MIL-DTL-17587C(SH)
3.4.10.3.3 Application points on charging motor control wiring, circuit breaker poles, and ground. Insulation
in as-new condition shall be able to withstand without breakdown a 60 Hz voltage of 900 volts for a period of 1
minute when applied in accordance with 4.5.10. As circuit breakers and attachments are cycled and tested for
qualification, dielectric strength requirements at 60 percent of values listed above may apply. See 4.5.10 for these
test requirements.
3.4.10.4 Insulation resistance. With insulation in as-new condition, insulation resistance shall be greater than
10 megohms between all measuring points of 4.5.11. As circuit breakers are cycled and tested for qualification,
insulation resistance values of greater than 1 megohm may apply. See 4.5.11 for these test requirements.
3.4.11 Withdrawal interlock mechanism. Circuit breakers shall be provided with an interlock device which
prevents the circuit breaker from being withdrawn or inserted in the closed position.
3.4.12 Circuit breaker positions in or on cradle for rack-in/rack-out. Circuit breaker/cradle configurations
provided with connect, test, disconnect, and withdrawn positions or any combination thereof shall meet the
applicable requirements of this section. Unless otherwise specified herein, these requirements shall be met with the
circuit breaker/cradle configuration permanently in the normal vertical/horizontal orientations and inclined in any
direction to a 30-degree maximum position from the normal vertical/horizontal orientations. The available
positions and any exceptions to the requirements above shall be specified or addressed in the qualification package.
3.4.12.1 Connect position. In the connect position, the circuit breaker shall operate manually and electrically
and the circuit breaker main contacts and control circuitry shall be energized.
3.4.12.2 Test position. In the test position, the circuit breaker shall operate manually and electrically without
energizing the circuit breaker main contacts. Control circuitry shall remain energized.
3.4.12.3 Disconnect position. In the disconnect position, the circuit breaker main contacts and control
circuitry shall not be energized. The circuit breaker shall operate manually.
3.4.12.4 Withdrawn position. In the withdrawn position, the circuit breaker is fully extended on the cradle
rails/tray. The circuit breaker main contacts and control circuitry shall not be energized. The circuit breaker shall
operate manually. The cradle shall be subjected to the cradle strength test of 4.5.5.1.3.3 with the circuit breaker in
the normal vertical/horizontal orientation.
3.4.12.5 Anti-rolling/retention in the test, disconnect, and withdrawn positions. The circuit breaker shall not
come off the cradle rails/tray when subjected to tests specified herein. The circuit breaker shall come off the cradle
rails/tray and no part of the circuit breaker shall come off the cradle rails/tray in such a manner as to require manual
repositioning of the circuit breaker. Manual or automatic means may be used to prevent the circuit breaker from
moving.
3.4.13 Operating mechanisms. (see 6.3.9)
3.4.13.1 Simultaneous operation. All poles of the circuit breaker shall be operated from a common shaft.
3.4.13.2 Closing.
3.4.13.2.1 Manual closing. All circuit breakers shall be provided with handles for manual operation as
specified (see 6.2). The handles shall be adaptable for dead-front, flush-mounted circuit breaker applications. The
force necessary to manually operate the circuit breakers shall not exceed that which can be quickly and readily
exerted by a human operator. When the handle is used to charge a closing spring, the position of the charging
spring shall be readily discernible.
3.4.13.2.2 Electric closing. Circuit breakers shall be electrically operated by means of electric closing
devices. See 3.4.17.3 for requirements.
3.4.13.3 Trip-free. Circuit breakers shall be mechanically and electrically trip-free in any position and under
all conditions of operation. The presence of a trip condition shall always and under any and all conditions, override
actions to close the circuit breaker and result in tripping the circuit breaker.
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