Magnetic circuit breakers are essential for protecting electrical installations from overloads and short circuits, ensuring safety and efficiency. With different types available, such as standard and differential, it is crucial to choose the right one according to your needs. Ensure the integrity of your equipment and the safety of people.
At GroupSumi we know that safety and efficiency are fundamental aspects of any electrical installation.
Magnetic circuit breakers play a crucial role in protecting electrical systems from overloads and short circuits, ensuring the integrity of equipment and the safety of individuals.
In this guide, we tell you everything you need to know to understand its importance and select the right device for your needs.
What is a magnetothermal circuit breaker?
A magnetic thermal circuit breaker is an electrical device designed to protect circuits from overloads and short circuits. Its design combines two mechanisms:
Thermal mechanism. This system operates through a bimetallic strip that reacts to the heat generated by an overload in the electrical circuit. When the current exceeds the safe level for which the circuit breaker is designed, the heat produced deforms the strip, causing it to move and activate the circuit interruption mechanism.
This process protects the cables and devices connected to prevent them from being damaged due to prolonged excess current. It is a gradual mechanism, ideal for responding to constant but not immediate overloads.
Magnetic mechanism. In this case, the device uses a coil that acts as a detector of sudden increases in current, typical of short circuits. When this phenomenon occurs, the flow of current generates an intense magnetic field in the coil, which instantly activates an internal mechanism that disconnects the circuit.
Unlike the thermal system, this mechanism is extremely fast, acting in milliseconds to prevent greater damage, such as fires or explosions in the electrical installation.
What is a magnetothermal circuit breaker used for?
Protects electrical equipment and appliances.
Prevents fire risks arising from electrical failures.
Ensures the continuity of the electrical supply under safe conditions.
Types of magnetic circuit breakers
The variety of circuit breakers allows for options tailored to different needs. These are the main types:
Standard magnetothermal circuit breaker. Designed to protect basic circuits, such as outlets or lights in homes and offices. It is a common and accessible option.
Differential magnetothermal circuit breaker. In addition to standard functions, it detects current leaks to ground, providing additional protection against electric shocks. Ideal for environments where the safety of individuals is a priority.
Magnetothermal with automatic reset. This type is used in critical systems, such as servers or medical equipment, as it can automatically reconnect after a disconnection. It is especially useful in applications where the interruption of the power supply must be minimized.
Difference between circuit breaker and magnetothermal switch
Although the terms "circuit breaker" and "magnetothermal" are often used interchangeably, they are not the same:
However, it does not always include specific mechanisms to differently address these failures, such as the thermal or magnetic systems found in magnetothermal devices. For this reason, they are often used in less demanding applications, such as lighting circuits or in installations where the electrical risk is low and advanced protections are not essential.
Magnetothermal. This type of switch goes a step further by integrating two protection systems into one: the thermal, which responds to gradual overloads, and the magnetic, which acts against sudden short circuits. This makes it a more advanced and safe solution for protecting both electrical equipment and installations with severe risks.
Magnetic circuit breakers are essential in residential, commercial, and industrial environments where safety and reliability are priorities. Furthermore, their ability to address different types of electrical faults makes them indispensable in more complex electrical systems.
If you are interested in learning about these topics, we recommend the following article from our blog:
When it comes to the electrical installation of a home or workplace, it is essential to understand the differences between two key components: the circuit breaker and the residual current device. Both play a fundamental role in protecting the electrical installation and, ultimately, in the safety of the people who use it. In this article, we will explore the
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Knowing this difference is key to choosing the right device according to the characteristics of your installation.
Advantages of magnetothermal circuit breakers in electrical installations
The magnetothermal circuit breakers are not only essential for electrical safety, but they also offer multiple benefits:
Comprehensive protection. They act as a barrier against overloads and short circuits, preventing serious damage to electrical equipment and reducing the risk of fires.
Reliability. They are designed to operate precisely, even in adverse conditions, ensuring consistent performance.
Safety for people. Especially in residential and work environments, they protect against electric shocks and dangerous failures.
Adaptability. They are suitable for a wide range of applications, from domestic installations to industrial environments.
How to choose the right circuit breaker.
Selecting the right switch can make the difference between a safe electrical system and a vulnerable one. Here are the key aspects to consider:
Load capacity. Choose a switch that can handle the maximum expected current intensity in your circuit. This is measured in amperes (A).
Number of poles. Depending on the type of installation, you may need a single-pole switch (one phase), double-pole (two phases), or triple-pole (three phases).
Quality certifications. Ensure that the device complies with current safety regulations, such as IEC or CE standards.
Specific use. If you need additional protection against current leaks, opt for a residual current device. For critical systems, a circuit breaker with automatic reset is the best option.
Installation and care of a magnetothermal circuit breaker
To ensure the optimal functioning of the automatic magnetothermal switches, follow these recommendations:
Hire a professional. The installation of circuit breakers requires specialized technical knowledge. A qualified electrician will ensure that the device functions correctly.
Periodic inspections. Regularly inspect the breakers for signs of wear or malfunction.
Cleaning and maintenance. Keep the electrical panels clean and free of dust, as this can affect the durability and effectiveness of the breakers.
Timely replacement. Replace the breaker if you notice it is losing sensitivity or not responding adequately to electrical faults.
The magnetic circuit breakers are an indispensable tool for ensuring electrical safety in any installation. From homes to industrial environments, these devices provide the necessary protection against overloads, short circuits, and current leaks.
At GroupSumi we have a wide range of magnetothermal circuit breakers that you can see on our page:
In our online store, you will find a wide variety of circuit breakers and residual current devices, as well as miniature circuit breakers. Find the device that best suits your needs, according to the required current rating or number of poles, among other factors. We stock leading brands such as Schneider Electric. Take a look at our ranges of Acti 9, Domae, and SB6L circuit breakers and miniature circuit breakers.
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