Indoor Sf6 Load Switch

The Usune Indoor Sf6 Load Switch is a new generation of high-voltage switchgear specifically designed for indoor power distribution scenarios. Developed by Usune's professional R&D team, it has undergone comprehensive type testing and its performance complies with GB3804, GB16926, IEC60265, and IEC60420 standards.

As a professional manufacturer of high-voltage electrical equipment, Usune has standardized production plants in China, equipped with advanced production equipment and strict quality control processes to ensure that every product meets standards. The products use SF6 gas as the insulation and arc-extinguishing medium, offering advantages such as high insulation strength, efficient arc extinguishing, compact structure, and long service life, effectively solving the pain points of poor stability and high maintenance costs of traditional load switches.

Core Technical Parameters

1. Applicable Systems: Three-phase AC 10kV, 12kV, 24kV, 36kV, 50/60Hz
2. Arc-extinguishing Medium: SF6 gas (inert, non-toxic, high electronegativity, millisecond-level high-efficiency arc extinguishing)
3. Operating Mechanism: Spring-operated mechanism (standard manual energy storage, optional electric opening and closing for remote control)
4. Working Status: Three-position arc-extinguishing chamber: "Close-Open-Ground"
5. Sealing Performance: Dedicated dynamic and static sealing design, equipped with a pressure gauge for real-time monitoring

Application Scope

Indoor SF6 Load Switches are widely used in indoor power distribution scenarios such as industrial and mining enterprises, high-rise buildings, urban residential areas, substations, large shopping malls, airports, subways, and hospitals for switching load currents, controlling and protecting circuits, and distribution transformers; when equipped with a touchable cable front connector at the outlet, they are particularly suitable for cable branch (connection) boxes.

Main Technical Parameters

Structural Features and Safety Advantages

1. Superior Insulation and Arc-Extinguishing Structure

The upper and lower shells are injection molded with epoxy resin, forming a sealed, gas-filled inner cavity that effectively isolates the external environment. The three-position arc-extinguishing chamber completes closing, opening, and grounding operations step-by-step through the rotation of a common moving contact, ensuring clear status and reliable operation. SF6 gas has high dielectric strength and excellent arc-extinguishing performance, quickly extinguishing the arc generated during switching.

2. Reliable Sealing and Pressure Monitoring

The Indoor SF6 Load Switch employs a dedicated dynamic and static sealing design, providing excellent sealing performance and preventing SF6 gas leakage. A pressure gauge is prominently located on the mechanism box to monitor gas pressure in real time, facilitating timely detection of potential hazards by operators.

3. Comprehensive Safety Interlocks

Reliable mechanical interlocks are installed between the load switch and the grounding switch, and between the grounding switch and the front door (for cabinet-type power distribution), preventing misoperation and ensuring the safety of personnel and equipment. An equalizing protective cover is equipped at the outlet end to enhance insulation performance.

4. Flexible Operation and Space-Saving Design

Standard configuration includes a manual spring-loaded operating mechanism; optional electric opening and closing allows for remote control. Its compact structure and small footprint make it suitable for high-rise buildings, small substations, and other applications with limited installation space.

Usage Conditions

1. Normal Operating Conditions

- Ambient Temperature: -25℃～+40℃
- Altitude: Not exceeding 2000m
- Humidity: Daily average relative humidity <95%, monthly average <90%; daily average vapor pressure ≤2.2kPa, monthly average ≤1.8kPa

2. Special Operating Conditions

According to GB/T11022-1999 standard, the Indoor Sf6 Load Switch must operate under normal conditions. If the operating conditions are not met (e.g., altitude exceeding 2000m, excessive temperature and humidity, etc.), please consult with the manufacturer in advance to ensure normal product operation.

Real-World Application Case

Case Study: China Urban Metro Power Distribution Project

A key metro line requires reliable indoor high-voltage load switches for its station power distribution system, demanding high levels of equipment safety, stability, and compactness. This project selected the Usune FLN36-12D model, whose compact structure is suitable for the limited space of subways. Its reliable sealing and arc-extinguishing performance ensures stable operation in the humid underground environment. Since its commissioning in 2024, it has experienced zero failures and has received high praise from the project owner.

FAQ

Q1: What should I do if the SF6 gas pressure gauge on the switch shows an abnormal reading?

A1: Immediately stop using the switch to avoid equipment damage or safety accidents. First, check for gas leaks. If there are no leaks, wait for the temperature to recover and observe whether the pressure returns to normal. If there is a leak or the pressure cannot be restored, contact the Usune after-sales service team immediately. The manufacturer will dispatch professional technicians to handle the issue.

Q2: Can the Usune Indoor SF6 Load Switch be used in environments above 2000m altitude?

A2: Normal operating altitude does not exceed 2000m. Higher altitudes will affect insulation performance. If use in high-altitude environments, consult Usune in advance. As a professional supplier, we can provide customized solutions and adjust the insulation design to ensure stable operation.

Q3: How often does the product require maintenance, and what are the core maintenance items?

A3: Under normal conditions, a comprehensive maintenance is recommended every 1-2 years. Core items include: (1) Checking SF6 gas pressure and sealing; (2) Checking the reliability of mechanical interlocks; (3) Cleaning the switch and mechanism box surfaces; (4) Checking the accuracy of position indicators; (5) Checking the operating mechanism and adding lubricant as needed. For details, please refer to the product manual or contact after-sales service. Usune also provides professional maintenance training.

Brand Commitment and After-Sales Service

As a professional manufacturer and supplier of high-voltage electrical equipment, Usune has standardized production plants in China. Adhering to the principle of "Quality First, Safety First," all products undergo rigorous quality inspection before leaving the factory, meeting relevant certification standards to ensure product authority and reliability.

We provide comprehensive after-sales services including installation guidance, commissioning, maintenance, and technical training. Our after-sales team consists of experienced professional technicians who respond promptly to needs and provide efficient solutions. We always uphold the core concept of "Everything for the safe utilization of electricity" and work with users to create a safe and stable power distribution environment.