MIL-DTL-17361G(SH)
APPENDIX A
a.
The AQB-A1604 is available in 60 Hz AC ratings.
b. Rating plugs are used to establish CCS. It has 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-
17361/13 for complete details on available settings.
c.
It is available in an "enhanced" version that includes communications capability.
A.3.6.3 Form, fit, and function replacement considerations. The SPD AQB-A1604 is a form and fit
replacement for the SPD AQB-A1600. Attachments (if applicable) and adjustable settings must be taken into
consideration to make them functional equivalents. See A.3.6.4 for attachment information. See A.3.8 and Table
A-XVIII for guidance on how to set the SPD AQB-A1604 to make it a functional replacement for the SPD AQB-
A1600.
A.3.6.4 Attachments. Attachments include motor operators, undervoltage releases, shunt trips, and auxiliary
switches. Important aspects of attachments are ratings and number and type of leads or connectors exiting the
circuit breaker. These aspects can differ depending on which type of circuit breaker is involved. See A.3.6.4.1,
A.3.6.4.2, A.3.7, and Table A-V for more information on attachments.
A.3.6.4.1 Undervoltage release, shunt trip, and auxiliary switch cannon plug connectors and leads. Note the
following:
a.
For the obsolete AQB-A1600, these attachments were always delivered with cannon plug connectors, not
leads.
b.
The same attachments for the AQB-A1604 can be ordered with cannon plug connectors or leads.
c. When using the AQB-A1604 to replace an obsolete AQB-A1600 with one or more of these attachments,
cannon plug connectors must be specified for the same AQB-A1604 attachments.
A.3.6.4.2 Motor operators. Note the following:
a. The motor operators for SPD 1600 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.3.6.4.2.1 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-A1600 is the same
115VAC, 60Hz/120VDC motor operator used with a standard SPD AQB-A1604.
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-A1600 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.3.7 Attachment tables. Note the following:
a. Consult both the tables and the appendix paragraphs called out in the tables to get a more thorough
understanding of attachments.
b. In some cases, differences in attachments may be the sole reason that a particular circuit breaker cannot be
used as a replacement for an obsolete circuit breaker.
c.
The same information applies to NQB versions of the circuit breakers listed.
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