MIL-DTL-17361G(SH)
APPENDIX A
f.
The fuse unit plugs directly into the circuit breaker.
A.3.3.2 Cutler-Hammer.
A.3.3.2.1 Thermal magnetic.
A.3.3.2.1.1 AQB-A250. Note the following:
a.
Cutler-Hammer continues to manufacture the AQB-A250.
b.
It is available in dual-ratings (60 Hz AC and 250VDC) and separate 400 Hz AC ratings.
c. There are three adjustable instantaneous pickup setting dials under the front cover of the circuit breaker
(one on each pole).
d. The circuit breaker is delivered with the trip unit amp rating specified by the user. The trip unit is not
adjustable but trip units of different amp ratings are available as separate piece parts.
A.3.3.2.1.2 AQB-LF250. Note the following:
a.
Cutler-Hammer continues to manufacture the AQB-LF250.
b.
It is available in 60 Hz ratings only.
c. There are three adjustable instantaneous pickup setting dials under the front cover of the circuit breaker
(one on each pole).
d. The circuit breaker is delivered with the trip unit amp rating specified by the user. The trip unit is not
adjustable but trip units of different amp ratings are available as separate piece parts.
e.
The fuse unit plugs directly into the circuit breaker.
A.3.3.2.2 Electronic.
A.3.3.2.2.1 AQB-A253. Note the following:
a. There are two separate adjustable rating plugs for this design. One rating plug covers the CCS range of 100
amps to 160 amps and the other rating plug covers the CCS range of 200 amps to 250 amps. Care should be taken
to ensure that the correct CCS range is selected for a particular application.
b.
It is available in separate 60 Hz and 400 Hz AC ratings; there are no DC ratings.
c.
It uses rms current sensing.
d. The circuit breaker has field adjustable settings for short-time delay pickup and short-time delay time band.
Long-time delay features are fixed. There is no separate adjustable setting dial for instantaneous but the circuit
breaker does have a fixed instantaneous setting of 7500 amps. There is an "INST" setting on the short-time delay
band dial to emulate an instantaneous trip function. See MIL-DTL-17361/6 for complete details on available
settings.
A.3.3.2.2.2 AQB-L253. Note the following:
a. There are two separate adjustable rating plugs for this design. One rating plug covers the CCS range of 100
amps to 160 amps and the other rating plug covers the CCS range of 200 amps to 250 amps. Care should be taken
to ensure that the correct CCS range is selected for a particular application.
b.
It is available in 60 Hz AC ratings; there are no DC or 400 Hz AC ratings.
c. It uses rms current sensing and is current limiting; it does not have a fuse unit that plugs into the circuit
breaker.
d. The circuit breaker has field adjustable settings for short-time delay pickup and short-time delay time band.
Long-time delay features are fixed. There is no separate adjustable setting dial for instantaneous but the circuit
breaker does have a fixed instantaneous setting of 7500 amps. There is an "INST" setting on the short-time delay
band dial to emulate an instantaneous trip function. See MIL-DTL-17361/7 for complete details on available
settings
A.3.3.3 Form, fit, and function replacement considerations (circuit breakers from same vendor).
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