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MIL-DTL-17361 Circuit Breaker Types Aqb/Nqb, Air, Electric, Low Voltage, Insulated Housing \(Shipboard Use\), General Specification ForSets forth, for use by qualified personnel, a number of basic procedures that may be used for the inspection and preventive maintenance of molded case circuit breakers used in industrial and commercial applications rated up to and including 1000 V 50/60 Hz AC or AC/DC.

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MIL-DTL-17361G(SH)
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
Qualification inspection (see 4.2).
b.
Comparison inspection (see 4.3).
c.
Conformance inspection (see 4.4).
4.2 Qualification inspection of AQB circuit breakers, mounting bases/blocks, fuses, fuse units and attachments.
Qualification inspection shall consist of the examination and tests in the order specified in Tables V and VI. Refer
to the applicable circuit breakers individual specification sheet (see 3.1) for additional test information and
requirements. Unless otherwise specified herein, no adjustments shall be made to circuit breakers or attachments
during or between qualification tests.
4.2.1 Additional attachment qualification requirements. If a vendor wants to qualify an additional attachment
not included during initial qualification testing, all circuit breaker samples (see 4.2.3) shall be included and all test
requirements of Tables V and VI shall be met. If the circuit breaker or the attachment fails any of the tests, the
attachment shall not be qualified. The testing performed on the circuit breakers during the qualification of the
additional attachment shall not replace or alter the due date for comparison inspection and qualification retention
testing (see 4.2.4). For example, Vendor A successfully performs an initial qualification on a circuit breaker with a
shunt trip in 2007. In 2008, Vendor A wants to qualify an undervoltage release for the same circuit breaker. The
circuit breaker with undervoltage release installed in applicable samples shall be subjected to all tests in Tables VI
and VII. If the circuit breaker or undervoltage release fails any test for any reason, the undervoltage release shall not
be qualified. Vendor A is still required to perform comparison inspection and qualification retention testing in 2010
and 2013, respectively, with all qualified attachments (shunt trip and undervoltage release).
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