MIL-DTL-17587C(SH)
4.5.6.1.2 Electrical endurance test.
4.5.6.1.2.1 Test setup and method of cycling. Rated voltage and current shall be applied to the circuit breakers
at the power factor specified in the applicable specification sheet. Circuit breakers shall be electrically operated
with applicable attachments as discussed in 4.5.6.2.
4.5.6.1.2.2 Number and rate of operations. The number of operations shall be in accordance with the
applicable specification sheet. Circuit breaker types rated up to 1,600 A shall be operated four times a minute for 10
minutes. Circuit breaker types rated above 1,600 A shall be operated three times a minute for 10 minutes. The
remainder of the tests for all circuit breaker types shall be conducted at no less than one close-open operation every
2 minutes.
4.5.6.2 Attachments. Electric closing devices, undervoltage release devices, and shunt trips shall be used to
cycle the circuit breaker during electrical endurance. Circuit breaker electrical endurance rate of operations as
specified in the applicable specification sheet shall be maintained. Rate of operations as specified in the applicable
specification sheets for the circuit breaker electrical endurance shall be maintained. The operations counter shall
indicate the correct number of cycling operations at the conclusion of mechanical and electrical endurance testing.
4.5.7 Calibration.
4.5.7.1 Long-time delay. Circuit breakers shall be tested in accordance with Tables VII, VIII, and IX as
applicable.
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