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We provide a comprehensive range of dependable solutions for low-voltage electrical distribution applications including circuit breakers, modular changeover switches, contactors, distribution boards, and panel meters. Our products are designed with safety in mind and are guaranteed to offer reliable performance.

TOSUNlux Modular Changeover Switch

Introducing the TSQ7-125 Modular Changeover Switch by TOSUNlux, a leading manufacturer of low-voltage electrical distribution products.

Our switch combines innovative design, easy installation, and flexible operation for seamless switching. With reliable contact points and low-temperature rise, it ensures consistent performance. Plus, with a maximum amperage of 125A and options for 1P, 2P, 3P, or 4P configurations, it offers versatility to suit various applications.

Backed by Intertek certification, our switch guarantees quality and safety, providing peace of mind for your electrical systems.

Elevate your electrical systems with TOSUNlux’s professional solutions.

TOSUNlux Modular Changeover Switch Collection

Discover TOSUNlux’s Modular Changeover Switch—your ultimate solution for seamless electrical circuit control. Engineered for precision and reliability, our switches guarantee optimal efficiency and safety. Trust TOSUNlux for your modular switch needs and experience professional-grade performance firsthand.

Why Choose TOSUNlux Brand?

Multiple Product Lines

We are a company that offers a full range of safe and reliable low-voltage electrical distribution products and lighting products.

Quality and Certification

TOSUNlux’s power supply units are high-performance, reliable, and innovative, making them suitable for the most demanding industrial applications.

More Safety

TOSUNlux low voltage products and Systems fulfill users’ needs for power, safety, and convenience, providing constant proof of their reliability in residential and commercial buildings, industry, power plants, machinery, and equipment of all kinds on every continent.

30 Years Experience

TOSUNlux is a trusted brand for power distribution because of our experience in providing innovative products and solutions for over 30 years.

Perfect dealer system

We understand the demands of the marketplace and work with distributors to achieve the highest quality customer service.


TOSUNlux ‘s Sevice experience helps simplify processes, reduce costs, and increase production, which can help customers run their operations faster, more safely, and at a lower cost.

About TOSUNlux

TOSUNlux is a manufacturer and supplier of modular changeover switches, including the LW5 and EP models. These switches can switch on, load, and break circuits under normal conditions, and can be used as switch disconnectors. The switches come in different sizes and specifications, and are designed to meet IEC60947-3 standards. The changeover switch is a low-voltage switch that switches multiple circuits by connecting or disconnecting moving contacts with static contacts.

Quality and Certification

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All Your Questions

Here are some frequently asked questions about modular changeover switches:

A modular changeover switch is used for control and isolation of two power circuits. It is a device that allows the user to switch between two power sources, such as a generator and a utility power source, in case of a power outage. It is also used in applications where two power sources need to be switched between, such as in industrial settings. The modular design of the switch allows for easy installation and customization to meet specific needs. Additionally, some modular changeover switches come with auxiliary contacts, terminal shields, inter-pole barriers, padlockable locking kits, indicator lights, and emergency features.

Some changeover switches come with auxiliary contacts, terminal shields, inter-pole barriers, padlockable locking kits, indicator lights, and emergency features.

TOSUNlux offers manual change-over switches ranging from 16 to 1000 Amperes.

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A modular changeover switch is used in solar energy systems to connect or disconnect the solar array to the grid, providing a safe and reliable way to do so. DC changeover switches are used in solar pumps for switching power between solar and grid supplies.

The automatic changeover switch can also be used in renewable energy systems, including solar, to handle the control for switching between power sources. The modular changeover switch can be used in different solar systems, including photovoltaic isolators in rooftop solar panels and AC/DC changeover in solar pumps.

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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 Selecting
Modular Changeover Switch

Types of Modular Changeover Switch

A changeover switch is an electrical device that links your home or business directly to a generator during power outages. It also serves to switch between two sources of energy, such as the commercial grid and your own personal generator.

