32
User Manual MN013016EN
Effective July 2022
Magnum PXR and Power Defense SB low
voltage power circuit breakers user manual
EATON www.eaton.com
Section 4: Master connection diagrams
Secondary contacts and connection diagrams
A maximum of 84 secondary wiring connection points are available
on the Magnum PXR and PD-SB circuit breaker, each dedicated to a
specific function (Figure 55).
Figure 54. Secondary connector protective hood
A proprietary secondary contact connector with 84 plug-in contact
points is mounted on the top rear portion of the circuit breaker. The
plug-in connector is protected by a molded hood (Figure 54). When
the front cover of the circuit breaker is removed, the top of each
plug-in connector is exposed. A label on the connector identifies the
wiring points.
Labels Legend
OTS Overcurrent trip switch
G Source ground input
RY Trip unit programmable relay
+24V/0V External trip unit power
N External neutral current input
MM Maintenance Mode (ARMS)
Z Zone selective interlocking
MB MODBUS communications
CM CAMCOM communications
AQD (Future use)
RY (Future use)
VN External neutral voltage input
ST Shunt trip
SR Spring release
M/SC Charging motor
A/B/C Auxiliary switches
Figure 55. Top view secondary connectors
Drawout type circuit breakers: A mating secondary plug-in
connector is mounted on the top front portion of the drawout
cassette (Figure 56). This connector matches and plugs into the
circuit breaker mounted connector. Contact points are wired from
the cassette’s plug-in connectors to cassette-mounted terminal
blocks. The terminal blocks are also mounted on the top front
portion of the cassette. The secondary terminals have finger-proof
hinged covers with small holes for probe testing.
Protective hood
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