LOGIC
PANEL
SOURCE 1
LUGS
TRANSFER
MECHANISM
SOURCE 2
LUGS
LOAD
LUGS
GROUND
CONNECTION
VOLTAGE
PANEL
NEUTRAL
CONNECTION
SELECTION
For more information visit: www.eaton.com
IB140036EN
Instruction Booklet
Page
8
Effective: October 2014
O&M Manual for 40-1200A (480/600 Vac) ATC-900 3-Position,
Open/Closed Transition Contactor Based Transfer Switch
Figure 6A. Typical for 1200A Open Transition ATS.
LOGIC
PANEL
SOURCE-1 LUGS
VOLTAGE SELECTION
& TRANSFORMER PANEL
TRANSFER
MECHANISM
SOURCE-2 LUGS
LOAD LUGS
GROUND
CONNECTION
Figure 6B. Typical for 1200A Close Transition ATS.
3.3 Voltage Selection
3.3.1 North American Voltage Selection (120, 208, 240,
480, 600, 60 Hz)
The North American market voltage selection panel consists of
multi-tap transformers, contained in a steel case mounted in the
transfer switch enclosure (Figure 7). The cover has two connec-
tors on it, with the one on the right being selectable depending on
the voltage applied to S1 and S2. The transformer unit is easily
removed by removing the two front screws and disconnecting the
two plugs. The rear of the transformer enclosure has two flanges
that are inserted into two slots. The voltage is selected by simply
removing the plug from the default selected voltage on the cover
plate and installing the plug to the desired available voltage. Plugs
are provided for 120 to 600 Vac to satisfy any required North
American market application voltage. The factory default posi-
tion is 480 Vac or 600 Vac. There is a similar selection panel for
international voltages.
