52
Instructions for Installation, Operation and
Maintenance of Magnum SB Insulated Case
Low Voltage Power Circuit Breakers
EATON CORPORATION www.eaton.com
Instructional Leaet IB2C12063H03
Effective March 2012
Mechanical Accessories
There are eight optional mechanical type accessories:
• Operations Counter
• Off Key Lock
• Cassette Lock
• Pushbutton Cover
• Prevent Close Cover
• Cassette Safety Shutters
• Cassette Cell Switch
• Door Escutcheon
• Waterproof Cover
• Mechanical Interlock
Operations Counter
The operations counter is a mechanical device used to provide
a record of the number of circuit operations. It is mounted in
the lower right portion of the circuit breaker and can be viewed
through the front cover (Figure 70).
Off Key Lock
The “off” key lock secures the circuit breaker in the “OFF”
position. It is mounted in the lower right portion of the circuit
breaker and can be viewed through the front cover (Figure 70).
The customer supplies the key lock. The provisions available are
for Kirk, Castell, Ronis or CES.
Cassette Lock
A cassette mounted lock can be used in conjunction with
different interlocking schemes (such as main-tie-main) (Figure
71). The lock holds the circuit breaker trip-free in the connected
position, preventing it from being closed.
Figure 71. Cassette Mounted Key Lock
Up to three lock cylinders can be installed on one cassette.
Eaton supplies the lock provisions only. The customer is
responsible for the locks, which can be Kirk, Castell, Ronis or
CES.
Pushbutton Cover
Padlockable covers are available to limit access to the “ON”
and “OFF” pushbuttons (Figure 72). They can be installed with
either or both pushbutton covers in place.
Prevent Close Cover
All access to the “ON” pushbutton can be prevented by adding
the fixed Prevent Close Cover to the pushbutton cover.
Lockout Cover
When padlocked, it maintains the “OFF” button in the actuated
position which prevents closure of the breaker.
Figure 72. ON-OFF Pushbutton Lockable Cover Plate
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