One-Stop Solution To Electric

Our range of Automatic Changeover Switches is crafted with premium materials, ensuring exceptional durability, reliability, and efficiency. Seamlessly transfer power for uninterrupted electricity during outages.

TOSUNlux Double Power Automatic Changeover Switch

Ensure uninterrupted power supply for your critical applications with the TSMQ1-100 modular double power automatic changeover switch. The switch is suitable in power supply system with 50/60Hz, rated voltage up to 415V and rated up to 100A. The seamless automatic switching between common and standby power supply ensures a reliable energy backup, perfect for high-rise buildings, shopping malls, fire pumps, smoke elimination fans, elevators, and emergency lighting applications. Trust in its versatility and reliability to keep your critical systems running without interruption.

TOSUNlux Double Power Automatic Changeover Switch is a reliable and efficient solution crafted with premium materials. Seamlessly transfer power between common and standby sources, ensuring uninterrupted electricity supply during outages. 

TOSUNlux Automatic Transfer Switch

TOSUNlux offers different models of Double Power Automatic Changeover Switch to meet your needs for safe and reliable solutions.

HGLD-400A 4P

rated insulation voltage up to 1000V, rated voltage up to 400V


auto control switch, manual control switch, common switching on indicator


suitable in terminal type double-circuit power supply system with 50Hz/60Hz

Why Choose TOSUNlux Brand?

There are several reasons to choose TOSUNlux changeover switch for your electrical needs:

Multiple Product Lines

TOSUNlux boasts a comprehensive selection of products, catering to a wide array of needs and applications, ensuring a perfect fit for every requirement.

Advanced Technology

Utilizing state-of-the-art advancements, TOSUNlux products are equipped with cutting-edge features, delivering top-notch performance and unparalleled user experiences.

Quality Assurance

Committed to excellence, TOSUNlux subjects all products to rigorous quality checks, guaranteeing dependable and long-lasting solutions and earning customers’ trust.

Safety and Certification

Prioritizing user safety, TOSUNlux adheres to stringent safety standards and certifications, providing peace of mind and confidence in their product’s reliability.

Great Dealer System

Supported by a robust and efficient dealer network, TOSUNlux ensures seamless distribution, prompt service, and exceptional customer support for an enriched experience.

Cost-Effective and Bulk Production Capacity

With cost-effectiveness at the core of operations and a robust bulk production capacity, TOSUNlux delivers competitive pricing and readily available solutions for various project scales.

About TOSUNlux

TOSUN is a Changeover Switch Manufacturer renowned for its expertise in various electrical devices. Established in 1994, we take pride in delivering cutting-edge solutions for seamless electrical control. Our commitment extends to a diverse range of innovative automatic changeover switches, catering to various industrial demands with unwavering dedication.

Quality and Certification

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All Your Questions

Here are some frequently asked questions about TOSUNlux Automatic Changeover Switch(automatic transfer switch):

An Automatic Transfer Switch (ATS) is an electrical switch that automatically transfers a power supply from its primary source to a backup source when it senses a failure or outage in the primary source. It is a self-acting, intelligent power switching device governed by dedicated control logic. An ATS is often installed where a backup generator is located, so that the generator may provide temporary electrical power if the utility source fails. Once installed, the ATS can automatically switch between electricity coming from the utility and generator power. The switch transition mode of an ATS may be Open Transition (OT) or Closed Transition (CT). An open transition transfer switch is also called a break-before-make transfer switch.

An automatic changeover switch works by monitoring the primary power supply and the backup power source (like a generator). When the primary supply fails or experiences an outage, the switch swiftly transfers the load to the backup source. Once the primary supply is restored, it switches back automatically, ensuring uninterrupted power flow.

When choosing a changeover switch, consider factors like the required load capacity, voltage compatibility, and the number of poles needed for your specific application. Additionally, assess the switch’s quality, safety features, and reliability to ensure it meets your power control needs effectively and provides seamless switching between power sources.

One-Stop Solution To Electric

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We manufacture and supply the highest quality Automatic Changeover Switches. As a trusted partner, we collaborate with distributors to meet the increasing demand for seamless power control solutions.



Automatic Changeover Switches find applications across various industries and settings. They are essential in high-rise buildings, providing uninterrupted power to elevators and emergency lighting systems during outages. In commercial establishments like shopping malls, they ensure the continuous operation of critical equipment like fire pumps and smoke elimination fans. Additionally, in industrial facilities, these switches are vital for reliable power supply to essential machinery. Their compatibility with generators and mains supply makes them ideal for backup power solutions, ensuring uninterrupted operations in critical situations. 

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We Help Your Business to Connect and Grow on Large Scale

TOSUNlux has its own design team with a 5-people in-house design team, which provides 4-5 new series of products every year for our clients.

The Complete Guide to Double Power Automatic Changeover Switch


In this comprehensive article, we delve into the world of double-power automatic changeover switches that ensure seamless power control in various applications. Learn about their essential functions and discover their benefits. 

What Is a Double Power Automatic Changeover Switch?

A Double Power Automatic Changeover Switch is an essentially electrical device designed to automatically switch between two power sources seamlessly. 

It ensures an uninterrupted power supply in case of a primary power failure or outage. When the main power source fails, the switch swiftly transfers the load to a standby or backup power source, such as a generator. 

Once the primary power is restored, the switch automatically transfers the load back, ensuring continuous electricity without any manual intervention. 

How Does a Double Power Automatic Changeover Switch Work?

A Double Power Automatic Changeover Switch works by continuously monitoring the primary power source and the backup power supply, usually a generator. When the primary power fails or experiences an outage, the switch immediately detects the change and initiates the switching process. 

It disconnects the load from the main power supply and seamlessly connects it to the backup source. This automatic transfer ensures an uninterrupted power supply during the transition. Once the primary power is restored, the switch detects the return of power and switches back to the main supply again without any interruption. This process guarantees a seamless and reliable power transfer, eliminating the need for manual intervention during power failures.

Advantages of Double Power Automatic Changeover Switch

The Double Power Automatic Changeover Switch offers numerous advantages that make it an essential component for power control and management in various applications. Here are the key benefits:

  •    Uninterrupted Power Supply:The primary advantage of these switches is their ability to provide uninterrupted power during outages by swiftly transferring the load to the backup power source.
  •    Automated Operation:The automatic nature of these switches eliminates the need for manual intervention during power failures, ensuring a seamless power transfer without human involvement.
  •    Reliable Power Backup:With the inclusion of a backup power source, these switches ensure a reliable power backup system, protecting critical equipment and maintaining operations during unforeseen power interruptions.
  •    Protection against Power Fluctuations:The switches act as a safeguard against sudden power fluctuations or voltage spikes, preventing damage to sensitive electrical devices and equipment.
  •    Enhanced Safety:The automated switching process reduces the risk of accidents that may occur during manual switching, ensuring the safety of personnel during power failures.
  •    Compatibility with Multiple Power Sources:These switches are designed to be compatible with various power sources, including generators and mains supply, offering flexibility and adaptability to different setups.

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