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MIL-PRF-39019 Circuit Breakers, Magnetic, Low-Power Sealed, Trip-Free General Specification ForThis specification covers the requirements and test procedures for single and multipole, trip-free, sealed, low-power, magnetic circuit breakers with current ratings of 0.050 amperes to 20.0 amperes inclusive, up to and including 240 volts, 60 hertz \(Hz\) and 400 Hz alternating current \(ac\), and 50 volts direct current \(dc\) \(see 6.1 and 6.7\). These circuit breakers may also include auxiliary contacts \(see 6.6.1\) and terminals for monitoring circuits. Designers are CAUTIONED that these circuit breakers may contain a pure tin finish on some of the component parts \(see 6.5\).

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MIL-PRF-39019F
3.8 Resistance or impedance. Circuit breakers shall be tested as follows:
Main contacts: When circuit breakers are tested as specified in 4.8.5a, the resistance or impedance of the
a.
main contacts shall not exceed the maximum values specified (see 3.1).
Auxiliary contacts: When circuit breakers are tested as specified in 4.8.5b, the initial contact resistance shall
b.
not exceed 0.1 ohm.
3.9 Calibration. When circuit breakers are tested as specified in 4.8.6, the tripping times (see 6.6.6) shall not
exceed the limits shown in table I for the applicable time delay specified (see 3.1 and 6.6.5). In multipole circuit
breakers, all poles shall trip upon application of overload on any pole or combination of poles. When tested for high
inrush, circuit breakers shall not trip.
3.10 Actuating lever (see 4.8.7).
3.10.1 Lever strength. When circuit breakers are tested as specified in 4.8.7.1, there shall be no evidence of
mechanical damage.
3.10.2 Lever operating force. When circuit breakers are tested as specified in 4.8.7.2, the applied force necessary
to operate the lever in either direction shall not exceed the following:
One-pole breaker
-
4 pounds.
Two-pole breaker
-
7 pounds.
Three-pole breaker
-
10 pounds.
3.11 Seal. When circuit breakers are tested as specified in 4.8.8, there shall be no visible air bubbles indicative of
leakage.
3.12 Panel seal. When circuit breakers are tested as specified in 4.8.9, there shall be no visible air bubbles
indicative of leakage.
TABLE I. Calibration tripping times (seconds) at 25°C ±2°C.
Percent of
Time delay A
Time delay B
Time delay C
rated current
(fast)
(slow)
(nondelay)
Min
Max
Min
Max
Min
Max
No trip
No trip
No trip
No trip
No trip
100
No trip
1 hour
1 hour
1 hour
1 hour
1 hour
1 hour
60.0
0.1
3.0
N/A
7.0
135
0.2
9.0
0.05
0.5
N/A
0.95
200
0.055
Inst 1/
1.75
N/A
Inst
N/A
0.24
400
Inst
0.6
N/A
Inst
N/A
0.13
600
0.1 2/
Inst
N/A
Inst
N/A
0.06
800
800 at 60 Hz and dc 3/
No trip
No trip
N/A
No trip
N/A
No trip
1400 at 400 Hz 3/
No trip
No trip
N/A
No trip
N/A
No trip
1/ Instantaneous (Inst) is defined as less than 0.015 second.
2/ This time is extended to 0.3 second for dc and 400 Hz when the high inrush design is incorporated.
3/ This test applicable only to breakers with high inrush design. See 3.9 and 4.8.6 for requirements.
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