Circuit Breaker Modifications And Changes; 6-5.1 Rating Plug Replacement - Eaton MDN-408 Instructions For Installation, Operation And Maintenance

Side-to-Side
Ledge
Contact Wear Indicator - Contacts
Closed and in Good Condition
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, main-
tain or repair a Magnum circuit breaker. This informa-
tion 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 circum-
stances, require any assistance beyond the appropriate
instructional material. If further assistance is required,
however, contact your Cutler-Hammer 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 break-
er's current sensors must have matching ratings.
I.B. 2C12060H08
Contact Wear
Contact Wear
Inspection Area
Inspection Area
(Ledge Not Visible
Under Contacts)
For more information visit: www.EatonElectrical.com
Effective: May 2006
Contact Wear Contact Wear
Inspection Area Inspection Area
(Ledge Now Becoming
Visible Under
Contacts)
Contact Wear Indicator - Contacts
Closed and Wear is Indicated
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.
Figure 6-6 Trip Unit Rating Plug Location
Instruction Book
Page 64
Side-to-Side
Ledge
Rating Rating
Plug
Plug