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I.B. ATS-AG03
SECTION 3: EQUIPMENT DESCRIPTION
3.1 GENERAL
The AGswitch consists of two basic items interconnect-
ed via connector plugs and mounted in an enclosure
(Figure 1-2).
3.2 POWER PANEL
The power panel is used for making load, power, and
neutral connections. The main contacts and the transfer
mechanism are all on one steel frame (Figure 3-1 and
3-2).
3.2.1 STEEL BASE PLATE
The steel base plate design permits the power panel to
be moved vertically within the enclosure to accommo-
date top or bottom cable entry (Figure 4-1). Elongated
holes on either side of the base plate ensure proper
positioning. The bottom set of elongated holes positions
the power panel higher in the enclosure, thus permitting
bottom cable entry. The top set of elongated holes posi-
tions the power panel lower in the enclosure for top
cable entry. Section 4 discusses equipment mounting
and load lug location in detail.
3.2.2 MAIN CONTACTS
The main contacts connect and disconnect the load to
and from the different power sources. High withstand
molded case switches are the main contacts for the nor-
mal and emergency power sources in standard
AGswitch automatic transfer switches (Figures 3-3 and
Section 3.6). These continuous duty transfer switches
are rated for all classes of loads, open or enclosed.
In addition, they have high dielectric strength, heavy-
duty switching and withstand capabilities, and high inter-
ruption capacity. This transfer switch incorporates
Cutler-Hammer-type molded case switches.
The switching devices are mechanically and electrically
interlocked to prevent the two sets of main contacts
from being closed simultaneously. The load side con-
tacts of each switching device are joined with a bus bar
assembly to form a common load terminal location,
either top or bottom (Figures 4-2 and 4-3).
3.2.3 TRANSFER MECHANISM (300-600A)
The transfer mechanism transfers between power
sources through a motor-driven, ratchet-type operation.
A rotational motion is created on an indicator wheel by
the ratchet's operation. The indicator wheel is attached
Effective 7/00
to rigid shafts which convert the rotary motion into verti-
cal linear motion. Opening and closing the switching
devices is accomplished as a result of this vertical linear
motion. The transfer mechanism is mounted in front of
the molded case switches (Figure 3-1).
A solid steel shield attached to the ratchet assembly
permits viewing of the rotary switch position indicator
while restricting access to other parts of the power panel
(Figure 1-2).
3.2.4 TRANSFER MECHANISM (30-200A)
This mechanism transfers between power sources using
a motor-driven arm that connects to a lever which oper-
ates both the normal and emergency switches (Figure
3-2).
Figure 3-1 Typical Power Panel (Unmounted) for 300-
600A Models
Page 5
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