Vacuum circuit breaker ZW39

spring operatedACHV

Product Overview
ZW39 Vacuum Circuit Breaker is an outdoor high-voltage AC switching device designed for power transmission and distribution. It integrates vacuum interrupters with a fluorine-free insulating medium (GWP = 0), configurable internal or external CT, and an integrated die-cast aluminium base spring operating mechanism for reliable, maintenance-free operation in harsh environments including -50°C, high altitude, condensation and ice. Suitable for substations, distribution networks and railway traction substations.

Key Features

• Eco-friendly insulating medium — Vacuum interrupter units using nitrogen/clean air; fluorine-free solution, GWP = 0.
• Wide environmental tolerance — Eliminates low-temperature liquefaction risk; sealed design with no exposed mechanical transmission components; reliable operation at -50°C, high altitude, and in condensation/ice conditions.
• Robust mechanism — Integrated die-cast aluminium base spring mechanism providing stable output performance, M2 mechanical life class compliance and maintenance-free operation.
• High breaking capability — Full product series delivers breaking capacity up to 40 kA and peak making/withstand performance up to 104 kA, suitable for complex fault conditions.
• Configurable — Internal or external CT, optional motorized drive and remote control interfaces.

Technical Specifications

• Rated voltage (kV): 31.5, 40.5, 72.5, 145
• Rated frequency (Hz): 50/60
• First-pole-to-clear factor: 1.3/1.5
• Rated current (A): Up to 3150
• Rated short-circuit breaking current (kA): Up to 40
• Rated short-circuit making current (peak) (kA): Up to 104
• Rated short-time withstand current (kA): Up to 40
• Rated peak withstand current (kA): Up to 104
• Rated short-time withstand duration (s): 4
• Rated operating sequence: O-0.3s-CO-3min-CO
• Mechanical endurance: 10000 operations

Applications

• High-voltage substations, distribution networks, railway traction substations, industrial power systems and renewable integration points.

Options & Accessories

• Internal/external CT, motorized or manual operation, remote control modules, multiple drive configurations and site-specific adaptations.