ABB TA75DU-63 Thermal Overload Relay

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1. Product Overview

The ABB TA75DU-63 Thermal Overload Relay is a motor protection device designed to protect three-phase AC motors from overload, overheating, and phase loss. The TA75DU-63 uses a bimetallic strip to sense current changes and provide thermal overload protection. It can be combined with contactors to ensure reliable motor start-stop and protection. This relay is widely used in industrial automation, motor control, and factory equipment systems.

2. Technical Specifications

• Model: TA75DU-63

• Product Type: Thermal Overload Relay

• Rated Current Range: 6–10 A (adjustable)

• Poles: 3

• Operation Type: Manual / Automatic reset

• Operating Voltage: AC 50/60 Hz, compatible with contactor voltage

• Trip Time: Compliant with IEC 60947-4-1

• Protection Functions: Overload, phase-loss, and overheating protection

• Connection: Screw terminals

• Mechanical Life: ≥ 10,000 operations

• Electrical Life: ≥ 6,000 operations

• Mounting: Directly combinable with contactors

• Operating Temperature Range: –25 ℃ to +60 ℃

• Degree of Protection: IP20

• Standards: IEC 60947-4-1, CE

3. Advantages and Features

1. Accurate Overload Protection
   Bimetallic strip senses motor current in real time to prevent overload damage.

2. Adjustable Current Range
   Supports 6–10 A adjustment, suitable for different motor specifications.

3. Flexible Reset Options
   Manual or automatic reset for different application requirements.

4. Contactor Compatibility
   Can be directly combined with ABB contactors for complete motor protection.

5. Industrial-Grade Reliability
   Long-term stable operation in industrial environments, supporting high temperature, humidity, and vibration.

4. Applications

• Three-phase industrial motor protection

• Pump, fan, and compressor control systems

• Factory automation production lines

• HVAC motor control

• Electromechanical and industrial machinery protection

5. Installation and Usage Notes

1. Verify the relay rated current matches the motor rated current before installation.

2. When used with a contactor, ensure correct wiring to prevent false trips.

3. Adjust current range or install relay with power off.

4. Regularly inspect relay and wiring to ensure long-term protection reliability.

5. Avoid use in highly corrosive or humid environments; provide protective measures if needed.