Thermal overload relay for MC50a-65a series contactor, current 34-50A MT-63 34-50A

Thermal overload relay for contactor – protection of motors and circuits

The MT-63 thermal relay, designed to work with MC-50a and MC-65a contactors, is a reliable safety element for electrical installations. Its main task is to protect motors and circuits from the effects of overloads, phase failures and long starting times. This device finds application in a wide spectrum of industrial applications where continuity and safety of operation are key.

Construction and application

The MT-63 relay is a bimetallic overload relay, which means it uses the phenomenon of thermal expansion of bimetal to detect overheating. If the set current threshold is exceeded, the bimetal deforms, causing the contacts to disconnect and the circuit to be switched off. This prevents the protected device from being damaged. This relay can be mounted directly under the contactor or separately, using a dedicated mounting base UZ-63L. The current setting range of this model is from 34 to 50A, making it a universal solution for many applications.

Key features and benefits

• Wide adjustment range: possibility of precise adjustment to the load characteristics (34-50A).
• Compatibility: dedicated to MC-50a and MC-65a contactors of the METASOL series, ensuring seamless integration with existing installations.
• High reliability: bimetallic construction guarantees stable and repeatable operation in various environmental conditions.
• Auxiliary NO + NC contacts: allow the implementation of various signaling and control functions in the automation system.
• Easy installation: direct or mounting on a dedicated UZ-63L base facilitates installation and servicing.
• Overload protection: protects motors and circuits from damage caused by excessive current draw.
• Phase failure protection: detects the absence of one of the supply phases, preventing damage to the motor.
• Rotor blocking protection: reacts to long-term mechanical blockages of the motor, protecting it from overheating.

The MT-63 relay is a solid and effective solution for every installer and end user looking for reliable protection of their electrical devices. Its versatility and ease of installation make it an ideal choice for both new installations and modernization of existing systems.