3AH37 and 3AH38 – reliable switching capacity for up to 72 kA and 6300 A operating current
In numerous power stations around the world, the 3AH38 high-current and generator circuit-breaker has become the standard for switching rated operating currents up to 4000 A. The 3AH38 is the first 63 kA and 72 kA vacuum circuit-breaker in the world that has been type-tested in accordance with the criteria of the generator circuit-breaker guideline IEEE Std C37.013. With the 3AH37, Siemens is offering the first internationally available vacuum circuit-breaker for higher generator power capacities which can carry an operating current of 6300 A on a sustained basis up to 24 kV without forced-air cooling. In addition at 24 kV, it can handle short-circuit currents up to 72 kA. With forced-air cooling the 3AH37 can carry an operating current up to 8000 A.
In numerous power stations around the world, the 3AH38 high-current and generator circuit-breaker has become the standard for switching rated operating currents up to 4000 A. The 3AH38 is the first 63 kA and 72 kA vacuum circuit-breaker in the world that has been type-tested in accordance with the criteria of the generator circuit-breaker guideline IEEE Std C37.013. With the 3AH37, Siemens is offering the first internationally available vacuum circuit-breaker for higher generator power capacities which can carry an operating current of 6300 A on a sustained basis up to 24 kV without forced-air cooling. In addition at 24 kV, it can handle short-circuit currents up to 72 kA. With forced-air cooling the 3AH37 can carry an operating current up to 8000 A.
Modular high current and generator circuit-breakers from Siemens offer concrete benefits in everyday operation:
- High mechanical stability through the column construction
- Compact dimensions through vertical arrangement of the vacuum interrupters
- Low fire load as solid insulation is not required
- No forced cooling required because of free convection
- Secondary equipment can be easily retrofitted
- Maintenance-free throughout its entire service life
- Suitable for horizontal and vertical installation
- Type-tested according to IEEE Std C37.013-1997
Reference : siemens (siemens\power distribution\Medium Voltage Indoor Devices\Indoor Vacuum Circuit Breaker)
Downloads
Vacuum Circuit-Breaker 3AH37/38