53
Instructional Leaflet
IB2C12063H03
Effective March 2012
Instructions for Installation, Operation and
Maintenance of Magnum SB Insulated Case
Low Voltage Power Circuit Breakers
EATON CORPORATION
www.eaton.com
Cassette Safety Shutters
Automatically operated insulating type safety shutters are
available for use with the drawout cassette . When the drawout
circuit breaker is levered from the CONNECT position, the
shutters automatically close to cover the fixed primary contacts
(
Figure 73
) . When the circuit breaker is levered into the
cassette, the shutters automatically open permitting primary
connections to be made (
Figure 74
) .
Figure 73. Typical Safety Shutters in Closed Position
Figure 74. Typical Safety Shutters in Open Position
Cassette Cell Switch
The cassette cell switch is a compartment position switch for
drawout circuit breakers . It is available in a 2a2b or 4a4b con-
tact configuration, and mounts on the right side of the cassette
(
Figure 75 and 76
) . Refer to
Table 9
for cell switch contact
information . The cell switch changes status between the TEST
and CONNECT positions .
Door Escutcheon
The door escutcheon is a molded frame used to seal the space
between the circuit breaker and the compartment door cutout .
It is supplied with a mounting gasket (
Figure 77
) .
Figure 75. Cell Switch (Drawout Position Indicator) Unmounted
Figure 76. Cell Switches Mounted on Cassette
Figure 77. Door Escutcheon and Gasket
