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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)
APPENDIX A
A.2.1.2 Electronic. The following circuit breakers are currently available:
AQB-A102 (Types E1 and E2 with continuous current setting (CCS) dial)
AQB-A252 (with rating plug or CCS dial)
AQB-LF252 (with rating plug or CCS dial)
AQB-A402 (with rating plug or CCS dial)
AQB-LF402 (with rating plug or CCS dial)
AQB-A802 (with rating plug)
AQB-A1604 (with rating plug)
NQB versions of the A102, A252, A402, A802, and A1604
The AQB-A102 Type E is obsolete.
A.2.1.3 Miscellaneous information. SPD designates electronic circuit breakers noted above as the "Actron"
line. Circuit breaker label plates include this designation.
A.2.2 Cutler-Hammer (formerly Westinghouse) AQB/NQB circuit breakers.
A.2.2.1 Thermal magnetic. The following circuit breakers are currently available:
AQB-A50 and NQB-A50
AQB-A51 and NQB-A51
AQB-A100 and NQB-A100
AQB-LF100
AQB-A101 and NQB-A101
AQB-A250 and NQB-A250
AQB-LF250
AQB-A1600 and NQB-A1600
AQB-A1601 and NQB-A1601
A.2.2.2 Electronic. The following circuit breakers are currently available:
AQB-A103 (with CCS dial)
AQB-A103RMS (with CCS dial)
AQB-A253 (with adjustable rating plug)
AQB-L253 (with adjustable rating plug)
AQB-L400 (with rating plug)
AQB-LL400 (with rating plug)
AQB-A1602 (with rating plug)
NQB-A803 and NQB versions of the A103, A253, LL400, and A1602
A.2.2.3 Miscellaneous information. Note the following:
a.  In 1994, Cutler-Hammer took over production of circuit breakers formerly manufactured by Westinghouse.
Cutler-Hammer and Westinghouse circuit breakers are interchangeable and use the same part number system. For
example, a Westinghouse AQB-A250 circuit breaker with a 125N trip element has part number 313C682G03. A
Cutler-Hammer AQB-A250 circuit breaker with a 125N trip element has the same part number.
b.  Cutler-Hammer/Westinghouse calls their part number a style number and abbreviated the term with an "S."
In Navy logistics documentation, provisioners sometimes carried over the S and included it with the part number.
For example, APL 140901259 applies to a Cutler-Hammer/Westinghouse AQB-LF250 circuit breaker. The circuit
breaker part number is shown as S313C748G18 on the APL. The actual circuit breaker label plate will not show the
S.
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