ABB TA25DU Thermal Overload Relay for Three Phase Motors

Description:

The ABB TA25DU Thermal Overload Relay is used in motor starter circuits to provide overload, phase loss, and phase imbalance protection for three-phase motors. Commonly installed with ABB contactors in motor control centers, conveyors, pumps, compressors, fans, and industrial machinery requiring reliable motor protection. Maintenance teams and system integrators use this relay for motor starter assemblies, control panel construction, equipment upgrades, and replacement of failed overload protection devices. The TA25DU series mounts directly to compatible ABB contactors for compact motor starter installations.

Applications:

The ABB TA25DU thermal overload relay is commonly used to protect electric motors from overheating caused by overload conditions, phase failure, and phase imbalance. Typical applications for the TA25DU include conveyors, HVAC systems, pumps, mixers, compressors, machine tools, and material handling equipment utilizing ABB A-Line contactors and motor starters. The relay automatically disconnects the motor circuit when current exceeds the adjustable setting for a predetermined period.

Technical Specifications:

• Manufacturer: ABB
• Model / Part Number: TA25DU
• Product Type: Thermal Overload Relay
• Series: TA25DU Series
• Relay Type: Electromechanical Thermal Overload Relay
• Current Adjustment Range: 0.10 A to 32 A depending on variant
• Protection Functions: Overload, Phase Loss, and Phase Imbalance Protection
• Tripping Class: Class 10A standard (Class 20 versions available)
• Mounting Type: Direct Mount to ABB Contactors or Separate Panel Mount
• Compatible Contactors: A9-A40, AX9-AX32, AL9-AL40, TAL9-TAL40 depending on model
• Auxiliary Contacts: 1 NO + 1 NC
• Main Circuit Voltage Rating: Up to 690 VAC
• Frequency: 50/60 Hz
• Reset Type: Selectable Manual or Automatic Reset
• Trip Indication: Mechanical Trip Indicator Included
• Ambient Compensation: -25°C to +55°C
• Terminal Type: Screw Terminals
• Protection Rating: IP10/IP20
• Standards Compliance: IEC, UL, and CSA Approved
• Operating Temperature: -25°C to +55°C
• Application: Three-Phase Motor Protection
• Installation: Close-Coupled or Separate Mounting Available

Common Replacements:

• ABB TA42DU Thermal Overload Relay
• ABB TF42 Thermal Overload Relay
• Siemens 3RU11 Thermal Overload Relay