IB140042EN
For more information visit: www.eaton.com
Instructional Booklet
Effective: May 2015
Page
11
ATC-300/900 Breaker Based Transfer Switch
A solid steel shield (Deadfront Cover) attached to the ratchet
assembly permits viewing of the rotary switch position indicator
while restricting access to other parts of the power panel (Figure
12).
Figure 12. Vertical Design ATS Equipment with Deadfront Cover
in Place Over the Power Panel (225-1200 A)
3.2.4 Transfer Mechanism (30-150 A)
This mechanism transfers between power sources using a motor-
driven arm that connects to a lever that operates both the Source
1 and Source 2 switches (Figure 8).
3.3 Voltage Selection
3.3.1 North American Voltage Selection (120, 208, 240,
480, and 600 V, - 60 Hz)
The North American market voltage selection panel consists of
multi-tap transformers, contained in a steel case mounted in the
enclosure (Figure 13). The cover has “teardrop” holes for the
screws to allow easy access to the transformers. The voltage is
selected by simply removing the wires from the default primary
taps of both transformers and installing them on the primary taps
for the desired voltage. Taps are provided for 120 to 600 Vac to
satisfy any required North American market application voltage.
The factory default position is 600 Vac.
WHEN CHANGING THE SELECTED VOLTAGE, THE POWER MUST BE
REMOVED FROM THE ATS AND THE WIRES MUST BE MOVED ON THE
TAPS OF BOTH TRANSFORMERS.
Figure 13. North American Market Voltage Selection Terminals
(Shown Connected to the 120 Vac Taps).
CAUTION
