ABB TA75DU25 Thermal Overload Relay

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• • 1. Product Overview

    The ABB TA75DU25 is a thermal overload relay designed for protecting three-phase motors against overload, phase loss, and stall conditions. Commonly paired with ABB contactors such as the A75 series, it provides reliable thermal protection based on a bimetal mechanism. It is widely used in industrial motor control systems to ensure safe and continuous operation.

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    2. Main Technical Specifications

    • Model: TA75DU25

    • Compatible Contactors: A75 series, some AF models

    • Adjustable Current Range: Typically 16–25 A

    • Protection Types:

      • Thermal overload

      • Phase loss protection

      • Locked-rotor protection

    • Trip Class: Class 10A / 10 / 20 (depending on version)

    • Reset Mode: Manual / Automatic

    • Auxiliary Contacts: 1 NO + 1 NC

    • Mounting: Direct mounting on contactor or baseplate mounting

    • Operating Temperature: –20°C to +60°C

    • Short-circuit Coordination: Requires external short-circuit protection

    • Vibration Resistance: Enhanced anti-vibration structure

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    3. Advantages & Features

    1. Accurate Motor Overload Protection

    • Bimetal sensing for reliable thermal response

    • Prevents overheating and motor damage

    2. Wide Adjustable Range

    • Adjustable current setting for different motor ratings

    • Flexible for various applications

    3. Multiple Protective Functions

    • Built-in phase loss detection

    • Quick trip during motor stall

    • Temperature compensation improves accuracy

    4. Easy Installation

    • Direct mounting on ABB contactors

    • Also supports standalone mounting

    5. Easy Maintenance

    • Clear setting dial

    • Test button and manual/automatic reset selector

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    4. Application Fields

    • Three-phase motor overload protection

    • Pumps and compressors

    • Fans and HVAC equipment

    • Conveyors and industrial machinery

    • Factory automation and control panels

    • Process industry motor starters

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    5. Notes and Precautions

     

    • Always set the relay according to the motor’s rated current

    • Not designed for short-circuit protection—use with fuses or circuit breakers

    • Avoid installation in corrosive or high-humidity environments

    • Periodically test trip functionality

    • Phase-loss protection works under balanced load conditions

    • Recalibrate if operating in high ambient temperature

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