One-Stop Solution To Electric

Discover a wide range of dependable low-voltage electrical distribution products at your fingertips. Our comprehensive selection encompasses essential solutions such as Residual Current Operated Circuit Breakers, Miniature Circuit Breakers, contactors, distribution boards, and panel meters.

TOSUNlux Residual Current Operated Circuit Breaker

Stay protected from electric shock and fire! Discover TOSUNlux RCBO that shield you from ground faults and overcurrents.

The TOSUNlux Residual Current operated Circuit breaker (RCBO) is designed for you to detect and interrupt current when it exceeds safe levels to prevent electrical failure.

TOSUNlux’s TSN3-32L RCBO is durable and reliable, withstands harsh environments, and offers up to 10000 cycles of mechanical durability and 4000 cycles of electrical durability. The product has the advantages of small size, the width is 18mm only which keeps more space in distribution box.  and high breaking capacity, it is 6KA. It cuts both the fire line and the zero line. It also protects personnel from electric shocks when fire lines are connected in reverse. More guarantee for circuit protection as the contact form of the product is double breaking points. It switches on and off both L line and N linesynchronously. The product has been certified by INTERTEK.

TOSUNLux Residual Current Operated Circuit Breaker

Take a look at TOSUNlux residual current operated circuit breaker collection. 


Rated Breaking Capacity: 6000A
Withstand Voltage:4000V


the TSN4-40L is Designed for DIN rail distribution


used in the single phase circuit of AC 50/60Hz, rated voltage 240V

Why Choose TOSUNlux Brand?

Wide range of products

TOSUNlux offers a full range of safe and reliable solutions for circuit breakers, isolating switches, enclosures, panel boards, and switchboards. We also have a wide range of lighting products

International presence

We have agents of the TOSUNlux brand appointed in 51 countries such as Morocco, Malta, Portugal, Cyprus, Oman, Ukraine, Zimbabwe, Dominican Republic, Venezuela, Chile, and Myanmar. This makes it easier for you to access our products and services.

Quality And Certification

Our products at TOSUNlux have various certificates such as CE, CB, TUV, and RoHS. These certificates ensure that our products meet international standards and are safe for your use.

Professional team

At TOSUNlux, we have a professional team combined of several companies and branches for manufacturing, quality inspection, product R&D, brand promotion, and international trading

Perfect dealer system

At TOSUNlux, we recognize the dynamic needs of the market and collaborate closely with distributors to ensure exceptional customer service of the utmost quality.


With TOSUNlux’s extensive service experience, we streamline processes, minimize costs, and enhance production efficiency. By leveraging our expertise, customers can accelerate their operations, improve safety measures, and achieve cost savings.

About TOSUNlux

TOSUNlux is a Chinese manufacturer of electrical circuit breakers, including the TSN3-63L Residual Current Operated Circuit Breaker used in circuits where electrical appliances or equipment are in close proximity to water, such as bathrooms, kitchens, outdoor areas, and swimming pools.

Our product range encompasses diverse models with varying specifications, renowned globally for their unwavering reliability and impeccable safety standards.

Quality and Certification

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All Your Questions

Here are some frequently asked questions about TOSUNlux Residual Current Operated Circuit Breaker

An RCBO (Residual Current Operated Circuit Breaker) is a device that ensures electrical safety by monitoring current in a circuit. It consists of an RCD (Residual Current Device) that detects ground faults and a circuit breaker that protects against overcurrent situations. When an imbalance or fault is detected, the RCD trips, cutting off the electricity flow to prevent electric shocks and fire hazards. Additionally, the circuit breaker trips if the current exceeds a safe level. This combination of functions makes the RCBO an essential component in electrical systems, providing reliable protection against electrical faults and enhancing overall safety.

An RCD is a standalone device that is designed to protect against electrical shocks caused by ground faults. It continuously monitors the current flowing in a circuit and quickly detects any imbalance between the live and neutral wires. If a fault is detected, such as current leakage to the ground, the RCD trips and cuts off the electricity supply, preventing potential electric shocks.

On the other hand, an RCBO combines the functions of an RCD and a circuit breaker into a single device. In addition to providing protection against ground faults, an RCBO also safeguards against overcurrent situations. It can detect both leakage current and excessive current flow, offering a dual layer of protection. If a fault or overcurrent event occurs, the RCBO trips, disconnecting the circuit to ensure safety.

