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IB01602046E
Instruction Booklet
Page
4
Effective: July 2010
2-Position Contactor Based
Non-Automatic Transfer Switch
Figure 4. Contactor Based Non-Automatic Transfer Switch
(100A).
Each panel is independently mounted with interconnecting wiring
terminated connector plugs to permit individual panel removal
without disturbing critical connections.
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 Non-Automatic Transfer Switch 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).
The catalog number NTCEC2X20400WRU describes a non-auto-
matic transfer switch with a 2 pole, 2 position Power Contactor
mounted on a baseplate within the enclosure. The intelligence
represented by the logic panel is Electromechanical. The continu-
ous 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
10,000
30,000
10,000
22,000
200
10,000
30,000
22,000
35,000
260
30,000
50,000
320
30,000
50,000
400
30,000
50,000
NT
C
E
C2
X
2
0400
W R U
1 to 2
3
4
5
6
7
8
9
to
12
1
3
14
15
to
