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2-Position Contactor Based
Non-Automatic Transfer Switch
Section 3: Equipment Description
3.1 General
The non-automatic transfer switch consists of three basic panels:
1. The power panel;
2. The voltage selection and transformer panel (if required); and
3. The electromechanical logic panel.
These panels are interconnected via connector plugs and
mounted in an enclosure (Figure 5).
POWER PANEL
VOLTAGE
SELECTION
AND
TRANSFORMER
Figure 5. Three Basic Panels of the Non-Automatic Transfer
Switch (40-400A).
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 non-automatic transfer switch incorporates a power contac-
tor. 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.
IB01602046E
LOGIC PANEL
PANEL
For more information visit: www.eaton.com
Effective: July 2010
Figure 6. Typical Power Panel for 40-400A Models.
3.3 Voltage Selection
3.3.1 Standard Voltage Selection (208, 240, 480, 600 V,
60 Hz and 220, 380, 415 V, 50 Hz.)
The standard voltage selection panel consists of multi-tap trans-
formers, contained in a steel case mounted in the enclosure (Fig-
ure 7). 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 208 to 600 Vac to satisfy required application voltage. The
factory default position is 600 Vac.
WHEN CHANGING THE SELECTED VOLTAGE, THE POWER MUST
BE REMOVED FROM THE NON-AUTOMATIC TRANSFER SWITCH
AND THE WIRES MUST BE MOVED ON THE TAPS OF BOTH TRANS-
FORMERS.
Instruction Booklet
CAUTION
Page 7
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