MIL-DTL-17361G(SH)
APPENDIX A
As another example, suppose an SPD or Cutler-Hammer AQB-A400 with just a shunt trip is needed. The user will
see the following leads exiting the circuit breaker:
3 leads for the additional 1a, 1b aux switch ("a" contact used for shunt trip cut-off switch and "b" contact tied
off and not used)
2 leads for the shunt trip
b. For SPD and Cutler-Hammer electronic 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 SPD AQB-LF400 or Cutler-Hammer AQB-LL400 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 breakers whereas the thermal
magnetic circuit breakers have 8 leads exiting. As another example, suppose an SPD AQB-LF400 or Cutler-
Hammer AQB-LL400 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 breakers whereas the thermal
magnetic circuit breakers have 5 leads exiting.
A.3.4.5.2 Motor operators.
A.3.4.5.2.1 SPD. Note the following:
a. The motor operators for SPD 400 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.3.4.5.2.2 Cutler-Hammer. Note the following:
a.
Cutler-Hammer provides leads with its 400 amp circuit breaker motor operators.
b. One type of motor operator is rated for 450VAC/115VAC with an externally mounted step-down
transformer.
A.3.4.5.2.3 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-A400 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.
d.
The SPD motor operators are not interchangeable with Cutler-Hammer motor operators.
A.3.4.5.3 Undervoltage releases. Note following:
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