MIL-PRF-55629E
APPENDIX A
PROCEDURE FOR QUALIFICATION INSPECTION
A.1 SCOPE
A.1.1 Scope. This appendix details the procedure to submit samples, with related data, for qualification inspection
of circuit breakers covered by this specification. The procedure shall be applicable to each circuit breaker
configuration for which qualification is sought. The procedure for extending qualification of the required sample to
other circuit breakers covered by this specification is also included.
A.2 APPLICABLE DOCUMENTS
This section is not applicable to this appendix.
A.3 SUBMISSION
A.3.1 Sample for specification sheet 1 through sheet 12 (tripping time delay A through delay S). Unless otherwise
specified, 42 sample circuit breakers for each specification sheet for which qualification is sought, shall be submitted.
When qualification is sought for two circuit breakers covered by two specification sheets that are identical, except that
one covers circuit breakers with auxiliary contact terminals and the other covers circuit breakers without auxiliary
contact terminals, the former shall be submitted. The 42 sample units shall be composed of six groups of seven units
each (see A.3.3).
Two of the 7-unit groups shall be of the highest current rating and one 7-unit group shall be of the lowest current
rating. The other three 7-unit groups may be composed of the highest or lowest current rating at the option of the
contractor; however, the sample units within each 7-unit group shall be either all of the highest current rating or all of
the lowest current rating. Each 7-unit group shall be composed of one each circuit breaker of the seven voltage-
frequency-time delay combinations, A through G or K through S (see A.4.1). No failures will be allowed in the 42
sample units.
(Tripping time delay H, delay I, and delay J) When qualification already exists for characteristic A through
characteristic G, six circuit breakers shall be submitted for qualification to characteristic H, characteristic I, and
characteristic J. They shall consist of two circuit breakers (one in the minimum and one in the maximum current
rating) in each of the three characteristics. The sample units shall be of the greatest number of poles for which
qualification is sought. Circuit breakers qualified with auxiliary contacts will convey qualification to specification
sheets without auxiliary contacts. Tests to be conducted are: Calibration, resistance or impedance (all units); high-
temperature and low-temperature operation (2 units); vibration (2 units); and shock (2 units). No failures will be
allowed in the six sample units.
(Tripping time delay T.) When qualification already exists for characteristic K through characteristic S, two circuit
breakers shall be submitted for qualification to characteristic T. They shall consist of one in the minimum and one in
the maximum current rating. The sample units shall be of the greatest number of poles for which qualification is
sought. Circuit breakers qualified with auxiliary contacts will convey qualification to specification sheets without
auxiliary contacts. Tests to be conducted are calibration and high-temperature and low-temperature. No failures will
be allowed.
When qualification currently exist for specification sheet 1 through sheet 6 in tripping time delay A through delay G,
qualification for the high-inrush feature (tripping time delay K through delay S) may be gained by submitting six circuit
breakers represented by the lowest and highest current rating in each tripping time delay L, delay N, and delay R.
Tests and sequence to be conducted are: Three high current sample units; shock, salt atmosphere, calibration (high
inrush, 125 percent or 150 percent (see 3.1) and 1,000 percent). Three low current sample units; vibration, high and
low temperature, and while being held at each temperature, perform high inrush, 125 percent or 150 percent (see
3.1) and 800 percent calibration.
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