ABB HD4/Z 17.16.40

The HD4/Z 17.16.40 is an SF6 withdrawable medium voltage circuit breaker from ABB HD4 series, rated at 17.5kV, 1600A and 40kA short-circuit breaking capacity. This HD4/Z 17.16.40 is designed for installation inside UniGear ZS switchgear cabinets, adopting SF6 gas as arc quenching and insulating medium for reliable circuit switching. The HD4/Z 17.16.40 is equipped with spring energy storage mechanism, which supports local manual operation and remote electrical closing and tripping for power distribution control.

This HD4/Z 17.16.40 integrates gas density monitoring function to track internal SF6 gas status and trigger alarm when gas leakage occurs. The HD4/Z 17.16.40 delivers stable performance for transformer, capacitor bank, motor and feeder protection in power plants, industrial substations and public grid stations. Maintenance teams select this HD4/Z 17.16.40 as direct replacement spare unit for existing UniGear switchgear overhaul and emergency fault repair.

The HD4/Z 17.16.40 follows IEC standard for medium voltage switchgear, with compact withdrawable structure to simplify testing and replacement without power cut on the whole cabinet. The HD4/Z 17.16.40 features low chopping current and less switching overvoltage, which is friendly to sensitive electrical loads. Many factories and power stations stock the HD4/Z 17.16.40 for lifecycle maintenance of legacy HD4 switchgear systems.