11KV RMU Panels Indoor Medium Voltage Load Break Switches

In the medium-voltage electrical power distribution networks, various of switchgears are used to ensure the safe and reliable delivery of electricity. Among these, the load break switches are critical components in these switchgears such as ring main units,eco-friendly switchgears and gas-sinsulated switchgears, They are the specialized components designed to handle the routine demands of energizing and de-energizing electrical circuits. the KDK-12D/1250-20 series 11KV RMU Panels Indoor Medium Voltage Load Break Switches manufactured by Contele have received widespread praise from domestic and foreign customers for a long time

Model and meanings

What is a Load break Switch?

11kV RMU Panels Indoor Medium Voltage Load Break Switches are electrical switching devices located between disconnecting switches and circuit breakers, capable of interrupting current under normal circuit and specified overload conditions. They can safely interrupt operating current but are not suitable for interrupting short-circuit currents (fault currents). They are typically equipped with basic arc-extinguishing devices, capable of handling normal load arcs but insufficient to extinguish high-intensity short-circuit arcs.

Working Principle of a Load Break Switch

The key to load break switches lies in the safe management of electric arcs. When the contacts separate, the current ionizes the air or dielectric, forming a conductive path. If the arc is not controlled, it will damage the contacts and delay disconnection.

Commonly used arc extinguishing methods include:

1. Oil immersion arc extinguishing: The contacts are immersed in insulating oil. The heat generated by the arc decomposes the oil, forming high-pressure hydrogen gas that quickly extinguishes the arc.

2. Gas arc extinguishing (jet type): Solid arc-extinguishing material is heated and vaporized, ejecting gas to extinguish the arc.

3. Compressed air or gas arc extinguishing: Mechanically supplied air extinguishes the arc (such as early SF₆).

4. Vacuum arc extinguishing: The contacts are sealed in a vacuum bottle. At AC zero point, the arc is instantly extinguished, restoring the dielectric strength.

Main Functions

11KV RMU Panels Indoor Medium Voltage Load Break Switches are the very important components for the ring main units and eco-friendly switchgears, they have various of critical functions:

1. Routine Circuit Switching: Can be operated manually or remotely to enable/disable power supply to and from the line, suitable for maintenance or ring network switching.

2. Current Carrying Capacity and Withstand Capacity: Can carry rated current and withstand the mechanical and thermal stress of short-circuit current for a short period.

3. Visual Isolation Point: Provides a reliable visual disconnection point, ensuring the safety of maintenance personnel.

4. Protection in conjunction with fuses: In a ring network unit, the load switch works in conjunction with fuses to achieve automatic fault disconnection, preventing single-phase operation from damaging the load.

Load Break Switch vs Disconnector vs Vacuum Circuit Breaker

To fully appreciate the role of the load switch, it is essential to compare it with its counterparts.

Overall,The load switch is a efficienc, specialized function component for the medium-voltage ring main unit or eco-friendly switchgear. By mastering the safe interruption of load currents and seamlessly partnering with fuses for fault protection, it provides an economical, compact, and reliable solution for the vast majority of switching operations in medium-voltage distribution networks. While the disconnector provides safety through isolation, and the circuit breaker provides comprehensive protection, the load switch is the workhorse that actively manages the flow of power on a day-to-day basis.

Technical Parameters

Appearance and Dimension

FAQ

Q1. What is the main job of a load break switch?

A:The 11KV RMU Panels Indoor Medium Voltage Load Break Switches main function is to turn the power on and off. we use a load break switch to cut the power safely when an electrician needs to do maintenance on a line.It is designed to handle the normal current that flows through the system every day.

Q2. How long does a load break switch usually last?

A:Most modern load break switches, especially the ones using vacuum technology, are very durable. They are rated for a specific number of operations (for example, 1, 000 or 2, 000 times). Under normal working conditions, they can last for decades without needing to replace the main parts.

Q3. Is a load break switch safe to touch?

A:In modern switchgear, the load break switch itself is usually sealed inside a metal tank (like in a "gas-insulated" or "eco-friendly switchgear). You cannot touch it directly. The outside of the cabinet is grounded, so if the equipment is properly installed, it is safe for operators to stand in front of it and operate the handle.

Q4. Why is a load switch cheaper than a circuit breaker?

A:A circuit breaker is a very complex machine. It has to be strong enough to catch and stop a huge lightning-like burst of energy (a short circuit). A load break switch only has to stop the normal flow of electricity. Because the parts inside don't have to be as heavy-duty, the manufacturing cost is lower.

Q5. Can I use a load break switch for a big factory motor?

A:Usually, no. Large motors create special problems when you turn them off. They require a device (like a contactor or a specific circuit breaker) that is designed to handle that specific type of electrical kickback. Load break switches are best for cables, distribution lines, and transformers.

Our After-Sales Service Commitment

We believe that our partnership with you began after the transaction was completed. Our company is committed to providing reliable support to ensure that your equipment can operate smoothly throughout its entire lifespan. Here are the services you can obtain from us:

Technical Support and Training: Remote guidance and free training; first year of free maintenance.

Rapid Response: Inquiries handled within 1 hour, ensuring timely problem resolution.

Lifetime Consultation: Technical consultation and support provided throughout the entire equipment lifecycle.

Customer Cases

1. State Grid East China Regional Power Distribution Project

2. Qinghai Province New Energy Base 1600MW Photovoltaic Project

3. Tajikistan Aini Gold Mine 110kV Substation Expansion

4. Sichuan-Tibet Railway Complete Power Equipment Supply

Why Choose Cotenele Electric?

1. Professional manufacturer in China, factory direct supply, supports bulk purchasing.

2. Products are ISO9001/14001/18001 certified.

3. Years of experience cooperating with domestic and international clients, real-world case studies guarantee success.

4. Innovative R&D, continuously upgrading the RHSV series environmentally friendly gas cabinets.

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