Siemens SENTRON 3WA1 - Minimum Cross-Sections of Main Conductors for AC

Technical specifications
6.3 Technical specifications of 3WA circuit breakers
3WA1 air circuit breaker
498 Equipment Manual, 02/2023, 92310000002-06
3WA12
AC
Endurance (operating cycles)
Breaking capacity S, M and H
Mechanical
Without maintenance
10000
10000
10000
10000
With maintenance
4)
20000
20000
20000
20000
Electrical
Without maintenance ≤ 690 V
7500
7500
4000
2000
With maintenance
4)
20000
20000
20000
20000
Breaking capacity C
5)
Mechanical
Without maintenance
5000
5000
5000
5000
With maintenance
4)
10000
10000
10000
10000
Electrical
Without maintenance ≤ 690 V
5000
5000
4000
1000
With maintenance
4)
10000
10000
10000
10000
Breaking capacity E
Mechanical
Without maintenance
10000
10000
10000
10000
With maintenance
4)
20000
20000
20000
20000
Electrical
Without maintenance ≤ 690 V
7500
7500
4000
2000
Without maintenance
≤ 1000 V
1000
1000
1000
1000
Without maintenance
≤ 1150 V
500
500
500
500
With maintenance
4)
20000
20000
20000
20000
4)
Maintenance means: Replace main contacts and arc chutes (see Chapter Inspection and maintenance
(Page 387))
5)
The main contact elements can only be replaced in the factory.
Switching frequency
6)
Breaking capacity S, M and H
Electrical
3-pole
45 / h
45 / h
45 / h
45 / h
4-pole
60 / h
60 / h
60 / h
60 / h
Breaking capacity E
Electrical
≤ 1150 V
3-pole
45 / h
45 / h
45 / h
45 / h
4-pole
60 / h
60 / h
60 / h
60 / h
Breaking capacity C
Electrical
3-pole
60 / h
60 / h
60 / h
--
4-pole
60 / h
60 / h
60 / h
--
6)
Minimum interval time between two operations
6.3.3.5 Minimum cross-sections of main conductors for AC
3WA12
AC
2000 A
2500 A
3200 A
4000 A
Minimum cross-sections of main conductors
Copper bars, bare or painted black
3 x 50 mm x
10 mm
2 x 100 mm x
10 mm
3 x 100 mm x
10 mm
4 x 120 mm x
10 mm