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Instruction Book
IB182012EN March 2017 www.eaton.com
50DH-VR-50AXU / 50XU / 75U / 75ARU - 600 / 1200A
Replacement Circuit Breaker
SECTION 2: SAFE PRACTICES
VR-Series circuit breakers are equipped with high speed, high
energy operating mechanisms. They are designed with several built-
in interlocks and safety features to provide safe and proper operating
sequences.
DANGER
TO PROTECT THE PERSONNEL ASSOCIATED WITH INSTALLATION,
OPERATION, AND MAINTENANCE OF THESE CIRCUIT BREAKERS, THE
FOLLOWING PRACTICES MUST BE FOLLOWED:
•
Only qualified persons, as defined in the National Electrical
Safety Code, who are familiar with the installation and
maintenance of medium voltage circuits and equipment,
should be permitted to work on these circuit breakers.
•
Read these instructions carefully before attempting any
installation, operation or maintenance of these circuit
breakers.
•
Always remove the circuit breaker from the enclosure before
performing any maintenance. Failure to do so could result in
electrical shock leading to death, severe personnel injury or
property damage.
•
Do not work on a circuit breaker with the secondary test
coupler engaged. Failure to disconnect the test coupler could
result in an electrical shock leading to death, personnel injury
or property damage.
•
Do not work on a closed circuit breaker or a circuit breaker
with closing springs charged. The closing spring should be
discharged and the main contacts open before working on
the circuit breaker. Failure to do so could result in cutting or
crushing injuries.
•
Do not use a circuit breaker by itself as the sole means of
isolating a high voltage circuit. Remove the circuit breaker
to the Disconnect position and follow all lockout and
tagging rules of the National Electrical Code and any and all
applicable codes, regulations and work rules.
•
Do not leave the circuit breaker in an intermediate position
in the cell. Always have the circuit breaker either in the Test
or Connected position. Failure to do so could result in a
flash over and possible death, personnel injury or property
damage.
•
Circuit breakers are equipped with safety interlocks. Do
not defeat them. This may result in death, bodily injury or
equipment damage.
