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MIL-DTL-17361 Circuit Breaker Types Aqb/Nqb, Air, Electric, Low Voltage, Insulated Housing \(Shipboard Use\), General Specification ForSets forth, for use by qualified personnel, a number of basic procedures that may be used for the inspection and preventive maintenance of molded case circuit breakers used in industrial and commercial applications rated up to and including 1000 V 50/60 Hz AC or AC/DC.

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MIL-DTL-17361G(SH)
TABLE II. Electric operating mechanism operational requirements.
DC
AC, 60 Hz
AC, 400 Hz
Endurance
Nominal
Voltage
Nominal
Voltage
Nominal
Voltage range
voltage
range
voltage
range
voltage
120
70­140
115
90­130
115
90­130
4000
250
140­280
450
360­500
4000
3.5.19.4 Undervoltage release devices. An undervoltage release device shall be mounted within the circuit
breaker when specified (see 3.1 and 6.2) and shall have the following characteristics:
a.  The device shall meet the applicable operational requirements shown in Tables III (a) and III (b). The
specified pickup (see 6.4.18) and seal voltages apply to cold coil (room temperature). AC voltages are applicable to
60-Hz circuits only.
b.
The device shall be simple and compact.
c.  The device shall be capable of being continuously energized at its rated voltage and shall operate directly
on the circuit breaker tripping mechanism.
d.  The device shall automatically reset; that is, after it has dropped out and tripped the circuit breaker on
reduced voltage, it shall be reset by the circuit breaker action upon restoration of voltage to pickup value.
e.  Connecting leads, adequately marked, shall extend from the back, end, or sides of the circuit breaker
enclosure for a minimum of 30 inches.
f.
Coil and connecting leads of each device shall be fully insulated without exposed terminals or connection.
TABLE III (a). Undervoltage release device operational requirements (field replaceable).
Nominal
Voltage
Pickup and
Dropout
Maximum power watts
Endurance
voltage
range
seal V
voltage
33 DC
26.4­36.3
22
12­8
2.7
2500
120 DC
95­140
95
80­10
2.7
2500
115 AC
90­135
90
80­10
18.0
2500
450 AC
360­520
360
290­45
18.0
2500
TABLE III (b). Undervoltage release device operational requirements (not field replaceable).
Nominal
Voltage
Pickup and
Dropout
Maximum power watts
Endurance
voltage
range
seal V
voltage
120 DC
95­140
95
80­10
12.0
2500
250 DC
175­355
150
100­10
12.0
2500
115 AC
90­135
90
80­10
18.0
2500
450 AC
360­520
360
270­45
18.0
2500
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