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IB140024EN
Instruction Booklet
Page
4
Effective: October 2014
ATC-300/900 40-400A (480/600Vac)
3-Postion Contactor Based Transfer Switch
Figure 4. Contactor Based ATS (400A).
Each panel is independently mounted with interconnecting wiring
terminated at the connector receptacles on the ATC-300+ Con-
troller. Door or individual panel removal is achieved without dis-
turbing critical connections by removing the connectors from the
receptacles and cutting the wire ties that secure the wires to the
door.
Mounting the enclosure is simple using top and bottom mounting
flanges with elongated (teardrop) mounting holes. These mount-
ing holes, along with power panel positioning bolts and pre-
tapped inserts, insure proper power panel mounting after the ini-
tial enclosure installation. Refer to Section 4 for specific mount-
ing and modification details.
Table 1. Withstand Ratings.
1.3 ATS Catalog Number Identification
Transfer switch equipment catalog numbers provide a significant
amount of relevant information that pertains to a particular piece
of equipment. The Catalog Number Identification Table (Table 2)
provides the required interpretation information. An example is
offered here to initially simplify the process.
Example:
Catalog Number (circled numbers correspond to position
headings in Table 2).
AT C 3
C3
X 3 0400 W R U
1 to 2 3
4
5
6
7
8
9
to
12
13
14
15
to
The catalog number ATC3C3X30400WRU describes an ATS with
a 3-pole, 3 position Power Contactor mounted on a baseplate
within the enclosure. The intelligence represented by the logic
panel is ATC-300+ controller. The continuous current rating of
this equipment is 400A and applicable at 240 Vac, 60 Hz. The
transfer switch equipment is enclosed in a NEMA 3R enclosure
and is listed for UL applications.
UL 1008 WITHSTAND AND CLOSE-ON RATINGS (kA)
UL 1008 Ampere Rating
480 Volts
600 Volts
Any
Breaker
Specific
Breaker
Any
Breaker
Specific
Breaker
100
30,000
30,000
22,000
35,000
200
30,000
30,000
22,000
35,000
260
30,000
50,000
–
–
320
30,000
50,000
–
–
400
30,000
50,000
–
–
