110kv 126kv Disconnect Switch Isolator

Zhejiang Usune Electric Co., Ltd. is a professional high-voltage electrical enterprise dedicated to the design, research and development, factory production, and global sales of 12kV to 245kV indoor and outdoor high-voltage equipment. Its core products include vacuum circuit breakers, SF6 circuit breakers, disconnect switches, load switches, and the GW4 series 110kv 126kv Disconnect Switch Isolator. The company leverages advanced production equipment, rigorous testing processes, standardized material selection, exquisite craftsmanship, and a comprehensive quality management system to lay a solid foundation for product quality.

Product Overview

The Usune GW4 series outdoor high-voltage disconnect switch is a core piece of equipment in 110kV and 126kV power systems. It is primarily used for circuit switching under no-load conditions, providing visible isolation clearance for equipment maintenance and ensuring operator safety. The electrical and mechanical performance of the 110kv 126kv Disconnect Switch Isolator is fully compliant with national standards GB1985 "AC High-Voltage Disconnect Switches and Grounding Switches," DL486 "AC High-Voltage Disconnect Switch Ordering Technical Conditions," and IEC international standards.

Structural Features:

1. Structure Type: Double-column single-pole structure; the three poles are mechanically connected via a shaft for synchronous operation.
2. Core Components: Composed of a robust base, high-insulation porcelain pillars, and a precision conductive system.
3. Operating Mechanism: Each pole contains two ceramic pillars mounted on bearings. The conductive switch is divided into two halves, which rotate horizontally 91° via a cross-linking mechanism to achieve synchronous opening and closing in the same direction.
4. Contact Point: Located between the two ceramic pillars, ensuring stable contact and extremely low resistance.

Technical Advantages:

1. Compliant and Reliable: Fully compliant with national and IEC standards, offering stable performance and a long service life.
2. Excellent Insulation: High-quality ceramic pillars provide high insulation strength and excellent anti-pollution and anti-flashover performance.
3. Smooth Operation: Precision linkage mechanism ensures flexible and smooth operation with minimal mechanical wear.
4. Convenient Installation and Maintenance: Compact and reasonable structure, easy on-site installation, and minimal maintenance.
5. Strong Environmental Adaptability: Suitable for various outdoor climates, including high-altitude, polluted, and coastal areas.

Real-world Application Case

1. Project Name: East China 110kV Urban Substation Upgrade Project
2. Location: Zhejiang Province, China
3. Time: 2024-2025
4. Details: Usune provided 36 GW4-126kV disconnect switches for this key urban power grid upgrade project to improve the power supply reliability of a 20 square kilometer commercial and residential area.
5. Operating Performance: Installation and commissioning were successfully completed within 45 days. Stable operation was achieved under peak summer load (1.2 times rated current) in 2025, with no overheating or poor contact issues. Zero defects were found in annual insulation and mechanical inspections. Maintenance workload was reduced by 40% compared to the old switches, significantly improving substation maintenance safety.
6. Customer Feedback: "Usune disconnect switches have significantly improved the safety and efficiency of substation operation. Their quality and stability are outstanding. We will continue to choose Usune as our preferred supplier."

Main Technical Parameters

Outer Dimensions

Project Reference

Cas-space Rocket Launch Project

Test Report

FAQ

Q1: Can the GW4 series 110kV 126kV Disconnect Switch Isolator interrupt load current or short-circuit current?

A: No. The 110kv 126kv Disconnect Switch Isolatores are designed only for circuit switching under no-load conditions with voltage. They must be used in conjunction with circuit breakers. Before operation, the circuit must be disconnected using the circuit breaker to ensure de-energization before operating the disconnect switch.

Q2: What environmental conditions is this product suitable for?

A: It can operate stably in the following environments: ambient temperature -30℃ to +40℃; altitude ≤2000m (higher altitude models can be customized upon request); pollution level from general to moderate to heavy pollution (pollution-resistant models are available); wind speed ≤35m/s; seismic intensity ≤8 degrees.

Conclusion

As a professional manufacturer of high-voltage electrical equipment, Usune Electric's GW4 series 110kv 126kv Disconnect Switch Isolator Isolators combine advanced design, high-quality materials, and precision manufacturing, making them an ideal choice for power plants, substations, and large industrial facilities. They provide safe, reliable, and long-lasting electrical isolation protection. Based on a comprehensive quality system and mature field performance, Usune is committed to supporting various critical power infrastructure projects worldwide.