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Operation and maintenance of
IZM low voltage air circuit breakers
MOELLER www.moeller.net/de/support
10/09 AWB1230-1605
Effective October 2009
Pushbutton cover—A padlockable cover is available to limit access
to the ON and OFF pushbuttons (Figure 55). It can be installed with
either or both pushbutton covers in place.
Figure 55. ON-OFF Pushbutton Lockable Cover Plate
Prevent close cover—Complete access to the ON pushbutton can
be prevented by adding the prevent close cover to the pushbutton
cover.
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 56). When the circuit breaker is levered into
the cassette, the shutters automatically open permitting primary
connections to be made (Figure 57).
Figure 56. Safety Shutters in CLOSED Position
Figure 57. Safety Shutters in OPEN Position
Cassette cell switches—The cassette cell switches are compart-
ment position switches for drawout circuit breakers. They are
available in 4 change-over contact configuration, and mount on the
right side of the cassette (Figure 58 and Figure 59). Refer to the
ratings in Table 9 for cell switch contact information. One or more
cell switches can be mounted to operate at the WITHDRAWN,
TEST, or CONNECT position.
Figure 58. Cell Switch (Drawout Position Indicator) Unmounted
Figure 59. Cell Switches Mounted on Cassette
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