TF42-4.2 Thermal overload relay 1SAZ721201R1035

Motor protection with thermal overload relay TF42-4.2

The TF42-4.2 thermal overload relay is a reliable device used to protect electric motors from overload. Designed by ABB, this model provides effective protection in installations with voltages up to 690V AC, and its current setting range of 3.1…4.2A makes it an ideal solution for various industrial and commercial applications. The device is compatible with AF09 – AF38 series contactors, which simplifies integration into existing control systems.

Construction and functionality

The TF42-4.2 relay is characterized by the possibility of manual or automatic reset, which provides flexibility in adapting to the specific needs of the installation. It has a built-in reset button that allows for quick restoration of operation after a shutdown caused by an overload. Additionally, it is equipped with a tripping mechanism that prevents restarting in the event of a persistent fault condition – the STOP function increases work safety. The presence of one normally open and one normally closed auxiliary contact allows for signaling the device status and remote control of other system elements.

Mounting and application

The relay is mounted directly, which simplifies the installation process and minimizes downtime. The device is used to protect electric motors in various industries, such as:

• Food industry
• Chemical industry
• Automotive industry
• Construction
• HVAC systems (heating, ventilation and air conditioning)

Thanks to its compact dimensions (45 x 88.3 x 70.5 mm) and temperature compensation capabilities, the TF42-4.2 relay can be used in harsh environmental conditions. The use of high-quality materials ensures long-lasting and reliable operation of the device, minimizing the risk of failure and repair costs. Additionally, it has a protection degree of IP20, which provides protection against accidental contact.