MIL-DTL-17587C(SH)
4.5.3.2 Electric closing device voltage range/characteristics.
4.5.3.2.1 Operating voltage range/closing time. With the circuit breaker initially in the open position, the rated
minimum, nominal, and maximum operating voltages in the specified range shall be applied to the electric closing
device during three separate checks. The electric closing device shall reclose the circuit breaker during each check.
Closing time shall not exceed ½ second during any check. Closing time shall be measured from the initial rise in the
close signal voltage to the first indication of continuity across the circuit breaker poles.
4.5.3.2.2 Charging mechanism stall test. The circuit breaker shall be electrically operated by reducing the
charging mechanism operating voltage below the rated minimum voltage in increments of 2 volts until the charging
mechanism fails to operate. This voltage shall be held for 15 seconds and it shall be verified that the circuit breaker
is not damaged and does not become misaligned in any of its parts.
4.5.3.3 Undervoltage release.
4.5.3.3.1 Operating voltage range. With the circuit breaker in the closed position, the rated minimum, nominal,
and maximum operating voltage in the specified range shall be applied to the undervoltage release device during
three separate checks. The circuit breaker shall not open during any check.
4.5.3.3.2 Dropout voltage range. With voltage applied in the specified dropout range, the undervoltage release
shall trip the circuit breaker. It shall then be verified that the circuit breaker shall not have the ability to be reclosed
while applied voltage is in the specified dropout range.
4.5.3.4 Shunt trip voltage range/tripping current. With the circuit breaker in the closed position, the rated
minimum, nominal, and maximum rated operating voltage in the specified range shall be applied to the shunt trip
device during three separate checks. The circuit breaker shall trip during each check. For the 20S DC shunt trip, the
tripping current shall be measured to verify that it does not exceed 30A at the maximum voltage.
4.5.3.5 Indicator light, operations counter, mechanical position indicator, and auxiliary switch operation. The
circuit breaker shall be cycled electrically and the following criteria met:
a. The indicator lights shall be visually verified to have illuminated as specified when the circuit breaker is in
the closed and open positions.
b. The operations counter shall be visually verified to have advanced as the circuit breaker is cycled.
c. The mechanical position indicator shall be visually verified to have shown the proper position of the main
contacts (open/closed) as the circuit breaker is cycled.
d. One "a" (normally closed) and one "b" (normally open) auxiliary switch shall be verified by measurement to
have changed state with the circuit breaker main contacts when the circuit breaker is cycled.
4.5.3.6 Operation of cell switch and rack-in/rack-out position indicator. The following criteria shall be met:
a. The cell switch shall be verified by measurement to be in the open position.
b. It shall be verified that the rack-in/rack-out position indicator shows that the circuit breaker is in the connect
position.
4.5.3.7 Trip on power up (TOPU) device operation and control power removal/reapplication. Circuit breakers
with electronic trip devices and a TOPU or similar device, shall undergo the tests of 4.5.3.7.1, 4.5.3.7.2, and
4.5.3.7.3. Electronic circuit breakers without a TOPU or similar device shall undergo the tests of 4.5.3.7.1 and
4.5.3.7.3. All undervoltage release/lockout devices shall be removed/defeated prior to testing.
4.5.3.7.1 TOPU device turned off (if applicable) and circuit breaker closed. With control power initially
applied, remove control power to the circuit breaker and then reapply control power after 15 seconds. Circuit
breaker shall not open or trip. Repeat this sequence twice more.
4.5.3.7.2 TOPU device turned on (if applicable) and circuit breaker closed.
4.5.3.7.2.1 15-second test. With control power initially applied, remove control power to the circuit breaker
and then reapply control power after 15 seconds. Circuit breaker shall open without intentional delay. Repeat this
sequence twice more.
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