54
Instructions for Installation, Operation and
Maintenance of Magnum SB Insulated Case
Low Voltage Power Circuit Breakers
EATON CORPORATION www.eaton.com
Instructional Leaet IB2C12063H03
Effective March 2012
Figure 78. IP54 Waterproof Cover
IP54 Waterproof Cover
A hinged dome shaped waterproof cover attaches to the metal
compartment door to provide waterproof protection for the
circuit breaker (Figure 78).
Mechanical Interlock
A family of mechanical interlocks are available to interlock
the closing of two or three Magnum 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 2-way and 3-way versions. An illustration
of a 2-way cable interlock mounted on two drawout circuit
breakers is shown in Figure 79.
Figure 79. Cassette-Mounted 2-Way Cable Interlock
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