3RT1036-1AP00 | SIEMENS Power contactor

Protecting an electric motor is essential to ensure its durability, safety and proper operation.

What is electric motor protection?

Protecting an electric motor is essential to ensure its durability, safety and proper operation. Motor protections are devices that monitor and react to anomalies potentially dangerous for the motor and the installation. They
cover a wide range of problems, from short circuits to overloading.

The circuit breaker is one of the most common devices to ensure this safety. It ensures automatic power cut-off in the event of an anomaly. For example, in the presence of excessively high currents resulting from an overload or a short circuit, the circuit breaker trips to stop the current flow and protect the electric motor.

The connection of the motor also plays a crucial role. Whether for a single-phase motor, often used in domestic applications, or a three-phase motor, more common in the industrial sector, it is imperative to have correctly made and secure connections to avoid voltage imbalances or other problems.

Asynchronous motors, widely used in industry, must also require special attention, particularly when they are connected to a speed variator. The latter, by modulating voltage and currents, can induce overloads if it is not correctly calibrated or protected.

Finally, any protection system must be integrated into a well-designed electrical panel. This table brings together and organizes all the protections, allowing centralized monitoring and rapid intervention in the event of an anomaly.

Which electrical installations require a protection device?

The importance of electrical protection in any installation cannot be overstated. It is used to protect equipment against various anomalies, overvoltages or short circuits which could compromise their integrity or cause dangers for the user.

Here are some electrical installations which absolutely require a protection device:

Transformers: These devices convert the supply voltage from one level to another. A power surge can seriously damage the transformer and devices connected to it. The transformer coils must be protected against overcurrents using specific protection devices.

Asynchronous machine: Very commonly used in industry, the asynchronous motor is subject to overcurrents. Overload protection, often via a thermal relay, is necessary to prevent damage to the motor. Engine ventilation is also crucial to prevent overheating.

Electrical installation with resistances: Devices containing resistances, such as certain heaters, can overheat if an overcurrent occurs. They therefore require suitable protection devices, housed in an electrical box for better organization.

Circuits with coils: Coils, present in many devices and machines, must be protected against overcurrents which could cause damage.
Installations with power electronics: These installations manage high currents and voltages. An outage or surge can cause damage considerable. A disconnect device allows rapid shutdown in the event of a problem, and an emergency stop can be used for immediate manual intervention.

Installations requiring an electrical box or box: These boxes
often combine several protection devices, such as differential circuit breakers. The differential is essential for detecting current leakage and
trigger a rapid cut-off, thus protecting people against the risk of electrocution.
Installations requiring ventilation: To prevent overheating of certain
equipment, it is essential to guarantee adequate ventilation, particularly when there are resistors or power electronics present.

Any electrical device or machine, large or small, requires some form of protection. Whether protecting against power surges or any other anomaly, protective devices are the last line between safe operation and possible accident or equipment damage. The installation and regular maintenance of these protections guarantee the longevity and safety of any electrical system.

Why buy your electric motor protection with kheoos?

Buying your engine protection with kheeos means above all choosing excellence. Indeed, we stand out for the superior quality of our spare parts. Each frequency variator, power supply, switch, fuse, cable, or electrical wires of various sections is rigorously selected and certified to guarantee perfect compliance with current regulations.

kheoos ensures that the condition of each element is suitable for the use for which it is sold, combining performance and safety.

Beyond quality, choosing kheoos also means opting for an eco-responsible approach. By offering reconditioned lighting solutions, second-hand electrical boxes, or even protection relays and differential circuit breakers sold as new, Kheoos involves you in the active fight against industrial waste.

Trusting kheoos for the purchase of your electric motor protection devices means not only ensuring cutting-edge equipment, but also adopting a committed approach for a more sustainable industrial future.