MIL-DTL-17361G(SH)
APPENDIX A
A.3.3.3.1 SPD.
a. Both SPD AQB-A252 designs are form and fit replacements for the SPD AQB-A250. Attachments (if
applicable) and adjustable settings must be taken into consideration to make them functional equivalents. See
A.3.3.5 for attachment information. See A.3.8 and Table A-XII for guidance on how to set the SPD AQB-A252
designs to make them functional replacements for the SPD AQB-A250 (60 Hz and 400 Hz AC ratings only) with
respect to CCS and overcurrent protection.
b. Both SPD AQB-LF252 designs are form and fit replacements for the SPD AQB-LF250. Attachments (if
applicable) and adjustable settings must be taken into consideration to make them functional equivalents. See
A.3.3.5 for attachment information. See A.3.8 and Table A-X for guidance on how to set the SPD AQB-LF252
designs to make them functional replacements for the SPD AQB-LF250 with respect to CCS and overcurrent
protection.
A.3.3.3.2 Cutler-Hammer.
a. The Cutler-Hammer AQB-A253 design is a form and fit replacement for the Cutler-Hammer AQB-A250.
Attachments (if applicable) and adjustable settings must be taken into consideration to make them functional
equivalents. See A.3.3.5 for attachment information. See A.3.8 and Table A-XIII for guidance on how to set the
AQB-A253 to make it a functional replacement for the Cutler-Hammer AQB-A250 (60 Hz and 400 Hz AC ratings
only) with respect to CCS and overcurrent protection.
b. The Cutler-Hammer AQB-L253 will fit into the Cutler-Hammer AQB-LF250 mounting base/block.
However, when the switchboard cover is reinstalled after a swap-out, there will be a gap between the bottom of the
Cutler-Hammer AQB-L253 and the switchboard cover where the AQB-LF250 fuse unit used to be. Cutler-Hammer
manufactures a close-out plate that covers this gap when installed. Attachments (if applicable) and adjustable
settings must be taken into consideration to make them functional equivalents. See A.3.3.5 for attachment
information. See A.3.8 and Table A-XI for guidance on how to set the Cutler-Hammer AQB-L253 to make it a
functional replacement for the Cutler-Hammer AQB-LF250 with respect to CCS and overcurrent protection.
A.3.3.4 Form, fit, and function replacement considerations (circuit breakers from different vendors). Note the
following:
a. The SPD AQB-A252 designs are form and fit replacements for the Cutler-Hammer AQB-A250.
Attachments (if applicable) and adjustable settings must be taken into consideration to make them functional
equivalents. See A.3.3.5 for attachment information. See A.3.8 and Table A-XII for guidance on how to set the
SPD AQB-A252 designs to make them functional replacements for the Cutler-Hammer AQB-A250 (60 Hz and 400
Hz AC ratings only) with respect to CCS and overcurrent protection.
b. The Cutler-Hammer AQB-A253 is a form and fit replacement for the SPD AQB-A250. Attachments (if
applicable) and adjustable settings must be taken into consideration to make them functional equivalents. See
A.3.3.5 for attachment information. See A.3.8 and Table A-XIII for guidance on how to set the Cutler-Hammer
AQB-A253 to make it a functional replacement for the SPD AQB-A250 (60 Hz and 400 Hz AC ratings only) with
respect to CCS and overcurrent protection.
c. The SPD AQB-LF252 designs are form and fit replacements for the Cutler-Hammer AQB-LF250.
Attachments (if applicable) and adjustable settings must be taken into consideration to make them functional
equivalents. See A.3.3.5 for attachment information. See A.3.8 and Table A-X for guidance on how to set the SPD
AQB-LF252 designs to make them functional replacements for the Cutler-Hammer AQB-LF250 with respect to
CCS and overcurrent protection.
d. The AQB-L253 will fit into the SPD AQB-LF250 mounting base/block. However, when the switchboard
cover is reinstalled after a swap-out, there will be a gap between the bottom of the AQB-L253 and the switchboard
cover where the AQB-LF250 fuse unit used to be. Cutler-Hammer manufactures a close-out plate that covers this
gap when installed. Attachments (if applicable) and adjustable settings must be taken into consideration to make
them functional equivalents. See A.3.3.5 for attachment information. See A.3.8 and Table A-XI for guidance on
how to set the Cutler-Hammer AQB-L253 to make it a functional replacement for the SPD AQB-LF250 with
respect to CCS and overcurrent protection.
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