MIL-DTL-17361G(SH)
4.5.6.2.1 Operating voltage range. With the circuit breaker in the closed position, two checks each shall be
conducted at the minimum, nominal, and maximum voltage in the range. The circuit breaker shall not open during
any check.
4.5.6.2.2 Dropout voltage range. With voltage in the applicable dropout range, the following criteria shall be
met:
a.
The undervoltage release shall trip the circuit breaker.
b.
The circuit breaker shall not be able to be reclosed.
c.
The applicable maximum power requirements shall not be exceeded.
4.5.6.2.3 Time delay. Time delay for undervoltage releases shall be tested to ensure that they meet the
requirements as specified in 3.5.19.4.1. Time delay shall be measured from the time that the voltage signal goes to
zero to the first indication of circuit breaker opening.
4.5.6.3 Shunt trips. Two checks each shall be conducted at the minimum, nominal, and maximum voltage in
the range. The voltage shall be applied with the circuit breaker in the closed position. The circuit breaker shall trip
during each check and applicable maximum power requirements shall not be exceeded.
4.5.7 Undervoltage time delay. Time delay for undervoltage releases shall be tested to ensure that it meets the
requirements as specified in 3.5.19.4.1. Time delay shall be measured from the time that voltage signal goes to zero
to the first indication of circuit breaker opening.
4.5.8 Auxiliary switch rating. One "a" (normally closed) auxiliary switch shall have rated voltage and current
applied in accordance with 3.5.19.6. The current and voltage shall be applied for the duration of the circuit breaker
pre-interruption temperature rise test. There shall be no pitting or burning noted on the auxiliary switch at the end of
the test.
4.5.9 Endurance.
4.5.9.1 Circuit breakers. Circuit breakers shall be subjected to endurance tests of 4.5.9.1.1 and 4.5.9.1.2 without
failure or operating irregularities. At the completion of each endurance test, the circuit breakers shall be closely
examined to identify any evidence of undue wear or development of operating irregularities in any part.
4.5.9.1.1 Mechanical endurance test.
4.5.9.1.1.1 Test set-up and method of cycling. No current shall be applied to the circuit breaker primary studs.
Close-open operation shall be accomplished by the manual operating mechanism on all circuit breakers.
4.5.9.1.1.2 Number and rate of operations. The circuit breaker shall be operated mechanically at any
convenient speed for 4000 close-open cycles unless otherwise specified in the applicable specification sheet (see
3.1).
4.5.9.1.2 Electrical endurance test.
4.5.9.1.2.1 Test set-up and method of cycling. Rated voltage, current, and frequency shall be applied as
specified in the applicable specification sheet (see 3.1). Power factor lagging for AC circuits shall be 0.75 to 0.8.
Close-open operation shall be accomplished using applicable attachments (see 4.5.9.2). DC circuits shall have a
resistive load.
4.5.9.1.2.2 Number and rate of operations. The circuit breaker shall be operated electrically for the number of
close-open operations and at the rate of operations specified in the applicable specification sheet (see 3.1).
4.5.9.2 Attachments. Applicable attachments shall be used to cycle the circuit breaker during electrical
endurance. Rate of operations as specified in the applicable specifications sheets (see 3.1) for the circuit breaker
electrical endurance shall be maintained.
4.5.9.2.1 Electric operating mechanism. Electric operating mechanism shall close and reset the circuit breaker
for the number of operations specified in Table II.
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