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

FIGURE 3. Suggested test jig for panel seal test.

4.8.11 Endurance (see 3.14). Circuit breakers shall be subjected to 10,000 mechanically performed make and

break operations with the circuit breaker energized to 100 percent of rated current, at 240 V ac, 400 Hz throughout

the cycling period, at a rate not to exceed six operations per minute. Circuit breakers shall be continuously monitored

and recorded to determine whether any contact has failed to open or close its individual circuit in the proper

sequence. Half of the sample units shall be tested with the specified inductive load and half with the specified

resistive load (see 4.8.11.1).