40
User Manual MN013016EN
Effective July 2022
Magnum PXR and Power Defense SB low
voltage power circuit breakers user manual
EATON www.eaton.com
Section 5: Drawout circuit breaker
and cassette
General
Section 3 discussed topics and features common to all Magnum
PXR and PD-SB circuit breakers, no matter what the mounting
configuration or type (drawout or fixed). In this section, features
unique to the drawout type circuit breaker and drawout cassette,
not covered elsewhere, are discussed. Section 6 covers features
unique to fixed type circuit breakers only. Drawings and dimensions
associated with all circuit breakers, drawout cassettes, and any
appropriate primary bus connections can be found in the technical
product guide (PA013006EN), available on the website at
www.eaton.com/magnumpxr The installation and the levering of a
drawout circuit breaker were discussed in Section 2. If necessary,
review that information, because it will not be repeated here.
Drawout cassette
A drawout circuit breaker is used in combination with a fixed
drawout cassette (Figure 64 and Figure 66); the drawout circuit
breaker is equipped with automatic primary disconnects
Figure 65. The cassette provides all of the necessary interfaces
to the drawout circuit breaker, including automatic primary and
secondary connections. For the narrow frame circuit breaker, a
single cassette style using horizontal stabs and horizontal customer
busbar terminals is available (Figure 67). The 4000A and 5000A
double narrow cassettes utilize an interleaved style connection on
the back of the cassette to make it easier to install standard bus
bar thicknesses. For the MPS standard and double-wide circuit
breakers, two cassette types, are available: basic, and universal. The
basic cassette supplies vertical stab/terminals only (Figure 68). The
basic cassette is available without the copper stab/terminals so that
these pieces can be integrated with vertical busbars provided by the
switchgear builder (Figure 69). The universal cassette provides a set
of flat pad terminals on the rear of the cassette that can be adapted
to vertical, horizontal, or front connection (Figure 70). Mounting
locations for cell (TOC) switches, safety shutters, mechanical
interlocks, terminal block extension bracket, and key interlocks are
provided on the cassette.
Figure 64. MPS/SPS drawout circuit breaker in cassette
Figure 65. MPS/SPS drawout circuit breaker with automatic
primary disconnects
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