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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
Figure 100. Magnum DS Lubrication—Levering-in Mechanism
Figure 101. Magnum DS Lubrication—Levering-in Mechanism
Circuit Breaker Modifications And Changes
The topics discussed here will relate to those actions that can
be taken in the field to change, update, maintain or repair a
Magnum SB circuit breaker. This information does not, however,
include most accessory devices. Their installation is covered by
separate instruction leaflets dedicated to the individual devices.
The tasks described here do not, under ordinary circumstances,
require any assistance beyond the appropriate instructional
material. If further assistance is required, however, contact your
Eaton representative.
Rating Plug Replacement
ote:N If a rating plug is not installed in the trip unit, the trip
unit will trip when energized. Also remember that the trip unit’s
rating plug and the circuit breaker’s current sensors must have
matching ratings.
To remove the rating plug from the trip unit, open the small
rating plug door located on the right side of the trip unit (Figure
102). The trip unit’s battery cavity is also located behind this
door. Use a 1/8” wide screwdriver to remove the M4 screw
holding the rating plug in position. Pull the door to release the
rating plug from the trip unit.
Figure 102. Trip Unit Rating Plug Location
To install a new rating plug, insert the rating plug into the cavity
where the other rating plug was removed. Make sure the three
pins on the rating plug are aligned with the sockets in the
cavity. The rating plug should fit with a slight insertion force.
CAUTION
TO PREVENT DAMAGE TO THE RATING PLUG, DO NOT FORCE IT INTO
THE MOUNTING CAVITY.
Use the same 1/8” screwdriver to tighten the M4 screw and
secure the rating plug in the trip unit. The maximum torque on
the mounting screw is 15 in-oz. Close the rating plug door.
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