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.