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	630	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

Structure of ZW32-12 High Voltage Vacuum Circuit Breaker

• Three-Phase Post Structure: Features a stable and reliable breaking performance with no risks of fire or explosion. Compact design, lightweight, maintenance-free, and long service life.
• Fully Sealed Construction: Ensures excellent moisture-proof and anti-condensation properties, ideal for cold and humid regions. Enhances operational reliability in challenging environments.
• High-Quality Insulation Materials: Uses outdoor epoxy resin or silicone rubber-wrapped epoxy resin for three-phase posts and current transformers. Provides resistance to extreme temperatures, UV radiation, and aging, ensuring durability.
• Miniaturized Spring Operating Mechanism: Low energy consumption and high efficiency with fewer components, reducing wear and enhancing reliability. Housed in a sealed box to prevent rusting and improve operational stability.
• Multiple Operation Options: Supports manual, electric, and remote-control operations. Compatible with smart controllers for automation and recloser controllers for sectionalizing and reclosing applications.
• Customizable Transformer Integration: Supports two-phase or three-phase current transformers for protection and signal collection. Metering current transformers can be added to meet specific user requirements.
• Integrated Three-Phase Isolating Switch: Provides visible disconnection in the open state for enhanced safety. Equipped with interlocks to prevent operation unless the switch is fully open or closed. Supports lightning arrester and post insulator integration for easier maintenance.

Installation Dimensions for ZW32-12

Figure 1, ZW32-12 External Dimension Diagram

1 Upper outlet 2 Vacuum arc extinction chamber 3 Insulation cylinder 4 Lower outlet 5 Conducting rod

6 Flexible connection 7 Insulation pull rod 8 Contact pressure device 9 Split spring 10 Drive connection plate

11 Mechanical output shaft 12 Operating mechanism 13 Mechanism box 14 Current transformer

Figure 2, ZW32-12G Vacuum Circuit Breaker External Dimension Diagram

1 Isolation operation handle 2 Isolation main shaft 3 Circuit breaker manual close-open handle 4 Circuit breaker energy storage handle 5 Divider indicator 6 Composite load controller external adjustment box

7 Circuit breaker junction box 8 Insulation cylinder 9 Insulation pull rod 10 Insulation bracket 11 Grounding terminal 12 Insulating part

13 Locking copper nut 14 Connection plate (outlet terminal) 15 Current transformer 16 Isolation blade 17 Connection plate (inlet terminal)

FAQs for ZW32-12 Vacuum Circuit Breaker

• What is the rated voltage and current of the ZW32-12 breaker?
  The breaker is designed for 12kV systems with a rated current of 630A.
• Can the ZW32-12 breaker be integrated into a smart grid?
  Yes, it supports smart grid integration with GPRS communication for remote control, monitoring, and adjustment.
• What is the short-circuit breaking capacity of this breaker?
  It supports breaking currents up to 20kA, with peak withstand currents of up to 50kA.
• What type of insulation materials are used?
  The breaker uses high-quality outdoor epoxy resin or silicone rubber for enhanced durability and UV resistance.
• How many operations can the ZW32-12 handle?
  The breaker is rated for 10,000 mechanical operations, making it suitable for frequent switching.
• What are the environmental operating conditions?
  It operates between -30°C and +50°C, with a maximum altitude of 3000m and relative humidity ≤95%.
• Is the breaker suitable for automation?
  Yes, it can integrate with automation systems, including recloser controllers for advanced grid management.

• تحليل المشاكل الشائعة لمحولات التيار في الأنظمة الكهربائية
• أعطال محولات التيار وتأثيرها على دقة قياس الطاقة
• نقاط التأريض المسموح بها في الدائرة الثانوية لمحولات الفولتية
• إدارة الأعطال في محولات الفولتية: التشخيص والحلول
• اعتبارات التعامل مع الأعطال في محولات التيار والفولتية
• آثار تشبع محولات التيار على حماية المحولات وحماية التيار