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. VERIFICATION

4.1 Classification of inspection. The inspection requirements specified herein are classified as follows:

Qualification inspection (see 4.4).

Verification of qualification (see 4.5)

Conformance inspection (see 4.6).

Periodic group B inspection (see 4.7).

4.2 Test equipment and inspection facilities. The manufacturer shall establish and maintain a calibration system in

accordance with NCSL-Z540.3, ISO 10012, or equivalent system as approved by the qualifying activity.

NOTE: All views are rear face of circuit breaker with keyway up.

FIGURE 1. Terminal symbols and identification numbers.

4.3 Inspection conditions. Unless otherwise specified herein, all inspections shall be performed in accordance with

the test conditions specified in the "GENERAL REQUIREMENTS" of MIL-STD-202.

4.3.1 Power supply. Unless otherwise specified herein, the power supply shall have no more than 10 percent

regulation at twice the specified load current. A dc power supply shall have no more than 5 percent voltage ripple.

An ac power supply shall be within 1 percent of the specified frequency and shall be sinusoidal with a form factor

between 0.95 and 1.25.