6
Instruction Booklet
IB01900004E
Effective July 2016
Magnum breaker remote
racking device (MRR1000)
EATON
www.eaton.com
Section 4: Procedures
4.1 General
Magnum DS switchgear and switchboard enclosures use a
“Thru-the-Door” racking method that increases operator safety
when inserting or removing power circuit breakers . The MRR1000
permits operation while the breaker compartment door remains
closed, even in arc-resistant enclosures . However, in some OEM
supplied enclosures, “Thru-the-Door” racking may not be possible .
The MRR1000 is fully functional and not reliant on the presence
or absence of a door to operate . However, for the purposes of
this instruction, it will be assumed the breaker compartment door
is closed .
Follow all procedures defined by the using company’s Personal
Protective Equipment and Safety Policy . Follow all precautions and
requirements listed in the installation, operating, and maintenance
instructions of the subject circuit breakers .
4.2 Unpacking—preparations for use
1.
Remove all packing materials, unwind power cord and pendant
control cord .
2.
Obtain 120 Vac power . Use of a standard extension cord is
permissible with a minimum of 6 A current capacity .
3.
Connecting power to the unit will activate the “READY” light
on the faceplate (there is no “on/off” switch) . However, no
operation will begin until use of pendant buttons as described
in Steps 4 .3 .3 and 4 .4 .3, below .
4.3 Procedure for removing a power circuit breaker
4.3.1 Installation on the circuit breaker face
1.
The face of a typical Magnum DS circuit breaker is shown in
Figure 1
. Note the small recessed cavity in the upper right hand
corner . This cavity is the principal element for retention of the
MRR1000—ensure this cavity is free from contaminants such
as dust, grease, or oil .
2.
Ensure the shaft/motor assembly is in the rear-most position .
Pull the handle attached to the shaft/motor assembly firmly
rearward to verify the assembly is seated in the rear detent .
3.
Ensure the locking handle is in the unlocked position (
Figure 2
) .
If the handle is in the locked position, pull out on the locking pin
as shown to release the handle .
4.
Lift the MRR1000 to the level of the selected power
circuit breaker .
5.
Align the top flange and two side flanges of the housing with
the nose of the circuit breaker and insert through the breaker
compartment door . The rubber gasket that surrounds the breaker
face will easily push aside . (On arc-resistant style breaker doors,
the retractable bellows will also permit insertion of the remote
racking device .)
Accessory window
(recessed cavity)
Contact and spring
status indicators
Open/close
buttons
Manual
charging
handle
Levering device
access door
Position
indicator
Figure 1. Magnum DS circuit breaker
To release handle pull locking
pin in direction shown
Locking pin
Locking handle
Figure 2. MRR1000 locking handle
