MIL-DTL-15291G
Figure 1. Test wiring for ac endurance testing of switches, type designation SR3B.
4.7.9.2 Direct current. Referring to the columnar headings of table IX, the switch shall make, break,
and carry (a) amperes at (b) volts for a total of (c) operations (see 6.2). An operation is specified in
4.7.9.1. The rate of testing shall not exceed (d) operations per minute. The test loading shall be
nominally resistive. The duty cycle shall be 50 percent ON and 50 percent OFF. The test wiring for
qualification testing for other than switching characteristic A, shall be in accordance with figure 2. Test
wiring for other switching characteristics shall simulate intended switch applications (see 3.1). Direct
current endurance tests are required for class SR (snap action) switches only.
TABLE IX. DC endurance.
(a)
(b)
(c)
(d)
Switch
Current
Voltage
Electrical
Test rate
class
(amperes)
(volts)
operations
(operations
(number of
per minute)
operations)
1SR
10
120
20,000
15
3SR
30
250
15,000
15
6SR
60
250
4,000
5
20SR
200
250
4,000
3
14
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