Overview

MV LIS ≤15kV, also known as Medium Voltage Load Interrupter Switchgear, is designed for medium-voltage power distribution systems where reliable load switching, circuit isolation, and transformer feeder protection are required. It is commonly used in distribution substations, industrial power systems, commercial buildings, utility distribution networks, and secondary unit substations.

The term LIS usually refers to Load Interrupter Switch. Compared with a medium-voltage circuit breaker switchgear, a load interrupter switchgear is mainly used for switching normal load current and providing safe isolation during maintenance. When combined with current-limiting fuses, protection relays, grounding switches, surge arresters, metering devices, or upstream protection equipment, it can provide an economical and reliable solution for transformer protection, cable feeder control, and medium-voltage distribution.

This product is suitable for systems up to 15kV class and can be customized according to project requirements. It can be designed as an incoming panel, outgoing feeder panel, transformer protection panel, tie panel, metering panel, or compact distribution unit. The switchgear can be configured for indoor installation and can also be integrated into a larger distribution system together with medium-voltage switchgear, dry-type transformers, low-voltage switchboards, and panelboards.

For international projects, MV LIS ≤15kV is a practical choice when the customer requires a compact medium-voltage distribution solution with simple operation, reliable safety protection, and lower investment cost than full circuit breaker switchgear. It is especially suitable for applications where load switching and isolation are more important than frequent fault interruption duties.

Product Advantages

1. Reliable Medium-Voltage Load Switching
MV LIS switchgear is designed to switch rated load current safely under normal operating conditions. It provides a dependable solution for opening and closing medium-voltage feeders, transformer circuits, and distribution lines. For many power distribution projects, it offers an efficient alternative to more complex breaker-based systems.

2. Compact and Cost-Effective Design
Compared with full medium-voltage metal-clad circuit breaker switchgear, load interrupter switchgear normally has a simpler structure and more compact footprint. This helps reduce equipment cost, save installation space, and simplify system operation. It is ideal for projects where practical performance, cost control, and space efficiency are important.

3. Suitable for Transformer Protection
MV LIS ≤15kV is widely used for transformer feeder protection. When equipped with medium-voltage current-limiting fuses, it can help protect transformers against short-circuit faults. This configuration is commonly used in unit substations, commercial buildings, industrial facilities, and power distribution rooms.

4. Safe Isolation and Maintenance
The product provides a clear isolation function for maintenance and inspection. Depending on the design, the switchgear can be equipped with grounding switches, mechanical interlocks, viewing windows, position indicators, and padlock devices to improve operator safety. These functions help prevent misoperation and support safer maintenance procedures.

5. Flexible Panel Configuration
The switchgear can be configured according to different system designs. Available functions may include incoming switching, outgoing feeder switching, transformer protection, metering, cable connection, grounding, surge protection, and auxiliary control. This flexibility allows the product to meet different project requirements in power distribution networks.

6. Integration with Complete Distribution Systems
MV LIS ≤15kV can be used as part of a complete distribution solution. It can be installed together with medium-voltage main switchgear, dry-type transformers, low-voltage switchboards, low-voltage panelboards, and outdoor distribution enclosures. This makes it suitable for secondary unit substations and integrated power distribution projects.

7. Simple Operation and Low Maintenance
The product is designed for convenient operation and long-term service. The load interrupter switch mechanism is easy to operate, and the overall system requires relatively low maintenance compared with more complex switchgear structures. For many industrial and commercial users, this helps reduce maintenance workload and operating cost.

8. Customizable for International Projects
MV LIS ≤15kV can be customized based on rated voltage, rated current, short-circuit level, fuse rating, enclosure type, cable entry direction, busbar arrangement, control scheme, metering requirement, and installation environment. This makes it suitable for overseas projects with different grid standards, project specifications, and customer requirements.

Product Specifications

Product Applications

MV LIS ≤15kV is suitable for medium-voltage distribution systems that require load switching, safe isolation, and transformer feeder protection. It is commonly used in utility distribution, industrial power distribution, commercial buildings, public infrastructure, and integrated substation projects.

In transformer protection applications, the product can be installed on the medium-voltage side of a transformer. When combined with suitable fuses and protection devices, it helps protect the transformer from short-circuit faults and provides a safe isolation point for maintenance. This is a common configuration in unit substations and building power distribution systems.

In industrial facilities, MV LIS switchgear can be used for medium-voltage feeders supplying production lines, workshops, motors, transformers, and auxiliary power systems. Its compact structure and simple operation make it suitable for factories, manufacturing plants, mining facilities, chemical plants, cement plants, and other industrial environments.

In commercial and infrastructure projects, MV LIS ≤15kV can be used in office buildings, shopping malls, hospitals, schools, airports, railway stations, water treatment plants, and municipal engineering projects. These applications require reliable medium-voltage distribution equipment that is easy to operate and maintain.

In renewable energy and distributed generation projects, the product can be used for feeder switching, transformer protection, and medium-voltage power collection systems. It can support solar power stations, wind power projects, energy storage systems, and distributed generation facilities when configured according to project requirements.

For secondary unit substations, MV LIS ≤15kV can be integrated with dry-type transformers and low-voltage distribution equipment to form a complete power distribution solution. This integrated layout is suitable for projects requiring compact installation, simplified engineering, and reliable power distribution from medium voltage to low voltage.

Overall, MV LIS ≤15kV Medium Voltage Load Interrupter Switchgear is a practical and economical medium-voltage switching solution. It is suitable for customers who need reliable switching, safe isolation, transformer protection, flexible configuration, and easy system integration. With customized design options, it can meet the requirements of different power distribution projects in international markets.