The ZN73-12 series indoor three-phase AC high-voltage vacuum circuit breaker by People Electric is a core switching protection device adapted to 12kV, 50Hz three-phase AC power systems. Tailored for industrial and mining enterprises, power plants, substations and other scenarios, it serves as an indispensable key device in industrial power distribution systems, with core advantages and adaptability reflected in four aspects:
1.Precise Scenario Adaptation & Core Positioning: It enables switching of various loads and protection & control of electrical facilities, especially suitable for industrial power scenarios requiring frequent operations, providing targeted power protection and control solutions for high-voltage distribution scenarios of different scales.
2.Excellent Arc Extinguishing Performance & Structural Design: Adopting vacuum as the arc-extinguishing and insulating medium and copper-chromium contact material, it features low electrical wear, high voltage resistance and rapid recovery of post-arc insulation strength to cut off fault currents quickly and stably. It adopts an integrated layout with the operating mechanism and arc-extinguishing chamber arranged front and rear, and a three-phase floor-type main conductive circuit. The arc-extinguishing chamber is installed in a cylinder cast with epoxy resin via APG technology, delivering strong creepage resistance and low dust accumulation. Meanwhile, it reduces intermediate transmission links to lower energy consumption and noise with reliable operating performance.
3.Flexible Structural Configuration & Comprehensive Protection: Available in fixed type and draw-out type, it can be installed in fixed and withdrawable switch cabinets respectively to meet diverse installation and operation & maintenance requirements. Equipped with complete electrical protection components including anti-trip relay, over-current tripping electromagnet and energy storage micro-switch, it greatly improves operation safety. It stably operates at -10℃ to +40℃, withstands earthquakes up to magnitude 8, and works reliably in environments without corrosive/flammable gases or severe vibration. Customized services are provided for special working conditions.
4.Diversified Model Selection & Low Operation & Maintenance Cost: Rated current ranges from 630A to 3150A, and rated short-circuit breaking current covers 20kA to 40kA, allowing flexible selection based on actual on-site load current. With long mechanical service life, simple maintenance, zero pollution and no explosion risk, it effectively reduces operation and maintenance costs for industrial users.
Key Product Highlights
1.Product Attribute: Indoor three-phase AC high-voltage vacuum circuit breaker adapted to 12kV/50Hz power systems, complying with national standards. Vacuum arc-extinguishing medium ensures superior arc extinguishing and insulation performance.
2.Core Advantages: Copper-chromium contacts with low wear and long service life; integrated structure with low energy consumption, creepage resistance and pollution resistance; 10,000-time mechanical service life, fast opening/closing response and strong fault breaking capacity; complete protection components for high operation safety.
3.Application Scenarios: Protection and control of electrical facilities in industrial and mining enterprises, power plants, substations, especially suitable for load switching with frequent operations.
4.Structure & Customization: Fixed and draw-out structures adaptable to various switch cabinets; customized production available for special working conditions with strong environmental adaptability.
⭕️Core Technical Parameters of ZN73-12 Series High-Voltage Vacuum Circuit Breaker
| Category | Item | Unit | Core Parameter |
| Basic Technical Parameters | Rated Voltage | kV | 12 |
| Rated Frequency | Hz | 50 | |
| 1min Power Frequency Withstand Voltage (Phase-to-Phase/Phase-to-Ground/Break Contact) | kV | 42/48 (RMS) | |
| Lightning Impulse Withstand Voltage (Phase-to-Phase/Phase-to-Ground/Break Contact) | kV | 75/85 (Peak) | |
| Main Circuit Resistance | mΩ | ≤50 | |
| Mechanical Operating Cycles | Times | 10,000 | |
| Rated Short-Circuit Duration | s | 4 | |
| Key Mechanical Characteristics | Three-Phase Opening/Closing Synchronization | ms | ≤2 |
| Opening Time | ms | ≤50 | |
| Closing Time | ms | ≤100 | |
| Contact Gap | mm | 11±1 | |
| Allowable Cumulative Wear of Moving/Static Contacts | mm | 3 | |
| Operating Power Parameters | Rated Voltage | AC/DC | 220V/110V |
| Opening/Closing Rated Power | W | 264/264 | |
| Energy Storage Time | s | ≤10 | |
| Main Model Matching | ZN73-12/630-20 | Rated Current/Breaking Current (A/kA) | 630/20/25 |
| ZN73-12/1250-31.5 | Rated Current/Breaking Current (A/kA) | 1250/31.5 | |
| ZN73-12/2000-40 | Rated Current/Breaking Current (A/kA) | 2000/40 | |
| ZN73-12/3150-40 | Rated Current/Breaking Current (A/kA) | 3150/40 |
With mature technology, stable performance and multi-scenario adaptability, the ZN73-12 series high-voltage vacuum circuit breaker is the preferred device for power protection and control in industrial power systems. Its advantages in arc extinguishing capacity, structural design and environmental adaptability effectively ensure the safe and efficient operation of industrial power distribution systems, laying a solid foundation for stable power supply in industrial and mining enterprises, power plants, substations and other scenarios.
Post time: Mar-21-2026
