Parameters Parameter Value / Typical Specification Product Family ABB VD4 Medium‑Voltage Vacuum Circuit Breaker Model Designation VD4 12.12.32 (M variant) Rated System Voltage (Ur) ~12 kV (medium‑voltage class) Rated Normal Current (In) ~1250 A (typical for the 12.12.32 configuration) Rated Short‑Circuit Breaking Current 31.5 kA (symmetrical) Impulse Withstand Voltage (Up) ~75 kV (lightning impulse) Power Frequency Withstand (Ud) ~28 kV rms Frequency 50/60 Hz Poles 3 (three phases) Vacuum Interrupter Technology Integrated interrupters inside resin‑embedded poles Operating Mechanism Stored‑energy spring mechanism with manual or motorized charging Operating Sequence Typically 0‑0.3s‑CO‑15s‑CO (standard switchgear sequence) Mechanical Life Very high (tens of thousands of operations) Mounting Option Fixed or withdrawable for medium‑voltage switchgear Protection & Standards IEC 62271‑100 compliance for medium‑voltage breakers Typical Use Cases Switchgear feeder protection, transformer protection, motor feeder circuits Accessories Shunt releases, undervoltage releases, auxiliary contacts, interlocks Environmental Designed for industrial and utility electrical environments Weight ~90–120 kg (system variation)