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Instructions for the Eaton Type CM52
Network Protectors 800 to 4500 Amperes
3
Fig. 4
CM52 w/Breaker Element withdrawn
On rails
Opening the Enclosure
The CM52 enclosure incorpo rates a hinge
design, which is separate from the door bolt
hardware.
CAUT ION
- make sure that each bolt has b een
fully ext ended before attempting to swing the
door open. Having completed that, the door can
be swung into its full position.
NOTE: With the door closed and the door
hardware lagged down, the hinge and door lifting
attachments can be switched fo r opposite door
opening, without breaking the door seal.
outside operating handl e and associated s witch,
mounted inside the enclosure, can be switched to
the opposite side once the door has been opened.
2.1 CM52 NETWORK PROTECTORS
The complete network unit consists of the air
circuit breaker and its associated relaying
equipment consisting of four major elements.
2.1.1 Cassette Frame
The supporting structure of the break er and relay
module is mounted directly in the enclosure.
2.1.2
Circuit Breaker
Each contains arc chut es, contact system, current
trans formers, primary and secondary disconnect
2.1.2.1 Arc chutes
Arc Chutes are designed and construct ed to
entrap the splitter plates.
Effective 11/05/08 (super cedes 11/19/03) IB 52-01-TE
A single captive hold-down s crew is located in
Levering
the rear of each arc chute to facilitate its
Crank
removal.
Circuit
Breaker
Control
Module
Lifting
Brackets
Fig. 5 Arc Chute
2.1.2.2 Current Transformers
Current trans formers located on the rear of the
circuit
breaker
construction with exposed fast-on terminals.
2.1.2.3 Operating Mechanism
The operating mechanism , located on the front
of the circuit breaker, consists of an independent
The
spring-closing
motor, and trip device.
2.1.2.4 Control Module
The control module consists of switches; rel ays,
trans former and secondary disconnect points. It
is electrically connected to the operating
mechanism by plugs and sockets.
Relay Module Layout
The relay module of the CM52 has a swing open
front panel that permits the replacement of the
CPT, PT's (480V) and all of the rel ay module
control wiring. The hinged front panel has the
mounting of the MPC series relay and the Test
switch.
Once the front panel has been swung open, the
Auxiliary Switch and Secondary Connection
Block is mounted in the lower center portion of
the rel ay module, see figure 6. This device is a
DIN rail mounted terminal block.
factory wiring has been made on the rear ports of
Instruction Booklet IB 52-01-TE
Effective October 2010
IB -52-01-TE
and
are
molded
frame
mechanism;
spring
charging
All of the
EATON COrPOrATION www.eaton.com
3
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