I.B. 2C12060H08
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Instruction Book
Page 7
Effective: May 2006
DO NOT DISABLE REJECTION INTERLOCKS.
DOING SO AND USING A LOWER CAPACITY CIR-
CUIT BREAKER IN AN INCOMPATIBLE CASSETTE
COULD RESULT IN AN ELECTRICAL FAULT WHICH
COULD RESULT IN DEATH, BODILY INJURY
AND/OR EQUIPMENT DAMAGE.
The rejection interlocks are steel pins in the floor of the
circuit breaker cassette. As the circuit breaker is
pushed into the structure, the mating pins on the bottom
of the circuit breaker move past a set of corresponding
pins in the cassette, if the circuit breaker and cassette
are compatible. If the circuit breaker and the cassette
are mismatched, the rejection pins will block the inser-
tion of the circuit breaker into the cassette before the
levering-in mechanism is engaged.
Before attempting to push the circuit breaker into the
DISCONNECT position, compare the positioning of
rejection interlock pins in the cassette in keeping with
Table
2.2
and Figure
2-5
and the information supplied
on the circuit breaker’s nameplate. Proceed if the circuit
breaker and cassette are compatible.
2-6.2 CIRCUIT BREAKER POSITIONING
Magnum DS, DSX and DSL drawout circuit breakers
have four normal positions:
• REMOVE (Withdrawn) (Figure
2-6
)
• DISCONNECT (Figure
2-7
)
• TEST (Figure
2-8
)
• CONNECT (Figure
2-9
)
The REMOVE position is a position outside the com-
partment on the cassette’s drawout rails where the cir-
cuit breaker is not engaged with the levering mecha
!
CAUTION
nism. The DISCONNECT, TEST, and CONNECT, posi-
tions are reached by means of the levering mechanism.
With the breaker solidly positioned on the cassette’s
extension rails and the 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
2-10
).
Figure 2-5 Cassette Rejection Interlock Pin
Positioning/Installation
From Table 2.2, make a
pin location comparison.
Stop nuts should be
torqued to 8-10 Ft.-Lb.
Table 2.2 Rejection Interlock Pin Locations
1
2
3
4
5
6
7
8
Pin Locations
Cell For:
1 2 3 4 5 6 7 8
MDN-408, 412, 416
MDN-508, 512, 516
MDN-608, 612, 616
MDS-408, 412, 416
MDS-508, 512, 516, 520
MDS-608, 612, 616, 620
MDS-808, 812, 816, 820
MDS-C08, C12, C16, C20
MDS-525
MDS-625, 630, 632
MDS-825, 830, 832
MDS-C25, C30, C32
MDS-840
MDS-84N
MDS-C40
MDS-C4N
MDS-E40
MDS-E4N
MDS-850, 860
MDS-85N, 86N
MDS-C50, C60
MDS-C5N, C6N
MDS-E50, E60
MDS-E5N, E6N
MDSL08
MDSL12
MDSL16
MDSL20
MDS-X08
MSD-X12
MDS-X16
MDS-X20
MDS-X3N
MDS-X4N
MDS-X5N
MDS-X32
MDS-X40
MDS-X50
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X-LG
X-LG
X-LG
X-LG
X-LG
X-LG
X-LG
X-LG
X-LG
X-LG
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
NOTE: X-LG IN TABLE 2.2 DENOTES LONG LENGTH STOP NUT 0.760 INCHES LONG
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