MIL-DTL-17587C(SH)
x. Requirements for rework and suspension of shipment of circuit breakers when circuit breakers do not meet
acceptance criteria (see 4.3.2).
Packaging requirements (see 5.1).
y.
Provisioning requirements (see 6.4).
z.
6.3 Definitions. Circuit breaker terminology used in this specification is in accordance with common
commercial technology, except as noted below. Commonly used terms can be found in ANSI C37.100.
6.3.1 By-pass switch. The by-pass switch is comprised of a normally closed limit switch (cell switch) mounted
on the cradle and connected to the stationary secondary contacts in parallel with a normally closed auxiliary switch.
6.3.2 Cell switch. A cell switch is a normally closed limit switch mounted on the cradle that opens when the
circuit breaker is in the connect or test position and closes when the circuit breaker is in the disconnect or withdrawn
position.
6.3.3 Charging motor. A charging motor is the motor which moves the closing spring or springs to the position
necessary, so that the spring(s) has (have) sufficient force to close the circuit breaker.
6.3.4 Closing release. A closing release is an electrical or mechanical device which releases the charged
springs to close the circuit breaker contacts.
6.3.5 Closing spring. A closing spring is a spring that supplies power for closing the circuit breaker.
6.3.6 Enclosure. See MIL-STD-108.
6.3.7 Hold-closed mechanism. A hold-closed mechanism is a mechanism which renders the trip device and
trip-free mechanism ineffective, thus permitting the circuit breaker to be closed from the open position or be held
closed when in the closed position against an overload, as long as the hold-closed device is held in position by the
operator.
6.3.8 Lockout mechanism. A lockout mechanism mechanically prevents the circuit breaker from closing,
either electrically or manually.
6.3.9 Operating mechanism of a circuit breaker. The operating mechanism of a circuit breaker is a power-
operating or manual mechanism, by which the contact of all poles of the circuit breaker is actuated.
6.3.10 Operating time of a circuit breaker. The operating time of a circuit breaker is the total time interval of
elapsed time, from the moment of energizing the circuit breaker's trip coil to the completion of the interruption of
the circuit at rated voltage.
6.3.11 Overcurrent device. An overcurrent device is an assembly which detects a current exceeding a
predetermined value and which will directly initiate an operation or the circuit breaker trip mechanism.
6.3.12 Overcurrent coil. Overcurrent coil is a thermal or magnetic overcurrent device.
6.3.13 Overcurrent sensors. Overcurrent sensors are elements associated with electrical overcurrent trip
devices, which sense current magnitude and supply a corresponding signal to an electrical network.
6.3.14 Pickup setting. The average minimum current required to activate a trip element between 30 and 70 °C
ambient temperature.
6.3.15 Rated AC short-circuit current. The rated AC short-circuit current of a circuit breaker is the stated limit
of available (prospective) current, at which it is required to perform its short-circuit current duty cycle at rated
maximum voltage and frequency under the prescribed test conditions.
6.3.16 Rated continuous current. The rated continuous current of a circuit breaker is the stated limit in rms
amperes at rated frequency, or DC amperes, which a circuit breaker will carry continuously under stated ambient
conditions without either tripping or exceeding the limit of observable temperature rise.
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