Installation Manual

3A74374H04 Page 12
Effective 03/13
Table 1.4 (ANSI Standards) Type VCP-WG Generator Vacuum Circuit Breaker Through 5-15 kV Rated Symmetrical
Current Basis
Identification Rated Values
Voltage
Insulation Level
Current
Withstand Test Voltage
Maximum
Voltage
E
Voltage
Range Factor
K
Power Frequency
(1 minute)
Impulse
Continuous
Current
at 60 Hz
Short Circuit
Current (at
Rated
Maximum kV)
I
Interrupting
Time
Permissible
Tripping
Time
Y
Maximum
Voltage
Divided by K
E/K
Peak
Voltage
E2
Time-to-
Peak
t2
Close and Latch
Capability
Momentary
Circuit
Breaker Type
kV rms kV rms kV Peak Amperes kA rms Cycles Seconds kV rms kV µs kA Peak
50VCP-WG50 4.76 1 19 60 1200
2000
3000
50 3 2 4.76 27 8.8 137
50VCP-WG63 4.76 1 19 60 1200
2000
3000
63 3 2 4.76 28 9.0 173
150VCP-WG50 15.0 1 36 95 1200
2000
3000
50 3 2 15.0 27 3.5 137
150VCP-WG63 15.0 1 36 95 1200
2000
3000
63 3 2 15.0 28 3.5 173
Table 1.5 (IEC-56 Standards
 ) Type VCP-W Vacuum Circuit Breaker Through 17.5 kV Rated Symmetrical Current Basis
Identification
Rated values
Insulation level
Normal Current Short circuit
Breaking current
3 Second Short
Time Current
Short Circuit
Making Current
Cable Charging
Breaking Amps
Voltage Class
Power frequency Impulse withstand
Circuit
Breaker type
kV rms kV rms kV peak
Amperes kA rms kA rms kV peak Amperes
36VCPW-ND25
36VCPW-ND32
3.6
3.6
10
10
40
40
630, 1250
630, 1250
25
31.5
25
31.5
63
79
25
25
72VCPW-ND25
72VCPW-ND32
7.2
7.2
20
20
60
60
630, 1250
630, 1250
25
31.5
25
31.5
63
79
25
25
36VCP-W25
36VCP-W32
36VCP-W40
3.6
3.6
3.6
10
10
10
40
40
40
630, 1250, 2000
1250, 2000
1250, 2000
25
31.5
40
25
31.5
40
63
79
100
25
25
25
72VCP-W25
72VCP-W32
72VCP-W40
7.2
7.2
7.2
20
20
20
60
60
60
630, 1250, 2000
1250, 2000
1250, 2000
25
31.5
40
25
31.5
40
63
79
100
25
25
25
120VCP-W25
120VCP-W32
120VCP-W40
12.0
12.0
12.0
28
28
28
75
75
75
630, 1250, 2000
1250, 2000
1250, 2000
25
31.5
40
25
31.5
40
63
79
100
25
25
25
175VCP-W25
175VCP-W32
175VCP-W40
17.5
17.5
17.5
38
38
38
95
95
95
1250, 2000
1250, 2000
1250, 2000
25
31.5
40
25
31.5
40
63
79
100
31.5
31.5
31.5
 Interrupting time is 3 cycles at 50/60 Hz. Rated operating sequence 0-3 min-
CO-3 min-CO.