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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
4.8.12 Terminal strength (see 3.15). Circuit breakers shall be tested in accordance with method 211 of
MIL-STD-202. The following details and exceptions shall apply.
a.
Test condition: A.
b.
Applied force: Main contact terminals: 4 1/2 pounds. Auxiliary contact terminals: 2.
c.
Direction of force: Parallel to the longitudinal axis of the terminal, perpendicular to the longitudinal axis of the
terminal, or in any other direction deemed most likely to cause failure. However, no terminal shall be tested in
more than one direction.
d.
Examinations after test: Circuit breakers shall be subjected to the seal test (see 4.8.8), and shall be examined
to verify compliance with 3.15.
4.8.13 Vibration, high frequency (see 3.16). Circuit breakers shall be tested in accordance with method 204 of
MIL-STD-202. The following details and exceptions shall apply.
a.
Tests and measurements prior to vibration: Not applicable.
b.
Test condition: C.
c.
Mounting method: Normal mounting means.
d.
Electrical load conditions: Half the circuit breakers shall be tested with the main contacts closed, while
energized at 100 percent of rated current, at 12 volts dc. The other half of the circuit breakers shall be tested
with the main contacts open and unenergized.
e.
Measurements during vibration: Each circuit breaker shall be monitored to determine opening or closing of
contacts in the "on" and "off" position.
f.
Examination after vibration: Circuit breakers shall be examined for evidence of mechanical and electrical
damage.
4.8.14 Moisture resistance (see 3.17). Circuit breakers shall be tested in accordance with method 106 of
MIL-STD-202. The following details and exceptions shall apply.
a.
Mounting: Mounted horizontally on a nickel plated brass panel.
b.
Initial measurements: Immediately following the initial drying period, resistance or impedance shall be
measured as specified in 4.8.5.
c.
Electrical load conditions: During the first 2 hours of step 1 and step 4, circuit breakers shall be energized at
rated current and at the applicable frequency (see 3.1).
d.
Steps 7a and 7b are not applicable.
e.
Final measurements: Upon completion of the 10th cycle and while still in the humidity chamber, insulation
resistance and resistance or impedance shall be measured as specified in 4.8.4 and 4.8.5 respectively. After
the 24 hour drying period, insulation resistance shall again be measured as specified in 4.8.4.
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