SECTION 4: DRAWOUT CIRCUIT
BREAKER AND CASSETTE
4-1 GENERAL
Section 3 discussed topics and features common to all
Magnum circuit breakers, no matter what the mounting
configuration or type (drawout or fixed, MDS, MDSX or
MDSL). In this section, features unique to the drawout
type circuit breaker and drawout cassette, not covered
elsewhere, are discussed. Section 5 covers features
unique to MDS and MDSX fixed type circuit breakers
only. Drawings and dimensions associated with all cir-
cuit breakers, drawout cassettes and any appropriate
primary bus connections can be found in a separate
document entitled Engineering Data TD01301004E.
The installation and levering of a drawout circuit breaker
were discussed in Section 2. If necessary, review that
information, since it will not be repeated here.
4-1.1 DRAWOUT CASSETTE
A drawout circuit breaker is used in combination with a
fixed drawout cassette (Figures 4-1 and 4-3); the dra-
wout circuit breaker is equipped with automatic primary
disconnects (Figure 4-2). The cassette provides all of
the necessary interfaces to the drawout circuit breaker
including automatic primary and secondary connections.
For the MDS narrow frame circuit breaker a single cas-
sette style using horizontal stabs and horizontal cus
tomer bus bar terminals is available (Figure 4-4). For
the MDS and MDSX standard and double-wide circuit
breakers three cassette styles, all with vertical stabs,
are available: basic, standard, and universal. The stan-
dard cassette supplies vertical stab/terminals only
(Figure 4-5). The basic cassette omits the copper
stab/terminals so that these pieces can be integrated
with vertical bus bars provided by the switchgear builder
(Figure 4-6). 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
(Figures 4-7). The MDSL circuit breaker with integral
current limiters is six inches deeper than the MDS or
MDSX circuit breaker and utilizes a cassette similar to
the MDS and MDSX standard type cassette except six
inches deeper (Figure 4-8 and 4-9). Mounting locations
for cell (TOC) switches, safety shutters, mechanical
interlocks and key interlocks are provided on the cas-
sette.
I.B. 2C12060H08
For more information visit: www.EatonElectrical.com
Instruction Book
Page 55
Effective: May 2006
Figure 4-1 MDS/MDSX Drawout Circuit Breaker in
Cassette
Figure 4-2 MDS/MDSX Drawout Circuit Breaker with
Automatic Primary Disconnects
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