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Instruction Book
IB182023EN March 2016 www.eaton.com
AMH-4.76-VR
Replacement Circuit Breaker
interlock accomplishes this by providing a trip signal to the breaker
automatically from the racking mechanism interlock cams whenever
the breaker is in an intermediate position in the cell and adding a
close signal between the DISCONNECT and WITHDRAWN positions
to render the breaker trip-free prior to leaving the cell (close and
open springs discharged).
WARNING
DO NOT FORCE THE BREAKER INTO THE CELL. DOING SO MAY DAMAGE
PARTS THEREBY RISKING DEATH, PERSONAL INJURY, AND/OR PROPERTY
DAMAGE.
4.8 MISCELLANEOUS ITEMS
4.8.1 MOC OPERATOR
The MOC switch is external to the circuit breaker and mounted
within the confines of the switchgear cubicle. The breaker’s MOC
operator interfaces with the cell MOC switch in the same manner as
the original breaker being replaced. All VR-Series breakers, which are
supplied with MOC operators, are engineered with patented
SURE
CLOSE
Technology. This technology decouples the MOC operator
from the main breaker operating mechanism. This prevents the MOC
switch from stalling the circuit breaker during a closing operation,
preventing damage to the cell MOC components, and extends the
life of the MOC switch.
WARNING
EXTREME CARE SHOULD BE TAKEN TO AVOID PERSONNEL OR EQUIPMENT
CONTACT WITH THE MOC SYSTEM WHEN OPERATING THE BREAKER DUE
TO THE ASSOCIATED MECHANICAL FORCE. CONTACT WITH THE MOC
OPERATOR DURING OPERATION COULD RESULT IN INJURY.
4.8.2 OPERATIONS COUNTER
All AMH-4.76-VR breakers are equipped with a mechanical
operations counter (Figures 3.3). As the breaker opens, the linkage
connected to the pole shaft lever advances the counter reading by
one.
