Specifications

8 Distribution Products Catalog CA08101001E—October 2010 www.eaton.com
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16.2
Tr a n s f er Switches
Contactor-Based Designs
Contactor-Based ATS with ATC-300 Controller
Contents
Description Page
Automatic Open Transition, 40–1200A
Features, Benefits and Functions . . . . . . . . . . . . . . . . . . 9
Catalog Number Selection . . . . . . . . . . . . . . . . . . . . . . . 10
Technical Data and Specifications . . . . . . . . . . . . . . . . . . 10
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Automatic Closed Transition, 40–1200A . . . . . . . . . . . . . . . 12
Bypass Isolation Transfer Switches, 40–1200A,
Dual Drawout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Bypass Isolation Transfer Switches, 40–1200A,
Fixed Bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Automatic Open Transition, 40–1200A
Product Description
The automatic open transition
contactor-based transfer
switch is the most basic
design that will provide a
fully functioning automatic
transfer switch.
The power switching
operation of Eaton’s
contactor-based transfer
switches may be separated
into the following key
categories of:
●
Open in-phase transition—
break-before-make
operation utilizing an in-
phase monitor for source
synchronization
●
Open delayed transition—
break-before-make
operation utilizing a
programmable time delay
(true neutral position)
The open in-phase transition
utilizes a two-position
mechanism and the open
delayed transition utilizes a
three-position mechanism.
The mechanism used to
operate the Eaton electrical
contactor is a momentarily
energized solenoid consisting
of a stationary core and
a moving core that is
magnetically driven by
an electrical coil.
The mechanism can be
electrically and mechanically
operated. The design is
such that the mechanism is
inherently interlocked so the
device cannot be closed on
the Source 1 and Source 2
at the same time under
any circumstances. When
switching from Source 1
to Source 2, or Source 2 to
Source 1, the mechanism
will only allow a break-before-
make operation.
These contactor-based
designs can be applied
with the ATC-100 controller
up to 400A. The ATC-300
controller can be applied
for applications 40–1200A.
Applications needing
communication capability
require the ATC-800
controller.
Application Description
An automatic open transition
transfer switch may be used
for those applications where
emergency backup power is
required, but a momentary
loss of power is acceptable
on the retransfer from
emergency to normal.