MIL-DTL-17361G(SH)
APPENDIX A
b.
It was available in dual-ratings (60 Hz AC and 250 VDC) and separate 400 Hz AC ratings.
c. There were three adjustable instantaneous pickup setting dials under the front cover of the circuit breaker
(one on each pole).
d. The circuit breaker was delivered with the trip unit amp rating specified by the user. The trip unit was not
adjustable but trip units of different amp ratings were available as separate piece parts.
A.3.3.1.1.2 AQB-LF250. Note the following:
a. The AQB-LF250 is obsolete. Although there is no new production, the stock system or other sources may
still have assets.
b.
It was available in 60 Hz AC ratings only.
c. There were three adjustable instantaneous pickup setting dials under the front cover of the circuit breaker
(one on each pole).
d. The circuit breaker was delivered with the trip unit amp rating specified by the user. The trip unit was not
adjustable but trip units of different amp ratings were available as separate piece parts.
e.
The fuse unit plugged directly into the circuit breaker.
A.3.3.1.1.3 AQB-LF226. Note the following:
a. The AQB-LF226 is obsolete. Although there is no new production, the stock system or other sources may
still have assets.
b.
It was a modified AQB-LF250 rated at 225 amps.
c.
There are currently no form, fit, function replacements for the AQB-LF226.
d.
For more information, consult the applicable specification sheet of MIL-DTL-17361 or contact the vendor.
A.3.3.1.2 Electronic.
A.3.3.1.2.1 AQB-A252. Note the following:
a. The AQB-A252 is currently available in two different designs. One design has rating plugs to establish the
CCS while the other design has an adjustable dial on the front of the circuit breaker to establish CCS.
b. The rating plug design is available in separate 60 Hz and 400 Hz AC ratings; the CCS dial design has a
switch on the front of the circuit breaker to select 60 Hz or 400 Hz frequency. There are no DC ratings for either
design.
c. Both designs have field adjustable settings for instantaneous pickup, short-time delay pickup, and short-
time delay time band. Long-time delay features are fixed on both designs. See MIL-DTL-17361/6 for complete
details on available settings.
d.
Both designs are available in an "enhanced" version that includes communications capability.
e. The label plates for both designs state "AQB-A252" but they do have different SPD part numbers. To tell
them apart, refer to (a) and (b) above and consult SPD catalogs for part number information.
A.3.3.1.2.2 AQB-LF252. Note the following:
a. The AQB-LF252 is currently available in two different designs. One design has rating plugs to establish
the CCS while the other design has an adjustable dial on the front of the circuit breaker to establish the CCS.
b.
Both designs are available in 60 Hz AC ratings only.
c. Both designs have field adjustable settings for instantaneous pickup, short-time delay pickup, and short-
time delay time band. For the rating plug design, the fuse unit must be removed to access the adjustable settings.
Long-time delay features are fixed on both designs. See MIL-DTL-17361/7 for complete details on available
settings.
d.
Both designs are available in an "enhanced" version that includes communications capability.
e. The label plates for both designs say "AQB-LF252" but they do have different SPD part numbers. To tell
them apart, refer to (a) and (c) above and consult SPD catalogs for part number information.
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