3
Instruction Booklet
IB01900004E
Effective July 2016
Magnum breaker remote
racking device (MRR1000)
EATON
www.eaton.com
Section 1: Introduction
Eaton’s MRR1000 provides a means of remotely inserting or
removing any drawout circuit breaker in the Magnum DS
T
family
of power circuit breakers . In addition, the MRR1000 enables the
operator to remotely open and close any Magnum DS circuit breaker
using the pushbuttons on the face of the breaker . Increased safety
precautions and the need to protect personnel from the dangers
of potential arc flash occurrences suggest the need to increase
the distance between an operator and the front of a switchgear
or switchboard during racking operations . With the MRR1000, an
operator can be up to 25 feet away from the breaker compartment
door during the rack-in or rack-out process .
Electric arcs result from thermal ionization that occurs when
current flow is interrupted by the separation of conductors .
Thermal ionization can generate temperatures as high as 35,000 °F .
Conductor materials melt into metal vapor and the surrounding air is
ionized . If the arc is external of the interrupting chamber of a power
circuit breaker, then a violent explosion occurs resulting in an inferno
of ionized gases, molten debris, metal shrapnel, and a flash of light
(arc flash) . When arc flash initiates within a switchgear/switchboard
cabinet, the rapidly escalating pressure can dislodge compartment
doors and side sheets of the switchgear and turn hardware into
high-speed projectiles .
Arc flash levels are a function of circuit voltage, maximum
available short circuit current at the point of flashover, conditions
of confinement, and the distance between the point of flashover
and the point of measurement .
Operating personnel are typically within two feet of the front of the
power circuit breaker during the racking process . In the event of an
arc flash event, this close proximity could cause serious injury or
death . NFPA 70E provides guidance for the requirements of personal
protective equipment (PPE) to protect personnel from the dangers
of arc flash exposure . PPE for high levels of arc flash can be bulky,
hot, and uncomfortable . This may dissuade personnel from wearing
proper protection . The best way to limit exposure to arc flash during
the process of racking power circuit breakers is to put more distance
between the person and the possible point of exposure .
Eaton’s remote racking device fulfills the objective of increased
worker safety by permitting routine operations from an increased
distance from the power circuit breaker .
m
DANGER
WHEN SWITCHGEAR IS CERTIFIED TO BE ARC RESISTANT PER
ANSI C37.20.7, THE ARC-RESISTANT RATING IS ONLY VALID WHEN ALL
DOORS ARE CLOSED AND PROPERLY LATCHED OR BOLTED, AND ALL
COMPONENTS ARE INSTALLED AND WORKING PROPERLY. IN ADDITION,
REMOVAL OF ANY BREAKER FROM ITS CELL WITHOUT REINSTALLING
A BREAKER OR ARC-RESISTANT PROVISION COVER WILL VOID THE
ARC-RESISTANT RATING. FOR COMPLETE INSTRUCTIONS REGARDING
ARC-RESISTANT SWITCHGEAR, SEE IB01900001E, LISTED IN SECTION 7.
1.1 Compatibility
The remote racking device is compatible with any drawout breaker
in the Magnum DS family of power circuit breakers . This includes
the Magnum DS standard frame, narrow frame and doublewide
frame rated for switchgear (ANSI), Magnum SB switchboard class
and IEC 60947-2 applications, as well as CM52 network protector
breakers . The application may be used while enclosed in Magnum
DS low-voltage switchgear and switchboards with the breaker
compartment door closed . The MRR1000 is also compatible with
Magnum DS arc-resistant switchgear and also compatible with
Magnum DS family of drawout power circuit breakers in other
OEM installations .
m
CAUTION
THE CASE DIMENSIONS, RETENTION METHOD, AND OPERATING MECHA-
NISM OF THE MRR1000 ARE DESIGNED TO WORK EXCLUSIVELY WITH THE
MAGNUM DS FAMILY OF POWER CIRCUIT BREAKERS. ANY ATTEMPT TO
USE THE DEVICE WITH ANOTHER MANUFACTURER’S BREAKER WILL PUT
THE OPERATOR AT RISK OF INJURY AND WILL VOID THE WARRANTY.
Unlike some remote operating devices, the MRR1000 requires no
additional mounting kit on the body of the circuit breaker or on the
surface of the switchgear/switchboard . In fact, no modification or
additional tools are required . The MRR1000 utilizes features found
on every breaker of the Magnum DS family, making it convenient to
install and use .
