The ZW32M-12 outdoor high-voltage permanent magnet vacuum circuit breaker is an outdoor distribution device rated for 12 kV, three-phase AC 50 Hz. It is primarily used to interrupt and close load currents, overload currents, and short-circuit currents in power systems. Suitable for protection and control applications in urban and rural power grids, it is especially ideal for locations requiring frequent operations. The breaker employs an advanced and reliable single-stable permanent magnet operating mechanism, where the closing position is maintained by a magnetic field generated by rare-earth permanent magnets. This eliminates traditional mechanical components such as energy storage and latching mechanisms, which are prone to wear, simplifying the overall structure. The number of parts is reduced by over 70% compared to conventional mechanisms, not only facilitating assembly but also significantly enhancing reliability and service life. Additionally, by using capacitors as the operating current source, the impact of auxiliary power fluctuations on the mechanism's performance is avoided. The high-performance permanent magnet operating mechanism enables long-term frequent operation with a service life of up to 30,000 operations, achieving true permanent maintenance-free operation.
Main Parameters:
• Rated voltage: 12 kV, 50 Hz
• Rated current: 630 A
• Rated short-circuit breaking current: 20 kA (4 s thermal stability); closing peak current 50 kA
• Insulation level: Power frequency withstand voltage 42 kV (to ground/phase-to-phase), 48 kV (contact gap)/1 min; lightning impulse withstand voltage 75 kV (to ground), 85 kV (contact gap)
• Mechanical life: 30,000 operations (spring-operated mechanisms approximately 10,000 operations)
• Short-circuit breaking capacity: 30 operations
• Protection rating: IP65 (outdoor waterproof and dustproof)
• Operating environment: -40°C to +40°C, altitude ≤ 1000 m
Structure:
1. Encapsulated pole: Vacuum interrupter chamber with epoxy resin cast composite insulation, silicone rubber external insulation, pollution-resistant and weatherproof
2. Permanent magnet operating mechanism (single-stable rare-earth permanent magnet): Permanent magnets hold open/close positions; no complex energy storage or latching components (70% fewer parts than spring mechanisms); capacitor energy storage operation; reliable operation, maintenance-free, suitable for frequent operations
3. Accessories: Intelligent permanent magnet controller (FTU), optional integrated electronic/ electromagnetic current and voltage transformers (CT/PT), optional disconnector switch, manual trip function, stainless steel enclosure
