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Overview of the Magnum PXR low voltage circuit breaker
MAGNUM PXR PRODUCT GUIDE
PA013006EN September 2022 www.eaton.com
1
Breaker mounting configurations
Magnum circuit breakers are available in both fixed and
drawout configurations; however, in a small number
of instances, only some breakers are available in fixed
configuration.
Fixed mounting
Magnum circuit breakers can be fixed mounted.
The breaker bolts directly to the enclosure main bus,
which allows for efficient current transfer under loaded
conditions. Metal mounting feet are provided as a
standard feature for use in securely bolting the breaker to
the enclosure. Fixed circuit breaker construction is simple
and economic because there are no drawout system
components. A fixed circuit breaker is supplied with
horizontal, pre-drilled primary terminal pads for terminating
the breaker to the bus.
ote:
N
Optional vertical primary adapters are available to
accommodate different bus configurations. See
Section 8 for diagrams with detailed dimensions.
Drawout mounting
A drawout circuit breaker is used in combination with a
cassette. The cassette provides for all the required drawout
features for both primary and secondary connections.
Mounting locations for cassette mounted cell switches,
primary safety shutters and various key interlocks are part
of the cassette design, to allow for customized customer
options. Refer to
Section 8
for specific drawout circuit
breaker dimensions.
Cassettes – available styles
Narrow frame cassettes (for narrow frame and double narrow
frame breakers)
For narrow frame circuit breakers, there is one type of
cassette design, which uses horizontal stabs. Optional
bolt-on 90-degree adapters can be used to rotate the
cassette’s primary terminals to a vertical orientation as
required. The 4000A double narrow cassette is available
in this same design as well as a vertical interleaf design
which utilizes an interleaved style connection on the back
of the cassette. The 5000A double narrow utilizes this
same vertical interleaf cassette with additional bus (see
Special 5000A double narrow and 6000A double wide
runback section).
Standard frame cassettes (for standard frame and double
standard frame breakers)
For standard and double frame circuit breakers, there are
three cassette styles, all with vertical stabs available:
•
Basic cassette with copper stabs:
This cassette
comes with factory installed copper stabs/terminals on
the cassette.
Figure 15. Fixed mounting breaker
Figure 16. Drawout mounting breaker
Figure 17. Narrow frame cassettes
Figure 18. Standard frame cassette with copper stabs