Reference standard

IEC/IEEE

Voltage

72.5 kV

Withstand voltage

- Short-duration power-frequency, phase-to-earth / across isolating distance

140/160 kV

- Lightning impulse (BIL), phase-to-earth / across isolating distance

325/375 kVp

Frequency

50/60 Hz

Continuous current

630/1250/2000A

Short-time withstand current

25/31.5 kA

Peak withstand current

63/80 kAp 

Duration of short-circuit

3s

Internal Arc Class

IAC A (FLR) 31.5kA/0.5s

Installation

Indoor

Ambient temperature range

down to -30 / up to +40 °C

Circuit-breaker rating (Vacuum Interrupter)

Short-circuit breaking current

25/31.5 kA

Short-circuit making current

63/80 kAp 

Rated single capacitor bank breaking current

630A

Rated back to back capacitor bank breaking current

400A

Operating sequence

O-0.3s-CO-3 min-CO

Drive type (three-phase or single-phase)

Spring-operated mechanism

Mechanical endurance

M2 class

Capacitive switching

C2 class