12
Instructions for Installation, Operation and
Maintenance of Magnum SB Insulated Case
Low Voltage Power Circuit Breakers
EATON CORPORATION
www.eaton.com
Instructional Leaflet
IB2C12063H03
Effective March 2012
CAUTION
DO NOT DISABLE REJECTION INTERLOCKS. DOING SO AND USING
A LOWER CAPACITY CIRCUIT 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 insertion 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 the
rejection interlock pins in the cassette in keeping with those
outlined in Table 1 of IL2C113863 (for MDN/SBN breakers)
and/or Table 1 of IL2C15760 (for MDS/SBS breakers), and
the information supplied on the circuit breaker’s nameplate .
Proceed if the circuit breaker and cassette are compatible .
From Table 3, make a
pin location comparison .
Stop nuts should be
torqued to 8-10 Ft .-Lb .
Figure 8. Cassette Rejection Interlock Pin Positioning/Installation
for Standard and Double-wide Frames
Table 3. Rejection Interlock Pin Locations for Standard and
Double-wide Frames
Pin Locations
Cell For
1
2
3
4
5
6
7
8
SBS-508, 512, 516, 520
X
X
X
SBS-608, 612, 616, 620
X
X
X
X
SBS-C08, C12, C16, C20
X
X
X
X
X
X
SBS-525
X
X
X
SBS-625, 630, 632
X
X
X
X
SBS-C25, C30, C32
X
X
X
X
X
X
SBS-840
X
X
X
SBS-84N
X
X
X
SBS-C40
X
X
X
X
SBS-C4N
X
X
X
X
SBS-E40
X
X
X
X
X
SBS-E4N
X
X
X
X
X
SBS-850, 860
X
X
X
SBS-85N, 86N
X
X
X
SBS-C50, C60
X
X
X
X
SBS-C5N, C6N
X
X
X
X
SBS-E50, E60
X
X
X
X
X
SBS-E5N, E6N
X
X
X
X
X
Table 4. Rejection Interlock Bracket Bolt Locations for Narrow
Frames
Bracket Bolt Locations
Cell For
A
B
C
D
E
SBN-5
X
X
SBN-6
X
X
SBN-C
X
X
From Table 4,
make certain the
two bolts are
in the correct
locations .
A
C
D
B
E
Figure 9. Cassette Rejection Interlock Bracket Location/ Installation
for Narrow Frames
