MIL-PRF-17773C(SH)
Configuration Type (CT) Description
PIN Code
ABT is similar to configuration type 07 with additional current sensing on load
08
terminals to inhibit transfer during overload conditions.
ABT is the same as configuration type 03 but is:
(a) three-way and
(b) normal seeking between normal and alternate and
(c) power seeking to emergency and
(d) automatically signals the start of the emergency power source and
09
(e) open mounting type and
(f) facilities for dead front mounting and
(g) automatic starting of emergency/auxiliary generator and
(h) DC has no line circuit time delay.
ABT has:
(a) control circuit time delay 2.5 to 3.5 seconds and
(b) single phase protection on normal bus and
10
(c) in-phase monitoring and
(d) is normal seeking.
ABT is the same as configuration type 03, but is power seeking.
11
Manual Bus Transfer Switch
12
Note:
1. In-phase monitoring is not used in 400-Hz ABTs on Naval vessels.
1.2.4 Special features. Switch special features are as follows:
Special Feature
PIN Code
Special Feature(s)
S
No Special Feature(s)
X
1.2.5 Current rating. Switch current ratings are as follows:
Current Rating
PIN Code
025 to 600 amps
XXX
1.2.6 Cabinet integrity. Switch cabinet integrities are as follows:
Cabinet Integrity
PIN Code
Drip-proof
D
Splash-proof
S
Watertight
W
Open Mounted
O
3
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