Indoor Type Isolation Switch

The GN series Indoor Type Isolation Switch is a no-load switching device specifically designed for indoor high-voltage systems. It achieves physical power disconnection by providing a visible isolation gap, making it an essential device for the safe maintenance of electrical equipment and systems.

Structural Features

1. Modular Design: Composed of three independent single-pole units, which can be flexibly combined into a three-pole integrated structure, adaptable to various installation scenarios.

2. High-current conductivity system: Employs high-strength copper alloy contacts, offering excellent conductivity and thermal stability, capable of withstanding long-term operation with currents up to 10,000A.

3. Reliable insulation performance: Equipped with high-quality anti-pollution insulators, suitable for Class III and IV pollution environments.

4. Optional grounding switch: Some models integrate a grounding switch, achieving safe grounding of the isolation circuit and enhancing operational safety.

Model Description

Applicable Standards

As a professional supplier of high-voltage electrical equipment, Usune strictly adheres to national and industry standards to ensure product quality and safety:

- GB 1985-2014 "High-voltage AC disconnecting switches and grounding switches"
- GB/T 11022-2011 "Common technical requirements for high-voltage switchgear and controlgear standards"
- DL/T 486-2010 "Technical ordering conditions for high-voltage AC disconnecting switches and grounding switches"
- DL/T 593-2006 "Technical requirements for high-voltage switchgear and controlgear"

Technical Parameters

1. Voltage and Current Specifications

- Voltage Ratings: 12kV, 20kV, 35kV
- Rated Current: 2000A, 3150A, 4000A, 5000A, 6000A, 8000A, 9000A, 10000A
- Rated Short-Time Withstand Current: Maximum 80kA

2. Product Categories

- By Function: Ungrounded, Single Grounded, Through-Wall Type
- By Operation Method: Manual, Electric (Optional)

Usage Conditions

Indoor Type Isolation Switch is suitable for harsh industrial environments and has wide adaptability:

1. Ambient Temperature: -50℃ ~ +50℃
2. Altitude: ≤2000m (Altitude ≥2500m can be customized to enhance adaptability)
3. Wind Pressure: ≤700Pa (equivalent to wind speed ≤34m/s)
4. Seismic Intensity: ≤8
5. Icing Thickness: ≤20mm
6. Pollution Level: Class III, IV
7. Installation Environment: No flammable or explosive hazards, no chemical corrosion, and no severe vibration

Outer dimension

Project Reference

Cas-space Rocket Launch Project

Test Report

Practical Application

Case: A large steel plant in East China needed to equip its 20kV generator outlet system with high-current isolation equipment. The plant environment was harsh (high dust, Class IV pollution) and had high current requirements (8000A), placing strict requirements on equipment reliability. Ultimately, the factory selected the Usune GN□-20DW/8000-80 disconnector switch. The core reasons were its pollution-resistant design, adaptability to Class IV pollution environments, 8000A rated current matching the generator output load, and integrated grounding switch ensuring maintenance safety. Since its commissioning in 2023, the equipment has operated stably for over two years, providing reliable isolation during monthly maintenance, eliminating the risk of electric shock. The pollution-resistant insulators show no obvious aging or discharge marks, significantly reducing maintenance frequency and costs, proving that the Usune GN series disconnector switch is an ideal choice for heavy-duty industrial power systems.

FAQ

Q1: What is the core difference between a disconnector switch and a load switch?

A1: A disconnector switch is a no-load switching device with no arc-extinguishing capability; it is only used to isolate the circuit after the circuit breaker disconnects the load. A load switch can disconnect a certain load current. The GN series disconnector switch provides a visible isolation gap, ensuring absolute safety during maintenance.

Q2: Can the GN series Indoor Type Isolation Switch operate normally in high-altitude areas (≥2500m)?

A2: Yes. The standard model is suitable for altitudes ≤2000m. For altitudes ≥2500m, Usune can enhance insulation and mechanical performance according to user needs to ensure stable equipment operation.

Q3: What maintenance is required for the GN series disconnect switches?

A3: Regular maintenance includes: (1) Checking insulators for cracks and discharge marks; (2) Testing contact pressure and temperature (≤70℃ at rated current); (3) Verifying the integrity of the grounding switch and interlocking device; (4) Regularly lubricating the operating mechanism. Proper maintenance can guarantee a service life of 20-30 years.

The Usune GN series Indoor Type Isolation Switch combines advanced technology, reliable performance, and wide adaptability, making it the preferred product for large power plants, steel mills, and industrial power systems. As a leading manufacturer in China's high-voltage electrical industry, Zhejiang Usune Electric Co., Ltd., relying on its professional R&D team, strict quality control system, and rich project experience, provides users with high-quality products and customized solutions. Whether for new projects or equipment upgrades, it can provide safe, stable, and efficient power isolation protection.