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31
User Manual
MN013016EN
Effective July 2022
Magnum PXR and Power Defense SB low
voltage power circuit breakers user manual
EATON
www.eaton.com
Terminal block extension bracket
—Terminal block extension
bracket is attached to either side of the cassette or elsewhere within
switchgear and provides attachment points for up to three additional
secondary terminal blocks . This accessory is meant to be used when
the number of secondary circuits exceeds the space available at the
top of the cassette or fixed mount breaker . If the bracket is attached
to the side of the cassette, it may interfere with other accessories .
Door escutcheon
—The door escutcheon is a molded frame used
to seal the space between the circuit breaker and the compartment
door cutout . It is supplied with a mounting gasket (
) .
The door escutcheon and gasket have an IP41 rating .
Figure 51. Door escutcheon and gasket
IP55 waterproof cover
—A hinged dome-shaped waterproof cover
attaches to the metal compartment door to provide waterproof
protection for the circuit breaker (
) .
Figure 52. IP55 waterproof cover (Magnum DS shown)
Mechanical interlock
—A family of mechanical interlocks are available
to interlock the closing of two or three Magnum PXR or PD-SB circuit
breakers . The mechanical interlock holds one or more circuit breakers
tripped (prevents closure) when others are closed . A lever assembly
is mounted on each breaker, which interfaces with the pole shaft and
the tripper bar . The lever assemblies are interconnected with either
cables or rods, depending upon the relative orientation of the breakers .
Rods can be used only when the circuit breakers to be interlocked
are vertically stacked . Cables can be used for any orientation of
the breakers . Mechanical interlocks are available for both fixed
and drawout circuit breakers, and in both two-way and three-way
versions . An illustration of a two-way cable interlock mounted on
two drawout circuit breakers is shown in
.
Figure 53. Cassette-mounted two-way cable interlock (Magnum
DS shown)