MIL-DTL-17361G(SH)
APPENDIX A
e. The label plates for both designs state "AQB-A402" 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.3.4.1.2.2 AQB-LF402. Note the following:
a. The AQB-LF402 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.
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-17361/11 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-LF402" 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.
f.
The fuse unit plugs directly into the circuit breaker.
A.3.4.2 Cutler-Hammer.
A.3.4.2.1 Thermal magnetic. Cutler-Hammer does not manufacture a 400 amp frame size.
A.3.4.2.2 Electronic (AQB-LL400 and AQB-L400). Note the following:
a. The AQB-LL400 is designated with a "QS" suffix. The AQB-L400 has two separate designs, one
designated with a "QF" suffix and the other designated with a "QM" suffix.
b. The AQB-LL400 and AQB-L400 designs are identical with respect to form and fit. However, there are
significant functional differences with respect to interruption ratings, short-time delay pickup ranges, and fixed
instantaneous pickup settings. See A.3.4.3.2 for details.
c.
All designs have rating plugs to establish CCS.
d.
All designs are available in 60 Hz AC ratings; there are no DC or 400 Hz AC ratings.
e. All designs have field adjustable settings for short-time delay pickup and short-time delay time band. The
long-time delay and instantaneous features are fixed. There is a "MIN" setting on the short-time delay band dial to
approximate an instantaneous trip function. See MIL-DTL-17361/9 and MIL-DTL-17361/10 for complete details
on available settings.
f.
All designs are current limiting; they do not have a fuse unit that plugs into the circuit breaker.
A.3.4.3 Form, fit, and function replacement considerations (circuit breakers from same vendor).
A.3.4.3.1 SPD. Note the following:
a. Both SPD AQB-A402 designs are form and fit replacements for the SPD AQB-A400. Attachments (if
applicable) and adjustable settings must be taken into consideration to make them functional equivalents. See
A.3.4.5 for attachment information. See A.3.8 and Tables A-XVI for guidance on how to set the SPD AQB-A402
designs to make them functional replacements for the SPD AQB-A400 (60 Hz and 400 Hz AC ratings only) with
respect to CCS and overcurrent protection.
b. Both SPD AQB-LF402 designs are form and fit replacements for the SPD AQB-LF400. Attachments (if
applicable) and adjustable settings must be taken into consideration to make them functional equivalents. See
A.3.4.5 for attachment information. See A.3.8 and Table A-XIV for guidance on how to set the SPD AQB-LF402
designs to make them functional replacements for the SPD AQB-LF400 with respect to CCS and overcurrent
protection.
A.3.4.3.2 Cutler-Hammer. Note the following:
a.
The AQB-LL400 and AQB-L400 designs (QF and QM) are identical with respect to form and fit.
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