Installation Manual

3A74374H04 Page 14
Effective 03/13
Table 1.8 (ANSI Standards) Type VCP-W ( K=1) Vacuum Circuit Breaker Through 15 kV Rated Symmetrical Current
Basis (Standard Ratings)
Identification Rated Values
Voltage Insulation Level Current Current Values
Withstand Test
Volta
g
e
Nominal
Voltage
Class
Maximum
Voltage
E
Voltage
Range
Factor
K
Power
Frequency
(1 Min.)
Impulse
Continuous
Current
at 60 Hz
Short
Circuit
Current
(at Rated
Max. kV)
I
Inter-
rupting
Time 
Permis-
sible
Tripping
Delay
Y
Maximum
Voltage
Divided
By K
E/K
Closing
and
Latchin
g
Capabil
ity
2.6 K
Times
Rated
Short
Closing
and
Latching
Capability
Momentary
1.6 K
Times
Rated
Short
Circuit
Current
Circuit
Breaker
Type
kV kV rms kV rms
kV Peak
Amperes kA rms ms or cy Seconds kV rms kA Peak kA rms
50VCP-W 25 4.16 4.76 1.0 19 60 1200
2000
3000
25 50 or 83 2 4.76 65 39
50VCP-W 40 4.16 4.76 1.0 19 60 1200
2000
3000
40 50 or 83 2 4.76 104 62
50VCP-W 50 4.16 4.76 1.0 19 60 1200
2000
3000
50 50 or 83 2 4.76 130 78
50VCP-W 63 4.16 4.76 1.0 19 60 1200
2000
3000
63 50 or 83 2 4.76 164 98
75VCP-W 40 7.2 8.25 1.0 36 95 1200
2000
3000
40 50 or 83 2 11.5 104 62
75VCP-W 50 7.2 8.25 1.0 36 60 1200
2000
3000
50 50 or 83 2 11.5 130 78
150VCP-W 25 13.8 15 1.0 36 95 1200
2000
3000
25 50 or 83 2 15.0 65 39
150VCP-W 40 13.8 15 1.0 36 95 1200
2000
3000
40 50 or 83 2 15.0 104 62
150VCP-W 50 13.8 15 1.0 36 95 1200
2000
3000
50 50 or 83 2 15.0 130 78
150VCP-W 63 13.8 15 1.0 36 95 1200
2000
3000
63 50 or 83 2 15.0 164 98
 Applicable ANSI Standards C37.04-1979, C37.09-1979 andC37.01987.
Operating Duty Cycle CO-15 seconds-CO. Operating Time Values:
Opening 30-45 ms, Closing 45-60 ms and Reclosing 18 cycles (300 rms).

Consult Application Data 32-265 for further information.
 Optional interrupting time of 3 cycles is available.
 Also 3-second short time current carrying capability.