5
Instructional Booklet
IB013003EN
Effective June 2023
Instructions for installation, operation,
and maintenance of Magnum MR2
(integral racking)
EATON
www.eaton.com
Manual racking
m
CAUTION
DO NOT USE AN ELECTRIC OR PNEUMATIC DRIVER TO RACK THE
BREAKER.
In the case where electrical racking is not available, the breaker
can be manually racked using a standard 3/8-inch square drive and
ratchet (not provided) .
Do not use an electric or pneumatic driver
to rack the breaker.
Raise the racking door to gain access to the
levering screw . (Electrical operation will be disabled when door is
open .) Insert the levering tool into the square socket to unlock the
internal mechanical clutch . You may need to forcefully “pop” the
end of the ratchet in some cases . You will not be able to rotate the
levering tool until this occurs (see Figure 10) . Once “un-locked”, the
levering tool can be rotated clockwise to rack into test and connect .
It can be rotated counter-clockwise to rack to test and disconnect
(see Figure 11) . Do not exceed 25 ft-lb (33 .9 N·m) of torque . The
clutch will automatically re-engage once inward force on the tool is
released .
Figure 10. “Un-locking” the
clutch.
Figure 11. Manual racking.
Racking indication
While
electrical or manual racking, there exists three discrete colored
positions which are disconnect (green), test (yellow), and connect
(red) (see positions A, B, and C in Figure 12) . At these positions, the
breaker can be closed when the racking door is fully lowered .
Figure 12. Discrete colored positions.
If racking is stopped (electrically or manually) in between disconnect
/test or test/connect positions, there is no complete single colored
block in these mid-positions (see Figure 13) . At these positions,
the breaker will not be allowed to close . If the racking door is
lifted, electric racking will be disabled and the door will be “held
up” providing additional indication that breaker is not in a discrete
position (see Figure 14) .
Figure 13. Mid-positions.
Figure 14. Door lifted and
held up.
Once the door is “held up”, you can release the door 2 ways . Option
1 is to insert a racking tool and manually rack to a discrete colored
position, until the door is allowed to drop . Option 2 is to insert a
small tool through the door latch release hole, and “push in” to
release the internal door latch . With the tool in, you can push down
on the racking door (see Figure 15 and Figure 16) . You can resume
electrical racking by clearing the E4 error code . See Diagnostics/
troubleshooting section for more information .
Figure 15. Door latch release
hole.
Figure 16. Release door.
A
B
C
