Magnum
12
1812.900A
2.6.2
Installing secondary jumpers
On drawout circuit breakers the automatic secondary
connector between the circuit breaker and cassette can
be ordered either fully populated or depopulated (without
terminal blocks and jumper wires installed); these parts
can be ordered separately and installed by the customer.
These kits can also be used to add additional secondary
wiring to upgrade circuit breakers in the field.
2.7
Installing drawout circuit breaker
In structures equipped for drawout circuit breakers, a
bolted-in cassette with movable extension rails supports
the circuit breaker. The extension rails must first be pulled
all the way out. Once the rails are fully extended, the
circuit breaker can be carefully placed on the extension
rails.
CAUTION
IT IS IMPORTANT TO TAKE GREAT CARE WHEN
PLACING A DRAWOUT CIRCUIT BREAKER ON ITS
EXTENSION RAILS. IF THE CIRCUIT BREAKER IS
NOT PROPERLY SEATED ON THE EXTENSION
RAILS, IT COULD FALL FROM THE RAILS CAUSING
EQUIPMENT DAMAGE AND/OR BODILY INJURY.
Carefully lower the circuit breaker down onto the
extension rails. Be certain that the circuit breaker’s four
molded drawout rail supports are fully seated in the
extension rail cutouts on both sides (Figure 2-3). Do not
remove the lifting yoke from the circuit breaker until it
is properly seated on the rails.
Once the circuit breaker is on the extension rails and the
lifting yoke is removed, proceed with the rest of the
circuit breaker installation.
From Table 2-2, make a pin location comparison. Stop
nuts should be torqued to 8-10 Ft.-Lb.
Figure 2-4: Cassette Rejection Interlock Pin
Positioning/Installation
Table 2-2: Rejection Interlock Pin Locations
2.7.1
Circuit breaker positioning
The Magnum drawout circuit breaker has four normal
positions:
•
REMOVE (Withdrawn) (Figure 2-5)
•
•
•
The REMOVE position is a position outside the
compartment on the cassette’s drawout rails where the
circuit breaker is not engaged with the levering
mechanism. The DISCONNECT, TEST, and CONNECT,
positions are reached by means of the levering
mechanism.
With the breaker solidly positioned on the cassette’s
extension rails and levering-in mechanism in the
DISCONNECT position, carefully and firmly push the
circuit breaker into the compartment as far as it will go.
The outer (recessed) portion of the circuit breaker face
plate should align with the GREEN target line (labelled
DISC) on the inside top left wall of the cassette
(Figure 2-9).
Pin Locations
Cell for
1
2
3
4
5
6
7
8
MWN-408,
412
x x
MWN-508, 512, 516, 520
x
x
x
MWN-608, 612, 616, 620
x
x
x
x
MWI-608, 612, 616, 620
x
x
x
x
MWI-808, 812, 816, 820
x
x
x
x
x
MWI-C08, C12, C16, C20
x
x
x
x
x
x
MWI-625,
632
x x x x
MWI-825,
832
x x x x x
MWI-C25,
C32
x x x x x x
MWI-640
x x x
MWI-64N
x x x
MWI-840
x x x
MWI-84N
x x x
MWI-C40
x x x x
MWI-C4N
x x x x
MWI-E40
x x x x x
MWI-E4N
x x x x x
MWI-850,
863
x x x
MWI-85N,
86N
x x x
MWI-C50, C63
x
x
x
x
MWI-C5N,
C6N
x x x x
MWI-E50,
E63
x x x x x
MWI-E5N,
E6N
x x x x x
MWK-225,
232
x x x x x
