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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
4.6 Conformance inspection.
4.6.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A inspection.
4.6.1.1 Inspection lot. An inspection lot shall consist of all the circuit breakers covered by a single specification
sheet produced under essentially the same conditions, and offered for inspection at one time. In addition, circuit
breakers, similar in design and number of poles except for the presence of auxiliary contact terminals, may be
combined to form a lot, provided that a proportional quantity of a sample units with and without auxiliary contact
terminals are incorporated into the sample.
4.6.1.1.1 Group A inspection. Group A inspection shall consist of the examinations and tests specified in table V.
4.6.1.1.1.1 Sampling plan. Group A inspection shall be on an inspection lot basis. Samples shall be selected in
accordance with table VI, based on the inspection lot. If there are one or more failures, the inspection lot shall be
considered to have failed.
4.6.1.1.2 Rejected lots. If an inspection lot is rejected, the supplier may rework the lot to correct the defects or 100
percent inspect the lot and remove all defective parts. Reworked lots shall be resubmitted for inspection. Such lots
shall be separated from new lots and shall be clearly identified as reinspected lots. If one or more defects are found
in this second sample, the lot shall be rejected and shall not be supplied to this specification.
4.6.1.1.3 Disposition of sample units. Sample units which have passed all the group A inspection may be
delivered on the contract or order if the lot is accepted and the sample units are still within specified electrical
tolerances.
TABLE V. Group A inspection.
Inspection
Requirement
Test method
paragraph
paragraph
Marking
Workmanship
Dielectric withstanding voltage
Insulation resistance
Calibration
Seal
TABLE VI. Group A, zero defect sampling plan.
Lot size
Sample size
1 -
13
100 percent
14 -
150
13
151 -
280
20
281 -
500
29
501 -  1,200
34
1,201 -  3,200
42
3,200 - 10,000
50
10,001 - 35,000
60
35,001 - 150,000
74
150,001 - 500,000
90
500,001 and up
102
13



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