40.5KV Substation Circuit Breaker With Current Transformer

The ZW7-40.5 40.5KV Substation Circuit Breaker With Current Transformer is a high-voltage outdoor vacuum circuit breaker designed for substations, power plants, industrial facilities, and urban or rural power distribution networks. It combines a high-performance vacuum interrupter with integrated current transformers to provide reliable switching, protection, measurement, and control functions for medium- and high-voltage electrical systems.

The circuit breaker features an upper porcelain insulator housing the vacuum interrupter and a lower porcelain support insulator that ensures excellent mechanical strength and insulation performance. The external current transformers enable accurate current monitoring and protection coordination while simplifying installation and maintenance operations.

Designed for long-term outdoor service, this 40.5KV vacuum circuit breaker offers excellent sealing performance, strong resistance to aging, superior dielectric strength, and outstanding environmental adaptability. Its vacuum interruption technology eliminates fire and explosion risks while providing a long electrical and mechanical service life.

Available in 33KV, 35KV, and 40.5KV voltage ratings, the ZW7 series is widely used for load current switching, overload protection, short-circuit interruption, and system isolation in transmission and distribution networks.

Product Appearance Diagram

Dimension Drawing

Technical Parameters

Product Features

• Advanced vacuum interruption technology ensures reliable arc extinction and fault isolation.
• Integrated current transformers provide accurate measurement, monitoring, and protection functions.
• Suitable for 33KV, 35KV, and 40.5KV medium-voltage and high-voltage distribution systems.
• High-strength porcelain insulators offer excellent insulation performance and mechanical stability.
• Sealed vacuum interrupter design delivers long service life and minimal maintenance requirements.
• Excellent resistance to aging, humidity, pollution, and harsh outdoor environments.
• Supports both manual and motorized operation for flexible system integration.
• Independent current transformer structure simplifies inspection, calibration, replacement, and maintenance.
• High short-circuit breaking capacity up to 31.5KA ensures reliable power system protection.
• No oil, no explosion risk, and environmentally friendly operation.

Applications

The 40.5KV Substation Circuit Breaker With Current Transformer are widely used in medium-voltage and high-voltage power systems requiring reliable switching, protection, and control functions.

• Electrical substations
• Power transmission and distribution networks
• Utility grid projects
• Hydroelectric power stations
• Thermal power plants
• Wind power generation systems
• Solar energy projects
• Mining and metallurgical facilities
• Industrial manufacturing plants
• Railway and transportation power supply systems
• Urban and rural electrical distribution networks

Technical Advantages

Compared with traditional oil circuit breakers and SF6 circuit breakers, the ZW7-40.5 Outdoor Vacuum Circuit Breaker offers superior operational reliability, reduced maintenance requirements, and longer service life. The vacuum interrupter effectively extinguishes arcs within a sealed vacuum chamber, minimizing contact erosion and improving switching performance.

The integrated current transformer design supports accurate relay protection, fault monitoring, current measurement, and system automation, making it an ideal solution for modern smart grid and power distribution applications.

With excellent dielectric strength, high mechanical endurance, and stable operation under demanding environmental conditions, the 40.5KV Vacuum Circuit Breaker is a preferred choice for utility companies, EPC contractors, and electrical infrastructure projects worldwide.

Frequently Asked Questions

What is a 40.5KV vacuum circuit breaker used for?

A 40.5KV vacuum circuit breaker is used to protect and control medium-voltage and high-voltage power systems by interrupting load currents, overload currents, and short-circuit fault currents in substations and electrical distribution networks.

Why is a current transformer integrated with the circuit breaker?

The integrated current transformer provides accurate current measurement, protection relay input, fault monitoring, and automation control functions, improving overall system safety and operational efficiency.

What are the advantages of vacuum circuit breakers?

Vacuum circuit breakers provide fast arc extinction, long service life, low maintenance requirements, high reliability, environmental friendliness, and superior electrical performance compared with conventional technologies.

Can the ZW7-40.5 circuit breaker be installed outdoors?

Yes. The ZW7-40.5 Outdoor Vacuum Circuit Breaker is specifically designed for outdoor installation and can withstand various environmental conditions including temperature fluctuations, humidity, and pollution.

Which industries commonly use 40.5KV substation circuit breakers?

These circuit breakers are widely used in utilities, substations, power generation plants, renewable energy projects, mining operations, industrial facilities, transportation infrastructure, and large-scale electrical distribution systems.