LOGIC
PANEL
POWER
PANEL
VOLTAGE SELECTION
& TRANSFORMER PANEL
For more information visit: www.eaton.com
IB140036EN
Instruction Booklet
Page
4
Effective: October 2014
O&M Manual for 40-1200A (480/600 Vac) ATC-900 3-Position,
Open/Closed Transition Contactor Based Transfer Switch
Figure 4A. Open Transition Contactor Based ATS (1200A).
Each panel is independently mounted with interconnecting wiring
terminated at the connector receptacles on the ATC-900 Control-
ler.
For open transition contactor based transfer switch, enclosure
mounting is simplified by utilizing mounting flanges with elon-
gated (teardrop) mounting holes on top and floor mount (wall
supported) flanges with two standard mounting holes on the bot-
tom.
For close transition contactor based transfer switch, enclosure is
free standing and is seismic approved. Refer to Section 4 for spe-
cific mounting and modification details.
Table 1. Withstand Ratings.
LOGIC
PANEL
POWER
PANEL
VOLTAGE SELECTION
& TRANSFORMER PANEL
Figure 4B. Closed Transition Contactor Based ATS (1200A)
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
9
C3
X
3
1200
X
R U
1 to 2
3
4
5
6
7
8
9
to
12
13
14
15
to
The catalog number ATC9C3X31200XRU 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-900 controller. The continuous current rating of
this equipment is 1200A and applicable at 480 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)
480 Vac
600 Vac
Switch
Rating
(Amps)
Any
Breaker
(Amps)
Specific
Breaker
Amps)
Any
Breaker
Amps)
Specific
Breaker
Amps)
100A
50,000
65,000
50,000
65,000
200A
50,000
65,000
50,000
65,000
260A
50,000
65,000
50,000
65,000
320A
50,000
65,000
50,000
65,000
400A
50,000
65,000
50,000
65,000
600A
50,000
65,000
50,000
65,000
800A
50,000
65,000
50,000
65,000
1000A
50,000
65,000
50,000
65,000
1200A
50,000
65,000
50,000
65,000
