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IB140015EN
Instructional Booklet
Page
8
Effective: August 2014
ATC-900 Magnum Tranfer Switch O & M Manual
In addition, a fixed switching device does not have a standard fea-
ture to hold the switching device in a “trip-free” position.
Magnum fixed switching device terminals have holes for making
bolted horizontal primary bus connections. Adapters are available
for making vertical primary bus connections. Secondary connec-
tions can be made through standard terminal blocks or a special
connector compatible with the drawout switching device’s type
secondary connector. Both secondary connection devices are
mounted at the top front of the switching device.
The Magnum fixed switching devices have two mounting feet,
one on each side, to permit the switching device to be securely
mounted to the transfer switch frame. Each mounting foot has
two slotted mounting holes to facilitate mounting.
1.4 Transfer Switch Catalog Number Identification
Transfer switch equipment catalog numbers provide a significant
amount of relevant information that pertains to a particular piece
of equipment. The catalog number identification table (Table 3)
provides the required interpretation information. An example for
an open transition switch is offered to initially simplify the pro-
cess.
Example:
Catalog Number (circled numbers correspond to position
headings in Table 3).
The catalog number ATV9MGB33200XRU describes an ATS with
the switching devices mounted vertically in the enclosure. The
intelligence, represented by the ATC-900, is a microprocessor-
based logic package. The Magnum Breaker is used as the switch-
ing device and is a 3-pole power case breaker for each source.
The continuous current rating of this equipment is 3200 A and is
applicable at 480/277 Vac, 60 Hz. The transfer switch equipment
is enclosed in a NEMA 3R enclosure and is listed for Underwriters
Laboratories (UL) and Canadian Standards Association (CSA)
applications.
