IB131006EN
Page 32
Effective 07/2017
WARNING
DO NOT PLACE THE CIRCUIT BREAKER IN ITS
COMPARTMENT WITHOUT THE PHASE BARRIERS IN PLACE. THE ABSENCE OF THE BARRIERS COULD
CAUSE A CATASTROHIC FAILURE DURING INTERRUPTION OR OPERATION RESULTING IN DEATH, SEVERE
PERSONAL INJURY AND/OR PROPERTY DAMAGE.
The multiple finger primary disconnect contacts are silver plated and waxed. In order to provide visual indication of the
presence of wax, a blue dye is added during the waxing process to give a bluish color to the disconnect contacts. The
wax acts as a conductive lubricant without attracting dirt. For this reason the contacts do not require any additional
lubricant.
5-3 STORED ENERGY MECHANISM
WARNING
KEEP HANDS AND FINGERS AWAY FROM THE CIRCUIT BREAKER’S INTERNAL PARTS WHILE THE CIRCUIT
BREAKER CONTACTS ARE CLOSED OR THE CLOSING SPRINGS ARE CHARGED. THE CIRCUIT BREAKER
CONTACTS MAY OPEN OR THE CLOSING SPRINGS DISCHARGE CAUSING A CRUSHING INJURY.
DISCHARGE THE SPRINGS AND OPEN THE CIRCUIT BREAKERS BEFORE PER-FORMING ANY CIRCUIT
BREAKER MAINTENANCE, INSPECTION OR REPAIR.
The spring stored energy operating mechanism is arranged vertically in front of all VCP-W circuit breakers (Figure
3-
3
)
.
It includes all the elements for storing the energy, closing and tripping of the circuit breaker, as well as manual
and electrical controls. The manual controls are all front accessible. Motion to close and open the interrupter contacts
is provided through operating rods connecting the mechanism pole shaft to the bell cranks of the interrupter
assemblies.
5-3.1 OPERATION OF STORED ENERGY MECHANISM
The mechanism stores the closing energy by charging the closing springs. The mechanism may rest in any one of the
four positions shown in Figure
5-3
and as follows:
Summary of Contents for VCP-W
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