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Multiple source/multiple ground
Multiple source/multiple ground sensing schemes are
also possible on systems with multiple sensors. For more
information, see I.B. 32-693 A.
Phasing on double-wide application
Magnum circuit breakers manufactured in the double-wide
frame have two available phasing configurations which
must be confirmed when the breaker is ordered.
The phasing convention is determined facing the front
of the breaker from left to right. For 4-pole applications,
the neutral is located on the left and is rated 100% of the
breaker continuous current rating.
The following phasing configurations are available:
3-Pole AABBCC
•
4-Pole NNAABBCC
•
3-Pole ABCABC
•
4-Pole NNABCABC
•
4-Pole NABCNABC
•
The type of phasing selected depends on how the circuit
breaker will be applied in the enclosure and the type of
Eaton power distribution enclosure that it will be applied
in.
AABBCC or NNAABBCC phasing
AABBCC phasing is the convention commonly used in
Eaton UL891 switchboards using Magnum breakers. The
AABBCC convention is recommended for most OEMs
manufacturing their own power distribution enclosures.
It is ideal for applications where the breaker is mounted
single high (one breaker in a structure).
ABCABC or NABCNABC phasing
ABCABC phasing is the convention commonly used in
Eaton Magnum UL1558 switchgear. Double-wide breakers
with this type of phasing are designed to accommodate 2
sets of vertical risers in the same structure. This provides
for significant space savings because two or more stan-
dard frame feeder breakers can be mounted above or
below the double-wide breaker in the same structure.
The ABCABC convention is more difficult for OEMs who
manufacture their own power distribution enclosures
to apply. Switchgear bus design and testing as well as
placement and balance of the feeder breaker loads are
very important to assure that phase currents divide evenly
through the double-wide breaker. ABCABC phasing is
available, but not common in IEC switchgear applications.
Contact Eaton for more information.
Power system coordination
The tables for selective coordination to the Magnum PXR
can be found in the IA01200002E document located on
Eaton.com/magnumpxr.
MAGNUM PXR PRODUCT GUIDE PA013006EN September 2022 www.eaton.com
Magnum PXR applications
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