Overview of ZW32-12 vacuum circuit breaker

The ZW32-12(G) outdoor pole-mounted high-voltage vacuum circuit breaker is specifically designed for 12kV power systems operating at a standard frequency of 50Hz. Engineered for urban and rural power distribution networks, it effectively manages load currents, overload currents, and short-circuit currents with exceptional reliability and performance.

Key features of the ZW32-12(G) include a built-in isolating switch, providing a visible isolation gap to enhance operational safety and ensure ease of maintenance. This three-phase outdoor switchgear is tailored for high-performance applications in modern power grids, delivering robust functionality and long-term stability in various environments.

This ZW32-12 vacuum circuit breaker is the perfect choice for modern power grids, offering energy efficiency, safety, and long-term durability in critical power applications.

Type designation of ZW32-12 Vacuum Circuit Breaker

The ZW32-12(G)/630-20 Outdoor Pole-Mounted High-Voltage Vacuum Circuit Breaker type designation is as follows:

• Z: Vacuum Circuit Breaker
• W: Outdoor Application
• 32: Design Sequence
• 12: Rated Voltage (kV)
• G: With Isolating Switch
• 630: Rated Current (A)
• 20: Rated Short-Circuit Breaking Current (kA)

Operating Conditions for ZW32-12 Vacuum Circuit Breaker

• Ambient Temperature: Maximum +50°C, Minimum -30°C
• Altitude: ≤3000m (For higher altitudes, the rated insulation level should be increased accordingly)
• Vibration: Ground-level vibration not exceeding 8° intensity
• Relative Humidity: Daily average ≤95%, Monthly average ≤90%
• Environment: Free from fire hazards, explosive risks, severe pollution, corrosive chemicals, and intense vibration or impacts

These operating conditions ensure the device’s optimal performance and long-term reliability in various environments.

Technical Parameters of ZW32-12 Vacuum Circuit Breaker

Item			Unit	ZW32–12(G) /400–12.5	ZW32–12(G) /630–16	ZW32–12(G) /630–20
Rated Voltage			kV	12
Rated Current			A	400	630	630
Rated Short-Circuit Breaking Current			kA	12.5	16	20
Rated Short-Circuit Making Current (Peak)			kA	31.5	40	50
Rated Peak Withstand Current			kA	31.5	40	50
Rated Short-Time Withstand Current			kA	12.5	16	20
Rated Short-Time Duration			S
Rated Insulation Level	Lightning Impulse Withstand Voltage (Peak)		kV	Between Phases and Earth: 75, Across Break: 85
	1min Power Frequency Withstand Voltage		kV	Between Phases and Earth: 42, Across Break: 48
Rated Operating Sequence				Open–0.3s–Close Open–180s –Close Open (electric mechanism)
Rated Short-Circuit Current Breaking Times			Times	30
Mechanical Life			Times	10000
Operating Voltage (Close/Trip Coil)			V	DC220, 110, AC220
Allowed Cumulative Wear of Contacts			mm	3
Overcurrent Release Rated Current			A	5
Current Transformer Ratio			A	200/5, 400/5, 600/5
Contact Distance			mm	9 ± 1
Overtravel (Contact Spring Compression Length)			mm	2 ± 0.5
Average Opening Speed			m/s	1.2 ± 0.3
Average Closing Speed			m/s	0.6 ± 0.2
Opening Time			ms	30–60
Closing Time			ms	20–40
Closing Bounce Time			ms	≤2
Three-Phase Closing/Opening Synchronism			ms	≤2
Resistance of Each Phase Main Circuit			μΩ	≤80
Energy Storage Motor		Rated Voltage	V	-220
		Rated Power	W	200
		Energy Storage Time	S	≤8
Weight			Kg	85,125 (with G)

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 and supports rated currents of 400A or 630A.
• Can the ZW32-12 breaker be operated remotely?
  Yes, it supports remote control operations and is compatible with smart grid controllers.
• 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.

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