Switches come in a variety of types, each offering its own advantages and features. In this article, we’ll take a closer look at some of the most common varieties.

  1. Manual

Residential homeowners typically opt for manual modular changeover switches. Not only are they cost-effective to install, but they require less upkeep as well.

In case of a blackout, you can manually switch the transfer switch to the ‘generator’ position so that power continues through your generator. However, do not overload it, as this could damage it.

  1. Automatic

A changeover switch is a device that switches the load from one power source to another when electricity from the main source is interrupted. It’s popular among businesses, hospitals, factories, and data centers that need to keep critical equipment running even during power outages.

These switches employ various relays and solid devices to monitor voltage changes within the electric utility system. Once they receive a signal to start up the generator, these switches transfer power from the main supply when service is restored.

  1. Hybrid

Hybrid changeover switches offer a versatile mode of operation for photovoltaic (PV) systems. When the energy from solar is not enough to power the load, these switches can function in grid-tied mode until power is restored to the load.

The modular changeover switch is a solid-state device with high surge capacity, strong turn-off capability, and a lightweight design. Additionally, its fast response time under various environmental conditions makes it indispensable for critical power distribution or electrical equipment applications.

  1. Modular

Modular changeover switches are one of the most widely used today. They come with various rated currents and transition types, allowing you to tailor them for specific applications.

Modular changeover switches are ideal for industrial and commercial applications that require the safety of electrical systems. They also serve as a backup power source in case of blackouts – particularly useful in large operations with numerous moving parts where power outages could have disastrous results.

Applications of Modular Changeover Switch

Modular changeover switches offer many applications, from emergency power supply systems to simple residential needs. They provide a safe and dependable solution in any setting.

A changeover switch’s primary purpose is to shift the load from one electrical source to another when a power outage occurs. It often works in tandem with a generator, allowing users to continue running their appliances until power is restored to their home or business.

A changeover switch is also useful to isolate a power source during an outage or prevent an overload. Depending on the type of switch, this can be done either manually or automatically, depending on its capabilities.


Working Principles of Modular Changeover Switch

The automatic changeover switch provides an efficient and dependable solution for switching power sources between inverter AC and mains AC when the generator set is in use. It is programmed so that it automatically switches appliances on or off from the generator source to the mains source when available and vice versa during power failure situations.

This type of switch requires components such as transistors, contactors, and fuse. All these pieces are essential for the operation of the system since they help regulate its voltage according to changes in supply.

Double-throw switches have multiple contacts that remain open until activated, then either close or briefly connect (known as “make” or “break”) before reopening. These may be “make-before-break” (“MBB”) or non-shorting, which briefly connects both circuits before closing them off, or “break-before-make” (“BBM”) or shorting, which interrupts one circuit before opening the other.

They are also simple to set up and operate, often featuring a modular design that saves space while cutting material handling, installation, and other costs.


Advantages of Modular Changeover Switch

Modular switchover switches have become increasingly popular for their aesthetic appeal and ease of installation. They offer plenty of versatility, ideal for changing plug orientations.

These switches can be employed in a range of applications, such as automation, security, and data transmission. They are universally affixed and don’t need country-specific adapters to function.

Safe for use with children, these appliances are energy efficient and easy to mount/enable. Plus, their long lifespan ensures great value.

Stackable modular switches are an excellent way to expand the port speed and bandwidth as your business expands. These switches can be stacked together to form a large, high-performance network that meets both your organization’s requirements and budget.

Additionally, they support copper, fiber, and PoE (Power Over Ethernet) ports. Furthermore, they offer various port speeds up to Gigabit-speed modules.

They are cost-effective and widely accessible in the market for various purposes. Furthermore, these batteries have excellent mechanical endurance; they can withstand varying voltages with ease.

Power outages offer a convenient opportunity for these devices, as they can quickly transfer electricity from a generator without requiring superfast transmission. Furthermore, these units are user-friendly and can attach themselves to any device, even without using a plug-in switch for convenience.

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