IB140036EN
For more information visit: www.eaton.com
Instruction Booklet
Effective: October 2014
Page
7
O&M Manual for 40-1200A (480/600 Vac) ATC-900 3-Position,
Open/Closed Transition Contactor Based Transfer Switch
Section 3: Equipment Description
3.1 General
The ATS consists of three basic panels:
1. The power panel;
2. The voltage selection and transformer panel; and
3. The microprocessor-based logic panel.
These panels are interconnected via connector plugs and
mounted in an enclosure (Figure 5A & 5B)
.
LOGIC
PANEL
POWER
PANEL
VOLTAGE SELECTION
& TRANSFORMER PANEL
Figure 5A. Three Basic Panels of an Open Transition ATS
(1200A).
LOGIC
PANEL
POWER
PANEL
VOLTAGE SELECTION
& TRANSFORMER PANEL
Figure 5B. Three Basic Panels of a Close Transition ATS
(1200A).
3.2 Power Panel
The power panel is used for making load, power, and neutral con-
nections. The power contactor is mounted on a steel baseplate
(Figure 6).
3.2.1 Main Contacts
This ATS incorporates a power contactor. The main contacts
connect and disconnect the load to and from the different power
sources. The power contactor is mechanically and electrically
interlocked to prevent the two sets of main contacts from being
closed simultaneously (applicable for open transition ATS only).
