Overview Outdoor High Voltage Vacuum Circuit Breaker

The ZW8-12(G) outdoor vacuum circuit breaker is designed for 12kV, three-phase AC power systems operating at 50Hz. It is primarily used for controlling and protecting load currents, overload currents, and short-circuit currents in rural networks, city grids, and small-scale power systems.

This product features an integrated structure where the three-phase vacuum interrupters are housed in a metal box. The use of SMC insulating materials ensures reliable performance and high insulation strength for phase-to-phase and ground insulation.

The ZW8-12G model integrates an isolating switch with the circuit breaker, functioning as a sectionalizer. It offers both manual and electric control options with the CT23 spring-operated mechanism.

The breaker includes integrated closing and opening current control functions, meeting advanced control and monitoring requirements. It can also be paired with a remote control unit, enabling “remote control, remote measurement, remote communication, and remote adjustment,” making it ideal for smart grid applications.

Type Designation for ZW8 Vacuum Circuit Breaker

• Z: Vacuum circuit breaker
• W: Outdoor type
• 8: Design sequence
• 12: Rated voltage (kV)
• G: With isolating switch
• /630: Rated current (A)
• -□: Rated short-circuit breaking current (kA)

Product Features

1. Three-Phase Dry-Type Design: The overall structure is a three-phase pillar configuration, providing reliable and efficient performance.
2. Enclosed and Sealed Construction: Designed with excellent sealing to resist moisture and condensation, making it ideal for operation in hot and humid environments.
3. Vacuum Interruption: Features reliable insulation and efficient arc extinguishing for enhanced safety and performance.
4. Permanent Magnetic Mechanism: Compact and lightweight design with a simple structure and fewer moving parts, ensuring high reliability and maintenance-free operation.
5. Flexible Configuration: The switch body and controller can be tailored to meet various application needs, enabling customized protection solutions.
6. Multiple Control Methods: Supports versatile control options, including manual, electric, infrared, and remote control operations. Additionally, GPRS wireless communication is available for remote monitoring and operation.
7. Built-in PT: The device includes a built-in Potential Transformer (PT) with fuses for each phase, ensuring easy installation, operational safety, and reliability.
8. Zero-Sequence Current Transformer: Equipped with a built-in zero-sequence current transformer for ground fault protection and alarm functionalities.
9. Safe and Reliable Operation: The circuit breaker’s breaking and switching capabilities are dependable, with no risk of combustion or explosion, ensuring long-term operational safety.
10. Durability and Corrosion Protection: The operating mechanism is sealed at the base of the switch box, effectively preventing corrosion caused by prolonged outdoor exposure, ensuring a long service life.

Operating Conditions for ZW8 Vacuum Circuit Breaker

1. Temperature: -40℃ to +40℃.
2. Altitude: ≤3000m (higher altitudes require adjusted insulation).
3. Pollution: Suitable for Grade V environments (dust, smoke, salt mist, etc.).
4. Wind Speed: ≤34m/s (700Pa pressure).
5. Vibration: External vibrations and seismic effects negligible.
6. Custom Conditions: For non-standard applications, consult us for tailored solutions.

Technical Parameters of ZW8 Vacuum Circuit Breaker

Item			Unit	ZW8-12(G) /630-6.3kA	ZW8-12.5kA /630-12.5kA	ZW8-12(G) /630-20kA
Rated Voltage			kV	12
Rated Current			A	630
Rated Short-Circuit Breaking Current			kA	6.3	12.5	20
Rated Short-Circuit Making Current (Peak)			kA	16	31.5	50
Rated Peak Withstand Current			kA	16	31.5	50
Rated Short-Time Withstand Current			kA	6.3	12.5	20
Rated Insulation Level	Lightning Impulse Withstand Voltage (Peak)		kV	75
	1min Power Frequency Withstand Voltage		kV	42
Rated Operating Sequence				Open–0.3s–Close- Open–180s–Close Open
Mechanical Life			Operations	10000
Rated Short-Circuit Breaking Current Breaking Times			Times	30
Closing Voltage of Operating Mechanism			V	110, 220
Opening Voltage of Operating Mechanism			V	110, 220
Contact Distance			mm	11 ± 1
Overtravel (Contact Spring Compression Length)			mm	3 ± 0.3
Phase Discrepancy of Closing and Opening			ms	≤2
Contact Closing Bounce Time			ms	≤2
Average Closing Speed			m/s	1.0 ± 0.2
Average Opening Speed			m/s	0.7 ± 0.15
Opening Time	At Maximum Operating Voltage	ms	15–50
	At Minimum Operating Voltage		30–60
Closing Time			ms	25–50
Resistance of Each Phase Main Circuit			μΩ	≤120 (with G ≤ 200)
Permitted Cumulative Thickness of Contact Wear			mm	3
Weight			kg	152 (with G180)
Phase Center Distance			mm	175 ± 1.5

Installation Dimensions for ZW8

ZW8-12(G) outdoor vacuum circuit breaker Installation Dimensions

Main Components 

1.Contact Blade  2. Contact Base  3. Contact Blade Support  4.Insulated Pull Rod  5.Operating Handle 6.Isolation Switch Support  7.Circuit Breaker

Note

This detailed product description provides comprehensive information about the ZW8-12(G) Outdoor High Voltage Vacuum Circuit Breaker, including its features, specifications, and applications. For specific customization needs such as unique configurations, non-standard operating conditions, or enhanced functionalities, please feel free to contact our technical team. We are ready to provide tailored solutions to meet your precise requirements.

FAQs for ZW8-12(G) Vacuum Circuit Breaker

1. What is the rated voltage and current of the ZW8-12(G) breaker?
   The breaker is designed for 12kV systems with a rated current of 630A.
2. Can the ZW8-12(G) breaker be integrated into a smart grid?
   Yes, it supports smart grid integration with GPRS communication for remote control, monitoring, and adjustment.
3. What are the environmental conditions suitable for this breaker?
   It operates in temperatures ranging from -40°C to +40°C, at altitudes up to 3000m, and in pollution zones up to Grade V.
4. Does the breaker include fault detection features?
   Yes, it is equipped with a zero-sequence current transformer for ground fault detection and protection.
5. What is the mechanical life of the ZW8-12(G)?
   The breaker is rated for 10,000 mechanical operations, ensuring long-term durability.
6. Is the breaker suitable for remote monitoring and control?
   Yes, it supports remote monitoring and control through GPRS modules and automation systems, making it ideal for modern power distribution networks.

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