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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

4.7.1.2 Group A inspection. Group A inspection shall consist of the inspections specified in table III.

4.7.1.2.1 Sampling plan. Group A inspection shall be on an inspection lot basis. Samples shall be selected in

accordance with table IV, based on the inspection lot. If there are one or more failures, the inspection lot shall be

considered to have failed.

TABLE III. Group A inspection.

Inspection

Requirement

Test method

paragraph

Marking

3.25 through 3.25.2

Workmanship

3.27

Dielectric withstanding voltage

3.7

4.8.3

Insulation resistance

3.8

4.8.4

Calibration (mounted in the

3.9

4.8.5.2

vertical plane only)

4.7.1.2.2 Rejected lots. The rejected lots shall be segregated from new lots and those lots which have passed

inspection. The supplier may rework it to correct the defect or 100 percent inspect the lot and remove all defective

parts. The rejected lot shall then be inspected in accordance with table IV for those quality characteristics found

defective in the sample. If one or more defects are found in this second sample, the lot shall be rejected and shall not

be supplied to this specification.

4.7.1.2.3 Disposition of sample units. Sample units which have passed all the group A inspections may be

delivered on the contract or order, if the lot is accepted and the sample units are still within specified electrical

tolerances.

TABLE IV. Group A zero defect sampling plan.

Lot size

Sample size

100 percent

150

151

280

281

500

501

1,200

1,201

3,200

3,201

10,000

10,001

35,000

35,001

150,000

150,001

500,000

500,001

and up

102

4.8 Methods of examination and test.

4.8.1 Visual and mechanical inspection. Circuit breakers shall be examined to verify that dissimilar metals,

interface, physical dimensions, marking, and workmanship are in accordance with the applicable requirements. (see

3.1, 3.4 to 3.5.14 inclusive, and 3.27).

4.8.2 Solderability (see 3.6). Circuit breaker solder terminals shall be tested in accordance with method 208 of

MIL-STD-202. The following detail and exception shall apply:

Number of terminations to be tested - Solder or tab type.

Examination of terminations - Method for evaluation of lugs and tabs shall apply.