Thermal overload relay for MC9b-40a series contactor, current 16-22A MT-32 16-22A

Thermal overload relay for contactor – protection of motors and circuits

The MT-32 thermal relay, designed to work with MC-9b-40a series contactors, is a reliable device used to protect AC motors and electrical circuits against overloads. Its function is to react to excessively long starting times, motor stalling, and phase asymmetry, preventing damage and downtime. The relay's bimetal construction provides precise and effective protection.

Construction and application

The MT-32 relay is compatible with a wide range of LS contactors, including MC-9b, MC-12b, MC-18b, MC-22b, MC-32a and MC-40a. The possibility of direct mounting under the contactor or using a dedicated UZ-63L base provides installation flexibility. The device finds application in various industrial applications where protection of electric motors against overloads is required.

Key features and benefits

• Wide adjustment range: The MT-32 relay with a current range of 16-22A allows adaptation to different loads.
• Protection against various disturbances: Protects against overloads, phase failures and motor starting problems.
• Compatibility with LS contactors: Ensures seamless integration with popular LS contactors.
• Installation flexibility: Direct or mounting on a dedicated UZ-63L base simplifies installation in various conditions.
• Meets safety standards: Compliance with IEC/EN 60947-1 and IEC/EN 60947-4-1 standards guarantees safe use.
• Durability in harsh conditions: Operation at temperatures from -25°C to +60°C (depending on the model) ensures reliability in demanding industrial environments.
• Quality certificates: It has CE, CSA, UL and CCC certificates confirming high quality and compliance with international standards.

Technical parameters (for information)

The MT-32 relay is characterized by high resistance to shocks (15gn – 11ms) and vibrations (6G), making it an ideal solution for industrial applications. It also has high insulation (6kV) and impulse resistance (6kV). It is equipped with one NO + NC auxiliary contact with characteristics of 5A at AC15 C600/R300 voltage. The possibility of connecting wires with a cross-section of 18AWG / 1mm² using screw terminals ensures easy installation.