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Instruction Leaflet IL02401001E
Effective August 2009
Warning
only certified and competent personnel should attempt to
install or maintain potentially hazardous equipment.
do not attempt to install or perform maintenance on equip-
ment While it is energized. death or severe personal injury
can result from contact With energized equipment. alWays
verify that no voltage is present before proceeding. alWays
folloW safety procedures.
eaton is not liable for the misapplication or misinstallation
of its products.
caution
observe all recommendations, notes, cautions, and Warnings
relating to the safety of personnel and equipment. observe
and comply With all general and local health and safety
laWs, codes, and procedures.
caution
a flash hazard analysis should be done to determine personal
protective equipment requirements.
2
EAtoN CoRPoRAtIoN www.networkprotectors.net
with Arc Flash Reduction Module
1.0 General
Per the previous WARNING, it is highly recommended that mainte-
nance be conducted on electrical equipment including circuit break-
ers with the system de-energized .
For situations that arise where this is not possible, the Maintenance
Mode function of the CM52 Network Protector can reduce arc flash
incident energy that is generated on a fault condition . This is accom-
plished by a analog trip circuit which, when armed, provides a fast
acting response to the fault . The reduced arc condition will occur
only in devices downstream of the unit in Maintenance Mode . The
Maintenance Mode indicator LED is located in the upper portion of
the unit .
2.0 Maintenance Mode Setting
The Maintenance Mode Setting is fixed at 2 .5 times the rating of the
installed Network Protector .
3.0 Arming Maintenance Mode
There are two ways to arm the Maintenance Mode Arc Flash
Reduction setting .
A remote switch wired through the breaker secondary contacts can
remotely arm the Maintenance Mode setting . A high quality, gold
plated or palladium contact is required in this application . The blue
LED on the unit's front will verify that the function is armed . (See
wiring diagram on page three .)
A second method to arm the maintenance setting is via a communi-
cation device .
When Maintenance Setting is enabled via device communications,
this setting must be disabled by device communications .
4.0 Remote Indicator
The CM52 breaker will be wired with a secondary contact which can
be used to indicate remotely that the Maintenance Setting is armed .
(Refer to diagram on page three for a wiring of this remote {blue
light] indicator .)
5.0 Tripping and Testing
The Maintenance Mode function will provide fast tripping to reduce
the arc flash incident energy . The Maintenance Mode Trip LED posi-
tion is used to indicate a trip initiated by the Maintenance Mode
setting .
The Maintenance Setting, external wiring (if any) and tripping func-
tionality should be periodically verified by primary or secondary injec-
tion current testing .
CM52 Network Protector
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