Section Ii - G Eneral Description; General - Eaton CM52 Instruction Booklet

2
Instruction Booklet IB 52-01-TE
Effective October 2010

2.0 GENERAL

Type CM52 network protector is a special air
circuit breaker equipped with a relay that
operates in response to voltage across the
protector or current through the protector. This
relay caus es the protector to close or to open as
required by the conditions between the network
and the feeder trans formers. Control power is
taken directly from the system and therefore no
separate power source is required.
CM52 units are available as standard, for
216Y/125 volts, 480Y/277 volts at 60 Hertz,
with other voltages as well as 50 Hertz units
available upon request.
Type CM52 Netw ork Protectors are
protectiv e dev ices. As such, they are
maximum current rated devices.
Therefore, they should not under any
circumstances be applied outside of their
ratings , w hich could cause the
equipment to fail, resulting in severe
personal inj ury, death, or property
Fig. 3 NPL Fuse Housing (external fuses)
Effective 11/05/08 (super cedes 11/19/03) IB 52-01-TE
2
EATON COrPOrATION www.eaton.com
S ECTION II - GENERAL DES CRIPTION
CAUTION
damage.
Instructions for the Eaton Type CM52
Network Protectors 800 to 4500 Amperes
The standard submersible enclosure is equipped
with type NPL fuses in externally mounted fuse
housing located on top of the network body. The
CM52 is also available with internal fuses.
The normal power flow is in at the throat from
the trans former, down to the trans former side
disconnect device on the levering-out unit, up
through the unit to the network side disconnect
device, out the top of the enclosure into the fuse
housings, through the fuse to the supplied
mounting terminal.
Fig. 3A (Internal fuses)
IB -52-01-TE
2