I.B. 32-255-1G
Page 24
Effective 12/02
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 sil-
ver plated and waxed. In order to provide visual indica-
tion of the presence of wax, a blue dye is added during
the waxing process to give a bluish color to the discon-
nect 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
KEEP HANDS AND FINGERS AWAY FROM THE CIR-
CUIT BREAKER’S INTERNAL PARTS WHILE THE
CIRCUIT BREAKER CONTACTS ARE CLOSED OR
THE CLOSING SPRINGS ARE CHARGED. THE CIR-
CUIT 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 con-
trols 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:
Table 5.1 VCP-W Circuit Breaker Barrier Configurations
WARNING
Approximate
ANSI Vacuum
Breaker Interrupter Number
Identification Amps Diameter-Inches of Barriers
50VCPW-ND250 1200 4 0
50VCP-W250 1200 4 2
2000 5 4
3000 7 2 + 2 in cell
50VCP-W350 1200 7 or 5 2 + 2 in cell
2000 7 or 5 2 + 2 in cell
3000 7 2 + 2 in cell
75VCP-W500 1200 5 or 4 4 or 2
2000 5 4
3000 7 2 + 2 in cell
150VCP-W500 1200 4 or 3 2
2000 5 4
3000 7 2 +2 in cell
150VCP-W750 1200 4 2
2000 5 4
3000 7 2 + 2 in cell
150VCP-W1000 1200 7 or 5 2 + 2 in cell
2000 7 or 5 2 + 2 in cell
3000 7 2 + 2 in cell
150VCP-W63 1200 7 2 + 2 in cell
2000 7 2 + 2 in cell
3000 7 2 + 2 in cell
270VCP-W 630 4 2 + 2 in cell
1200 4 or 5 2 + 2 in cell
2000 5 2 + 2 in cell
Number of Barriers — Key
2..........................Two phase-to-ground barriers on the breaker.
4..........................Two phase-to-ground and two phase-to-phase barri-
ers on the breaker.
2 + 2 in cell..........A group of two or two separate barriers on the
breaker and two exterior barriers mounted on the
sides of the cell.
Note: Although only standard ANSI rated VCP-W breakers are
given in these configurations, all VCPW-SE and IEC rated
breakers follow the same barrier configurations based on
the diameter of the vacuum interrupter.
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