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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
3.13 High temperature and low temperature operation. When circuit breakers are tested as specified in 4.8.10,
there shall be no evidence of mechanical damage and tripping time shall not exceed the limits shown in table II for
the applicable time delay specified (see 3.1). Circuit breakers shall also meet the following requirements when tested
under the conditions specified in 4.8.10.
Dielectric withstanding voltage (see 3.6).
a.
b.
Insulation resistance (see 3.7).
Seal (see 3.11).
c.
d.
Panel seal (see 3.12).
TABLE Il. High-temperature and low-temperature tripping times (seconds).
Percent of
Time delay A
Time delay B
Time delay C
rated current
(fast)
(slow)
(nondelay)
-40°C ±2°C  +100°C ±2°C
-40°C ±2°C
+100°C ±2°C
-40°C
+100°C
±2°C
±2°C
Max
Min
Max
Min
Max
Min
100
No trip
No trip
No trip
No trip
No trip
No trip
1 hour
1 hour
1 hour
1 hour
1 hour
1 hour
135
400.0
0.10
500.0
0.4
50.0
N/A
150 1/
800.0
N/A
1,000.0
N/A
25.0
N/A
200
5.0
0.015
25.0
0.04
5.0
N/A
Inst 2/
400
0.7
10.0
Inst
N/A
N/A
Inst
600
0.5
2.0
Inst
N/A
N/A
0.1 3/
Inst
800
0.06
Inst
N/A
N/A
800 at 60 Hz and dc 4/
No trip
No trip
No trip
No trip
N/A
N/A
1400 at 400 Hz 4/
No trip
No trip
No trip
No trip
N/A
N/A
1/
This test performed at -55°C ±2°C.
2/
Instantaneous (Inst) is defined as less than 0.015 second.
3/
This time is extended to 0.3 second for dc and 400 Hz when the high inrush design is incorporated.
4/
This test applicable only to breakers with high inrush design.
3.14 Endurance. When circuit breakers are tested as specified in 4.8.11, no contact shall fail to open or close its
individual circuit in proper sequence and there shall be no evidence of mechanical damage or loosening of parts.
Circuit breakers shall also meet the following requirements.
a.
Dielectric withstanding voltage (see 3.6).
b.
Insulation resistance (see 3.7).
Calibration (see 3.9).
c.
d.
Seal (see 3.11).
e.
Auxiliary contact resistance (see 4.8.5b): Contact resistance shall not exceed 0.4 ohm.
6



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