MIL-DTL-17587C(SH)
c. The closing time, with rated voltage applied, shall not exceed 0.5 second.
d. The device to charge a stored energy system shall be able to sustain an undervoltage condition for 15
seconds without sustaining damage or a need for realignment.
e. All wiring and control devices necessary for electric operation, including rectifiers used to supply closing
energy, shall be installed on the circuit breaker. A transformer, when necessary for reducing a circuit breaker's
control voltage, may be mounted on the rear of the cradle or supplied loose for mounting in the circuit breaker's
enclosure, as specified (see 6.2).
TABLE II. Voltages for electric closing mechanisms.
Direct current
Alternating current
Nominal voltage
Nominal voltage
Operating voltage
Operating voltage
range (volts)
range (volts)
120
90130
120
90135
250
175355
450
360500
3.4.17.4 Undervoltage release device. When specified (see 6.2), an undervoltage release device shall be
provided and shall have the following characteristics:
a. The device shall be simple and compact without intentional time delay, other than filtering that may be
required to eliminate nuisance in tripping for electronic undervoltage release devices, and shall be connected to
either the line or load terminals.
b. The device shall have a continuous duty rating and shall operate directly on the trip mechanism of the circuit
breaker.
c. The nominal voltages and operating voltage ranges shall be as specified in Table III. The specified pickup
voltages shall apply to a cold coil (approximately 25 °C).
d. The device shall automatically reset; after it has dropped out and tripped the circuit breaker on reduced
voltage, it shall reset automatically on restoration of voltage to the pickup level. The reset may be electrical or
mechanical by circuit breaker action.
e. When the device is mounted in the open, at the front of the circuit breaker, the device and connecting wires
shall be fully insulated without exposed terminals and connections. The word "DANGER" shall be marked in red
on the device.
TABLE III. Voltages for undervoltage release devices.
Nominal voltage
Operating voltage range
Pickup volts (maximum)
Dropout voltage range
250 DC
175355
175
10025
450 AC
360500
360
29045
120 AC
90135
90
Above 15
3.4.17.5 Undervoltage lockout device. When specified (see 6.2), the undervoltage lockout device shall be
capable of continuous energization. When energized, the lockout device shall not affect the circuit breaker
operation. The lockout device shall not trip a closed circuit breaker. It shall prohibit closing of an open circuit
breaker when de-energized.
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