ForThis specification covers the general requirements for thermal, time delay relays for use in electrical applications. Relays covered by this specification are capable of meeting the electrical and environmental requirements when mounted directly to the structure of aircraft, missile, spacecraft, ship, and other primary vehicles or in ground support and shipboard equipment. Other ratings may be as specified \(see 3.1\).

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MIL-DTL-19648E

3.19 Life. When tested as specified in 4.7.16, relays will not operate erratically. Contact resistance (or

contact voltage drop) and insulation resistance at room ambient shall be as specified in 3.6.1 and 3.9,

respectively. At the intervals specified and at the end of life test, normal operate time tolerance shall be

as specified in 3.6.2.1.1 and 3.6.2.1.2.

3.20 Marking. Unless otherwise specified (see 3.1 and 6.2), the relays shall be marked in accordance

with MIL-STD-130 and shall include the following:

a. Manufacturer's name or code symbol in accordance with MIL-STD-1285.

b. Date code in accordance with MIL-STD-1285.

c. Heater voltage.

d. Specification part number.

e. Contact rating (volts and amperes).

f. Circuit diagram.

g. Time delay rating.

3.20.1 Military part number. The military part number shall be in accordance with 1.2.1.

3.21 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or

environmentally preferable materials should be used to the maximum extent possible provided that the

material meets or exceeds the operational and maintenance requirements, and promotes economically

advantageous life cycle costs.

3.22 Workmanship. Relays shall be processed in such a manner as to be uniform in quality and shall

be free from cracked or displaced parts, sharp edges, burrs, and other defects that will affect life,

serviceability, or appearance.

4. VERIFICATION

4.1 Classification of inspections. The inspection requirements specified herein are classified as

follows:

a. Materials inspection (see 4.2).

b. First article inspection (see 4.4).

c. Inspection of relays not covered by specification sheets (see 4.5).

d. Conformance inspection (see 4.6).

4.2 Materials inspection. Materials inspection shall consist of certification supported by verifying

information that the materials used in fabricating the relays are in accordance with the applicable

referenced specification or requirements prior to such fabrication.