Comments, suggestions, or questions on this document should be addressed to: Commander, Naval Sea Systems
Command, ATTN: SEA 05Q, 1333 Isaac Hull Avenue, SE, Stop 5160, Washington Navy Yard, DC 20376-5160 or
emailed to CommandStandards@navy.mil
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AMSC N/A FSC 6110
INCH-POUND
MIL-PRF-17773C(SH)
21 November 2006
SUPERSEDING
DOD-S-17773B(SH)
14 September 1983
PERFORMANCE SPECIFICATION
SWITCHES, BUS TRANSFER, ELECTRIC POWER,
AUTOMATIC AND MANUAL
This specification is approved for use by the Naval Sea Systems Command, Department of the Navy, and is
available for use by all Departments and Agencies of the Department of Defense.
1. SCOPE
1.1 Scope
. This specification covers the Automatic Bus Transfer Switch (ABT) (see 6.4.1) and the Manual Bus
Transfer Switch (MBT) (see
6.4.13), herein referred to as ABT, MBT, or switch(es), for use on surface and
submarine Naval vessels. Unless otherwise specified herein, this specification applies to both ABTs and MBTs.
Requirements for Static or Solid State ABTs (SABTs) are not defined in this specification. MIL-PRF-32150
specifies requirements for SABTs.
1.2 Classification
. Switches have the following characteristics: (Part or identifying number (PIN) codes are
provided along with the classifications to avoid unnecessary duplication of information in
1.3.)
1.2.1 Voltage
. Switch voltages are as follows:
Voltage PIN Code
120 V 1
208 V (400 Hz only) 2
240 V (DC only) 3
450 V (AC only) 4
Other 6
1.2.2 Frequency. Switch frequencies are as follows:
Frequency PIN Code
60 Hz A
DC D
400 Hz F
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