[ 09.04.2023 ]

ETI Elektroelement d.d. is one of the leading manufacturers of fuses and protective switching devices. It successfully exports its products to 60 countries worldwide. Due to its status and high quality products, the company aims to strengthen its position in the global market of electrical engineering.

ETI Elektroelement d.d. has its own design office, which allows the company to develop new products and constantly improve existing ones. Currently, the plant produces various products made of plastic, rubber and other materials, including a variety of electrical devices and equipment.

Among the products of ETI Elektroelement d.d. you can find the following products:

• Air circuit breakers (ETIPOWER): used to protect electrical networks against overloads and short circuits.
• Industrial circuit breakers (ETIBREAK): used to protect industrial electrical networks against overloads and short circuits in more demanding operating conditions.
• Motor protection circuit breakers (ASTI): protect motors against overloads, short circuits, phase asymmetry and other undesirable situations.
• Modular and power contactors (ETICON): used to control electrical circuits, including the control of high-power loads.
• Fuses (D, D0, C, NH): used to protect electrical circuits and equipment against overloads and short circuits.
• Reactive power compensation equipment.

In this article, we will look at motor protection circuit breakers and their functions.

Motor protection circuit breakers are electromechanical devices that are part of relay protection systems. They perform their work by opening the contacts when the power supply limits are exceeded.

The main functions that motor protection circuit breakers perform depend on their model and include the following:

• Protection against short-circuits in the electrical network or in the motor itself. Automatic switch-off when a short circuit is detected prevents damage and ensures safety.
• Protection against continuous overloads caused by excessive mechanical loads on the motor shaft. The protection circuit breakers react to the overload and interrupt the power supply to prevent damage.
• Protection against phase asymmetry or phase failure. If an asymmetry or phase failure is detected, automatic shutdown prevents malfunction and damage.
• Protection against overheating of the electric motor. This function is realised by means of special temperature sensors located inside the motor. When a certain temperature is reached, the protection is automatically activated and shutdown takes place.
• Protection against unstable voltage. Motor protection circuit breakers can react to unstable mains voltage and prevent damage to the motor.

The MPE25 series motor protection circuit breakers are designed for starting and protecting small electric motors. They provide reliable protection against overloads and short circuits. In addition, they can be used as emergency or main circuit breakers. In combination with CE and CEM contactors, they allow the creation of remote control systems, extending the possibilities and functionality.

Motor protection circuit breaker MPE25-0,16

The MSP series motor protection circuit breakers offer a number of advantages that make them indispensable in the field of electric motors:

• Thermal protection testing capability, which allows you to check the performance of the protection mechanism. This guarantees reliable motor protection and ensures safe operation.
• Phase failure protection, which ensures continuous operation of the electric motor even if one or more phases are disconnected. This prevents damage and ensures the stability of the system.
• Operating temperature range, allowing the use of automatic motor protection devices in various operating conditions. They are able to function in a wide temperature range, which ensures their reliability and flexibility.
• A wide range of optional accessories to customise and improve the functionality of the motor protection circuit breakers. These accessories allow them to be customised to specific requirements and provide greater flexibility in use.

Motor protection switch MSP0-0,6

MSP series motor protection circuit breakers are designed to start and protect electric motors up to 52 A against short-circuit currents and overloads. They can be used as main or emergency circuit breakers and are ideal for indoor installation under normal environmental conditions. The combination of their advantages makes the MSP series motor protection circuit breakers a reliable and efficient solution for motor protection and control.

The MS25 series motor protection circuit breakers are designed to start and protect small capacity motors. They can be used as main or emergency circuit breakers. Features of this series include the ability to test thermal protection and phase failure protection. There are 14 thermal protection ranges available with adjustability from 0.1 A to 32 A. A lockout lockout feature is also provided. A wide range of optional accessories are available to extend the functionality.

MSP-AS signal contacts

The MS25 series motor protection circuit breakers provide reliable protection and efficient starting of small motors. The selection of the optimum thermal protection range and the use of optional accessories allow the circuit breakers to be customised to meet specific requirements. It is the ideal solution to ensure safe and reliable motor operation in a variety of applications.