ZW8-12 Series Outdoor AC High Voltage Vacuum Circuit Breaker

Our ZW8-12 outdoor vacuum circuit breakers feature a three-phase common tank design with dry air insulation and an electric spring operating mechanism, delivering reliable performance in harsh environments.

• Rated at 12kV, 630A, with 20kA short-circuit breaking and 50kA making current.

• Vacuum interrupter with ceramic enclosure and cup-type axial magnetic field contacts ensures excellent breaking capability with ≥30 short-circuit operations.

• Mechanical life of 10,000 operations with contact wear allowance of 3mm for long-term reliability.

• Compact, lightweight design with silicone rubber molded outlet conductors for superior performance in polluted environments.

• Power frequency withstand voltage of 42/48kV and lightning impulse withstand of 75/85kV.

• Fast delivery, reliable quality, responsive service, and extensive project experience backed by our company.

Product Overview

This product utilizes a vacuum interrupter and air insulation, paired with an electric spring operating mechanism. This configuration provides strong arc-extinguishing capability, a high number of short-circuit interruptions, eliminates fire and explosion hazards, and ensures convenient operation, making it a high-performance and highly practical product.

The overall structure adopts a three-phase common tank design with bushing-type in/out terminals. The tank is filled with dry air. The electric spring operating mechanism is mounted on the side of the tank, enabling reliable operation even under harsh environmental conditions.

The vacuum interrupter features a ceramic enclosure, a cup-type axial magnetic field contact structure, and copper-chromium contact material, delivering excellent short-circuit current breaking and making capabilities.

The product is characterized by its compact size, light weight, and aesthetically pleasing appearance. The vacuum interrupter and insulating support bushings are designed for compactness. The outlet conductive rods are externally molded with silicone rubber, ensuring adaptability to severe climatic conditions and polluted environments.

Technical Specifications

S.Q.	Item	Parameter
1	Rated Voltage	12kV
2	Rated Current	630A
3	Power Frequency Withstand Voltage	42kV/48kV
4	Lightning Impulse Withstand Voltage (Peak)	75kV/85kV
5	Rated Short-Circuit Breaking Current (RMS)	20kA
6	Rated Short-Circuit Making Current (Peak)	50kA
7	Rated Operating Sequence	O - 0.3s - CO - 180s - CO
8	Rated Number of Short-Circuit Breaking Operations	≥30 times
9	Mechanical Life	10,000 times
10	Rated Control Voltage (Closing / Opening Coil)	DC220V AC220V
11	Permissible Wear Thickness of Moving and Fixed Contacts	3mm
12	Isolating Distance (Contact Gap)	>200mm

Model and Designation

Z W 8 - 12 / 630 - 20

Z: Vacuum

W: Outdoor

8: Design Serial Number

12: Rated Voltage (kV)

630: Rated Current (A)

20: Short-Circuit Breaking Current (kA)

Normal Service Conditions

1. Ambient Air Temperature: -40℃ to +40℃.

2. Altitude: Not exceeding 2000 m above sea level.

3. Ambient Air: May be subjected to pollution by dust, smoke, corrosive gases, vapor, or salt mist.

4. Wind Speed: Not exceeding 34 m/s (corresponding to 700 Pa pressure on a cylindrical surface).

5. Vibration or Seismic Activity: Vibration or earth motion from the switchgear and control equipment location is negligible.

6. Pollution Degree: Class III.

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