Disconnecting Circuit Breakers (DCB)

Siemens Energy has developed a device in which the isolating distance has been integrated in the SF6 gas compartment in order to reduce external environmental influences. The DCB (Disconnecting Circuit Breaker) is used as a circuit breaker and also as a disconnector – two functions combined in one device. An additional air-insulated earthing switch can be mounted onto the supporting structure for voltages up to 145 kV.

Rated voltage [kV]145420
Number of interrupter units per pole
Rated power-frequency withstand voltage [kV]
275 or 315
520 or 610
Rated lightning impulse withstand voltage / min [kV]
650 or 750
1425 or 1665
Rated switching impulse withstand voltage [kV]
 1050 or 1245
Rated normal current, up to [A]
Rated short-time withstand current (1s - 3s), up to [kA (rms)]
Temperature range [°C]
-40 up to +40
Rated operating sequence
0-0.3 s-CO-3 min-CO or CO-15 s-CO
Rated break time
3 cycles
Rated frequency [Hz]
50 or 60
Maintenance after
25 years
Insulating medium

All values in accordance with IEC; other values on request

Our services for you

You can find details on our Dead Tank Compact circuit breakers and information about our services here.

Brochure High-Voltage Circuit Breakers
PDF (17 MB)
Certificate: REACH declaration circuit breakers
PDF (77 KB)

We can gladly help you with installation, commissioning, diagnostics and malfunctions