Magnum
50
1812.900A
WARNING
ARC CHUTES MUST ALWAYS BE SECURED
PROPERLY IN PLACE BEFORE A CIRCUIT BREAKER
IS INSTALLED IN A CIRCUIT BREAKER
COMPARTMENT. FAILURE TO DO THIS COULD
RESULTS IN EQUIPMENT DAMAGE, BODILY INJURY
OR EVEN DEATH.
Once the inspection is complete, be sure the arc chutes
are properly replaced as previously described in
paragraph 6-4.2.
Side-to-Side
Ledge
Side-to-Side
Ledge
Contact Wear Indicator - Contacts Closed
and in Good Condition
Contact Wear Indicator - Contacts
Closed and Wear is Indicated
Figure 6-5: Use of Contact Wear Indicator with Circuit Breaker Closed
6.5
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 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.
6.5.1
Rating plug replacement
NOTICE
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 6-6). 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.
Contact Wear
Inspection Area
(Ledge Not Visible Under
Contacts)
Contact Wear
Inspection Area
(Ledge Now Becoming
Visible Under Contacts)
