MIL-DTL-17361G(SH)
APPENDIX A
b. For AQB-A802 circuit breakers with shunt trips, there are no external leads for a 1a, 1b auxiliary switch
where the "a" contact is used as a cut-off switch as there are for the thermal magnetic circuit breakers. The cut-off
switch for the electronic circuit breakers is wired internally. As a comparison to the examples above, suppose an
AQB-A802 with a 1a, 1b aux switch and shunt trip is needed. The user will see the following leads exiting the
circuit breaker:
3 leads for the 1a, 1b switch for customer use
2 leads for the shunt trip
Note that for the same functionality, there are only 5 leads exiting the electronic circuit breaker whereas the thermal
magnetic circuit breaker has 8 leads exiting. As another example, suppose an AQB-A802 with just a shunt trip is
needed. The user will see the following leads exiting the circuit breaker:
2 leads for the shunt trip
Note that for the same functionality, there are only 2 leads exiting the electronic circuit breaker whereas the thermal
magnetic circuit breaker has 5 leads exiting.
A.3.5.4.2 Motor operators. Note the following:
a. The motor operators for SPD 800 amp circuit breakers use a cannon plug connector as the interface
connection between the motor operator and the switchboard wiring. Individual leads are not provided with the
motor operator.
b.
In 1996, SPD changed the part of the cannon plug that receives wiring from the switchboard.
c. SPD manufactures motor operators for use with standard circuit breaker designs and separate motor
operators for use with "enhanced" circuit breakers (circuit breakers with communications capability).
A.3.4.5.2.1 Form, fit, and function replacement considerations. Note the following:
a. SPD motor operators are interchangeable between SPD thermal magnetic and standard electronic circuit
breakers. For example, the 115VAC, 60Hz/120VDC motor operator used with an SPD AQB-A400 is the same
115VAC, 60Hz/120VDC motor operator used with a standard SPD AQB-A402.
b. The SPD motor operators for standard circuit breakers are not interchangeable with SPD motor operators
for enhanced circuit breakers.
c. The 1996 change to the SPD cannon plug connector can cause form and fit problems in the field. For
example, suppose a ship has an SPD AQB-A800 with 115VAC/60Hz/120VDC motor operator installed and the
motor operator fails. The replacement motor operator is one made after 1996. There will be an interface problem
between the existing switchboard wiring and the motor operator cannon plug. NAVSEA is working with SPD to
resolve this issue but in the meantime, users should be aware that rewiring or modification of the switchboard wiring
may be necessary to interface properly with the motor operator cannon plug for this scenario.
A.3.6 1600-amp frame (SPD thermal magnetic and electronic types). Details of SPD circuit breakers are
discussed in this section. Cutler-Hammer manufactures an AQB-A1601 thermal magnetic and AQB-A1602
electronic circuit breaker. Since the AQB-A1601 and AQB-A1602 are not replacement options for any obsolete
SPD circuit breaker, they are not discussed further in this section. For more details on these circuit breakers, refer to
the applicable specification sheets of MIL-DTL-17361 or contact Cutler-Hammer.
A.3.6.1 AQB-A1600 (thermal magnetic). Note the following:
a. The AQB-A1600 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.
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.3.6.2 AQB-A1604 (electronic). Note the following:
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