MIL-DTL-17587C(SH)
4.5.3.7.2.2 20-millisecond test. With control power initially applied, remove control power to the circuit
breaker and then reapply control power after 20 milliseconds. Circuit breaker shall not open. Repeat this sequence
twice more.
4.5.3.7.3 TOPU device turned off (if applicable) and circuit breaker open. With control power initially applied,
remove control power to the circuit breaker and then reapply control power after 15 seconds. Circuit breaker shall
not close. Repeat this sequence twice more.
4.5.3.8 Hold-closed mechanism. The following tests shall be conducted:
a. With the circuit breaker initially in the open position, demonstrate that the hold-closed mechanism will
permit closing of the circuit breaker.
b. With the circuit breaker initially in the closed position and an electrical trip signal applied, demonstrate that
the hold-closed mechanism will keep the circuit breaker closed.
4.5.3.9 Auxiliary switch and associated secondary disconnecting device rating verification. One "a" (normally
closed) auxiliary switch and its associated secondary disconnecting device contact shall have rated voltage and
current applied in accordance with 3.4.17.7.d. The current and voltage shall be applied for the duration of the circuit
breaker pre-interruption temperature rise test at rated current and the post-interruption temperature rise test at rated
current. There shall be no pitting or burning noted on the auxiliary switch at the end of the test.
4.5.4 Trip-free operation and anti-pump operation.
4.5.4.1 Mechanical. The following tests shall be performed:
a. With the circuit breaker closed, press and hold the manual open (trip) button; the circuit breaker shall open.
Then press and hold the close button; the circuit breaker contacts shall not close, even momentarily. The lack of a
contact closure shall be verified with an appropriate detection circuit and oscilloscope connected across the main
contacts.
b. With the circuit breaker open and the open (trip) button held, apply and remove the electrical close signal;
the circuit breaker contacts shall not close, even momentarily. The lack of a contact closure shall be verified with an
appropriate detection circuit and oscilloscope connected across the main contacts.
c. With the circuit breaker open, press and hold the close button; the circuit breaker shall close. While holding
the close button, press and release the open (trip) button; the circuit breaker shall open and remain open.
d. Release the close button and then press it again; the circuit breaker shall close and remain closed.
4.5.4.2 Electrical. The following tests shall be performed:
a. Apply control power to the circuit breaker. With the circuit breaker closed, apply and maintain an open
(trip) signal to the breaker; the circuit breaker shall open.
b. With the open signal still applied, apply a close signal to the circuit breaker; the circuit breaker shall not
close. During this test it is acceptable if the circuit breaker main contacts and auxiliary contacts make contact
momentarily.
c. With the circuit breaker open, apply and maintain a close signal to the circuit breaker; the circuit breaker
shall close. While maintaining the close signal, apply and remove an open signal; the circuit breaker shall open and
remain open.
d. Remove the close signal and re-apply; the circuit breaker shall close and remain closed.
4.5.5 Circuit breaker positions in or on cradle for rack-in/rack-out.
4.5.5.1 Rack-out. With the circuit breaker initially in the connect position and closed, the circuit breaker shall
then be racked-out to the test, disconnect, and withdrawn positions and meet the criteria of 4.5.5.1.1, 4.5.5.1.2, and
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