MIL-DTL-21604F
4.8.6 Dielectric withstanding voltage (see 3.10). Switches shall be tested in accordance with method 301 of MIL-
STD-202. The following details shall apply:
a.
The test voltage shall be 1,200 volts root mean square (rms), 60 hertz (Hz) except that following the
endurance tests, the test voltage shall be 600 volt rms, 60 Hz.
b.
Nature of potential: Alternating current (ac).
c.
For group A inspection, the test voltage shall be applied for 5 seconds. For qualification and group B and
group C inspection, the test voltage shall be applied for 1 minute.
d.
In each switch position, the test voltage shall be applied between open circuit contacts, and between closed
contacts and noncurrent carrying parts.
4.8.7 Insulation resistance (see 3.11). Switches shall be tested in accordance with method 302 of MIL-STD-202.
The following details shall apply:
a.
Test condition: B.
b.
Points of measurements: In each switch position, the test voltage shall be applied between open circuit
contacts, and between closed contacts and noncurrent carrying parts.
c.
For group B inspections, the test voltage shall be applied for 15 seconds. For qualification and group C
inspection, the test voltage shall be applied for 1 minute.
4.8.8 Contact resistance (see 3.12). Switches shall be tested in accordance with method 307 of MIL-STD-202.
The following details and exceptions shall apply:
a.
Method of connection: Test leads shall be connected by a method suitable for the switch terminals.
b.
Test current: Rated current, except after mechanical endurance: 100 milliampere (mA).
c.
Maximum open-circuit voltage: Related voltage, except after mechanical endurance: 4 volts.
d.
Number of activations prior to measurement: 1.
e.
Number of measurements: Five separate measurements shall be taken and the average value calculated.
4.8.9 Endurance (see 3.13). Electrical and mechanical endurance tests shall be performed in the order as shown
in 4.8.9.1 and 4.8.9.2. The contact resistance of each pole subjected to the electrical endurance test, and one pole in
each deck not subjected to the endurance test, shall be determined as specified in 4.8.8 at the following times:
a.
Before electrical endurance.
b.
After every 4,000 operations during electrical endurance.
c.
After electrical endurance.
d.
After mechanical endurance.
4.8.9.1 Electrical. Each deck or a maximum of five switching circuits in the switch shall make and break the rated
load. Three decks shall be distributed uniformly over the entire length of the switch. Switching shall be double-pole
break as shown on figure 1. The switch shall be subjected to 40,000 cycles of operation. A cycle of operation is
defined as the movement of the switch shaft from an open circuit position to an adjacent closed circuit position and
return to the open circuit position. The cycling rate shall be approximately 30 cycles per minute (c/m) with equal
periods of time in the open and closed positions. Switches shall be monitored to determine when any loaded contact
fails to open and close in proper sequence.
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