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MIL-PRF-55629 Circuit Breakers, Magnetic, Unsealed Or Panel Seal, Trip-Free, General Specification ForThis specification covers the requirements and test procedures for single and multipole, trip-free, unsealed, magnetic circuit breakers with current ratings of 0.2 amperes to 100 amperes inclusive, up to and including 240 volts, 400 Hertz, 480 volts, 60 Hertz alternating current \(ac\) and 125 volts direct current \(dc\), \(see 6.1\). These circuit breakers may also include auxiliary contacts \(see 6.6.1\) for monitoring circuits. A voltage sensitive pole is also available in a four pole device. Panel seal mounts are available in 0.2 amperes through 50 amperes. Designers are WARNED 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-55629E
Group VI
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One 7-unit group covering the highest current rating and one 7-unit group covering
the lowest current rating.
(For inspection routine of tripping time delays H, I, and J, see A.3.1).
TABLE I. Qualification inspection.
Requirement
Test
Inspection
paragraph
method
paragraph
Group I (all sample units) 1/
Visual and mechanical inspection 2/
inclusive, 3.26
Solderability (applicable to solder terminals)
(3 sample units only)
Dielectric withstanding voltage 3/
Insulation resistance
Calibration
Resistance or impedance
Actuator strength (2 sample units only)
Group II
High-temperature and low-temperature
operation 4/
Endurance 3/
Actuator operating force
(2 sample units only)
Group III
Terminal strength
Mounting strength
Vibration
Moisture resistance
Group IV
Thermal shock
Shock
Moisture resistance
Group V 5/
Trip-free calibration 3/
Salt atmosphere (corrosion)
Group VI
Temperature rise 3/
Interrupting capacity 3/
Panel seal (2 sample units only) 5/
1/ Nondestructive inspections and tests.
2/ Dimensional measurements may be made on two units only.
3/ This test is not required for initial qualification when documentation in the form of the UL engineering report in
accordance with UL 489 or UL 1077 or both is furnished.
4/ When applicable (see 3.1).
5/ After completion of group V tests, one circuit breaker of the group shall be opened and examined internally in
accordance with 4.8.1.
4.4.3 Failures. One or more failures shall be cause for refusal to grant qualification approval.
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