Zw7-40.5 Outdoor Vacuum Circuit Breaker

The Usune Zw7-40.5 Outdoor Vacuum Circuit Breaker is an outdoor high-voltage vacuum circuit breaker suitable for 50Hz three-phase AC, 24-40.5kV power transmission and distribution systems, primarily used for system control, protection, sectionalizing, and capacitor bank switching. When used in conjunction with a recloser, it enables intelligent segmented reclosing control of the power system; it supports spring or electromagnetic operating mechanisms, has stable mechanical performance, and poses no risk of fire or explosion; it complies with GB1984-1989 "AC High Voltage Circuit Breakers" and IEC56, IEC62271-100 "High Voltage AC Circuit Breakers" standards.

Core Technical Features

1. Excellent Breaking Performance: Utilizes vacuum arc-extinguishing technology, resulting in strong breaking capacity, long electrical life, and a mechanical life of up to 10,000 cycles.
2. Maintenance-Free and Reliable: Simple structure, requiring no regular maintenance, and long service life.
3. Excellent Insulation and Anti-Pollution Performance: Strong outdoor insulation performance and outstanding anti-pollution capability.
4. Flexible Intelligent Configuration: Can be equipped with a built-in current transformer (accuracy up to 0.2S class) for metering and three-phase linkage protection.
5. Wide Compatibility of Operating Mechanisms: Adaptable to spring or electromagnetic operating mechanisms, enabling frequent and reliable operation.

Application Scope

1. 24-40.5kV transmission and distribution lines and substations
2. Urban and rural power grid renovation and expansion projects
3. Wind farms, solar power plants, and industrial power systems
4. Capacitor bank switching and tie circuit breaker applications
5. Coastal, high-altitude, and heavily polluted areas

Real-world Application Cases

1. Project Name: 35kV Wind Farm Grid Connection Project in Northern China

2. Client: State Grid Hebei Electric Power Co., Ltd.

3. Project Background: This wind farm is located in a coastal area with high humidity, heavy salt spray, and frequent thunderstorms. Its 35kV outgoing line system requires reliable circuit breakers for control, fault isolation, and automatic reclosing operations.

4. Solution: Uxin Electric provided 12 sets of Zw7-40.5 Outdoor Vacuum Circuit Breakers, equipped with spring-operated mechanisms and 0.2S-class built-in current transformers.

5. Application Achievements
- Stable operation for over 5 years in high humidity and high salt spray environments
- 100% success rate in 187 short-circuit breaking operations
- Intelligent reclosing function reduces power outage time by 85%
- Maintenance-free design reduces annual operation and maintenance costs by 60%

6. Customer Feedback

“The Usune Zw7-40.5 Outdoor Vacuum Circuit Breaker has demonstrated extremely reliable performance in our coastal wind farm. Its pollution prevention performance and intelligent protection functions have significantly improved grid stability.” – Project Manager, State Grid Hebei Electric Power Co., Ltd.

Main Technical Parameters

Outer Dimensions

Project Reference

Cas-space Rocket Launch Project

Test Report

FAQ

Q1: Which operating mechanisms can be used with the Zw7-40.5 Outdoor Vacuum Circuit Breaker?

A: Spring-operated or electromagnetic-operated mechanisms can be used. Spring-operated mechanisms offer high reliability and low maintenance costs, making them suitable for most outdoor applications.

Q2: Can the built-in current transformer be added later?

A: Yes. The current ratio and accuracy class (0.2S/0.5/10P10) must be specified when ordering.

Q3: What is the typical maintenance cycle?

A: Under normal use, the maintenance-free period is 10-15 years. A visual inspection is recommended every 2 years, and a minor mechanical inspection every 5 years.

Summary

The Usune Zw7-40.5 Outdoor Vacuum Circuit Breaker combines advanced vacuum technology, robust structural design, and intelligent features. As a trusted Chinese supplier, Usune Electric consistently ensures high-quality and high-performance products, making them an ideal choice for modern power systems that demand reliability, safety, and low life-cycle costs.