  1. Ensure safety by turning off the power supply to the circuit.

  2. Identify the line (hot/live) and neutral wires in the electrical panel.

  3. Connect the line wire from the power source to the RCBO’s line terminal. Connect the neutral wire to the RCBO’s neutral terminal.

  4. Identify the load wires going to the devices or circuits you want to protect.

  5. Connect the load line wire to the RCBO’s load terminal. Connect the load neutral wire to the RCBO’s load neutral terminal.

  6. Double-check all connections for accuracy and security. Avoid exposed or touching wires.

  7. Restore the power supply and test the RCBO to ensure proper functioning.

Remember to consult a qualified electrician or follow the manufacturer’s instructions for the specific RCBO model. Electrical work should be performed by professionals or individuals with appropriate knowledge to ensure safety and compliance with regulations.

One-Stop Solution To Electric

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At TOSUNlux, we possess a deep understanding of the dynamic marketplace and collaborate closely with our esteemed distributors to deliver unparalleled customer service of the utmost quality.



The TSN1-40L Residual Current Operated Circuit Breaker is suitable for use in a variety of applications where residual current protection is required, such as in residential, commercial, and industrial settings. It can be used to protect electrical equipment and installations against earth leakage and can cut off the fault circuit immediately on the occasion of shock hazard or earth leakage of the trunk. The device can be combined with over-current protection (fuses or circuit breakers) to provide comprehensive protection against electrical hazards

More Reliable Solution To Electric

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.

How Do You Select The Right MCB Or RCBO?

Factors when selecting MCB or RCBO

In most cases, the MCB or RCBO you choose should be rated for the current they handle. You should also check their trip characteristics and look for extra features and safety approvals. Your electrical installation is unique, so the right MCB or RCBO is crucial. Consider these factors when selecting MCB or RCBO.

  • Overcurrent Characteristics

The overcurrent characteristics of Type B, C or D MCB or RCBO are determined by the trip times of the devices. In real-world situations, it is important to ensure that the breakers trip within a reasonable time. For example, an MCB can trip in forty seconds at two times its rated current. It will allow for this brief surge to occur and prevent damage to the device.

An RCBO is a resizable circuit breaker. It can be used to protect a lighting circuit and provides protection from electric shocks. Its main purpose is to interrupt the flow of power to a water heater. An MCB or RCBO is a device that monitors the flow of current in a line and interrupts the circuit during a short circuit, overload, or earth leakage. These devices are also used in distribution boards to protect from overcurrent.

An RCBO or MCB can protect against electric shock or fire by detecting overcurrent. MCBs are a safer alternative to RCCBs and can be used in homes. They provide circuit isolation but are less durable than RCBs. RCBOs are generally designed to interrupt power for a short period of time and are often safer to use. 

  • Basic Applications

A manual circuit breaker (MCB) is an electrical device that trips in an overload or short circuit situation. It causes an interruption of the load circuit when it trips. The operating knob moved to the off position when the MCB tripped. There are several types of MCBs, with short circuit breaking capacities. You need to consider the basic applications of Type B, C or D devices. Type B devices are well-suited for domestic use, providing reliable protection in residential settings. Type C devices, on the other hand, are ideal for commercial and industrial applications, delivering robust performance in demanding environments. Finally, Type D devices are specifically designed for industries with high inrush currents, ensuring effective protection in such scenarios. By considering these distinctions, you can make an informed decision and choose the appropriate device based on your specific application requirements.

  • Tripping Characteristics of MCB

Different MCBs and RCBOs offer various trip characteristics, such as B, C, or D curves. Consider the type of load and its starting current to select the appropriate trip curve for optimal protection and sensitivity. Tripping characteristics of MCBs are illustrated graphically in a trip curve chart. The thermal region represents the bi-metal tripping unit, and it gradually slopes downwards as a result of a gradual overload. The B-type MCB has a tripping range of 3 to 5 times the rated current. A D curve tripping characteristic is four seconds slower than a K curve. This gives the circuit more time to ride through high in-rush at start-up. The C-type tripping time is approximately 5 to 10 times. The D curve has a tripping range of 10 to 20 times the rated current.

  • Unwanted Tripping

The most important thing to know when selecting an MCB or RCBO is how to troubleshoot it. You can also check the safety rating of the device before you purchase it to avoid unwanted tripping.

Both types of MCBs and RCBOs can trip a circuit when an overcurrent occurs. However, an RCBO may not trip an overcurrent if it detects a low voltage or an overcurrent condition. An MCB that protects against both types of overloads and short circuits i

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