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TheZW8-12Vacuum Circuit Breaker guideis a high-performance outdoor switchgear designed for AC 50Hz, 10–12kV three-phase power systems. As a key component in modern power distribution networks, it provides reliable load switching, overload protection, and short-circuit interruption. Engineered to operate efficiently in harsh outdoor environments, thevacuum circuit breakeris ideal for applications in power utilities, rural substations, industrial grids, and smart distribution systems.
Compliant withIEC 62271-100, the ZW8-12 series supports modular enhancements such as disconnector integration, surge protection, automatic reclosers, and power electronics PT modules for intelligent automation and remote control.
Key Features of ZW8-12 Vacuum Circuit Breaker
- Vacuum Interruption Technology: Provides fast, arc-free switching for load and fault currents.
- Modular Upgrade Options: Compatible with surge arresters, isolators, reclosers, automation metering, and dual power switching devices.
- Wide Operating Range: Can operate in extreme outdoor temperatures, up to 2000 meters altitude, with high wind and seismic resistance.
- Intelligent Variants: Versions like ZW8-12/C, ZW8-12/PT, and ZW8-12/ePT offer smart fault detection, recloser functionality, and energy-autonomous operation.
- Long Service Life: Rated for 10,000 mechanical operations and 50 short-circuit breaking cycles.
Application Scenarios
TheZW8-12 Vacuum Circuit Breakeris used across various utility and industrial sectors:
- Rural and urban medium-voltage distribution networks
- Pole-mounted outdoor breaker stations
- Renewable energy and small hydropower grid connections
- Smart grid automation and fault isolation
- Substations and ring main units requiring recloser functionality
Technical Parameters of ZW8-12 Vacuum Circuit Breaker
| Item | Unit | Parameter |
|---|---|---|
| Rated Voltage | kV | 12 |
| Power Frequency Withstand Voltage (1 min) | kV | 42 |
| Lightning Impulse Withstand Voltage (Peak) | kV | 75 |
| Rated Frequency | Hz | 50 / 60 |
| Rated Current | A | 630 / 1250 |
| Rated Short-Circuit Breaking Current | kA | 20 |
| Rated Short-Time Withstand Current (RMS) | kA | 20 |
| Rated Peak Withstand Current | kA | 50 |
| Rated Short-Circuit Closing Current | kA | 50 |
| Capacitor Bank Breaking Current (Single/Back-to-Back) | A | 630 / 400 |
| Short-Circuit Duration | s | 4 |
| Short-Circuit Breaking Times | Times | 50 |
| Main Circuit Resistance | μΩ | ≤120 (≤200 with isolator) |
| Operating Voltage | V DC | 220 |
| Mechanical Life | Times | 10,000 |
| Overcurrent Setting Range | A | 1–10 |
| Quick-Break Current Range | A | 6–20 |
| Delay Time Range | ms | 40–850 |
| Remote Control Distance | m | >30 |
| Reclose Times | Times | 0–3 |
| Operating Sequence | – | O-0.3s-CO-180s-CO |
ZW8-12 Product Variants
ZW8-12/T Type
The standard model with a spring operating mechanism. It can be combined with isolators and lightning arresters. The silicon rubber jacket provides weather resistance and anti-corrosion. Ideal for grid protection in challenging environments.
ZW8-12/C Type
Intelligent recloser type, equipped with a controller for automatic power recovery after transient faults. Supports single or multiple reclosing operations, inrush current control, and short-circuit fast breaking. Suitable for radial or ring power systems.
ZW8-12/PT Type
Includes a voltage transformer drawing power from the high-voltage line, supplying 220V/110V/100V for the breaker or other devices. Perfect for small hydro stations and rural substations with autonomous operation.
ZW8-12/ePT Type
Equipped with electronic PT and battery charging via CTs. Supports operation during power loss, integrates inrush control, overcurrent, and short-circuit protection. Allows wired or wireless remote control and is ideal for smart grid deployments.
TheZW8-12 Vacuum Circuitbreaker guideoffers a robust, modular, and intelligent solution for outdoor medium-voltage power protection. With multiple variants and upgrade options, it meets the needs of modern power distribution systems requiring fast fault clearing, automation, and long-term durability. Whether used in basic overload protection or full-featured smart grid applications, thisvacuum circuit breakerensures safety, reliability, and operational flexibility in all weather and load conditions.
