ABB TA25DU-5.0 thermal overload relay

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ABB TA25DU-5.0 Thermal Overload Relay – Product Information

1. Product Overview

The ABB TA25DU-5.0 thermal overload relay is designed for motor protection against overload, phase failure, and stall conditions.
With an adjustable current range of 3.2–5.0 A, it works seamlessly with AF series contactors (AF09–AF38) to form a complete motor control and protection system.
It ensures reliable thermal protection for motors in industrial automation and distribution applications.

2. Technical Specifications

• Model: TA25DU-5.0

• Type: Thermal Overload Relay

• Current Adjustment Range: 3.2 A – 5.0 A

• Compatible Contactors: AF09, AF12, AF16, AF26, AF38

• Rated Insulation Voltage (Ui): 690 V AC

• Frequency: 50/60 Hz

• Tripping Class: Class 10A

• Protection Type: Bimetal thermal protection

• Phase Failure Protection: Yes

• Reset Mode: Manual / Automatic selectable

• Test Function: Built-in test button

• Auxiliary Contacts: 1 NO + 1 NC

• Mounting Method: Direct mounting under contactor or separate installation

• Ambient Temperature: -25 ℃ to +70 ℃

• Storage Temperature: -40 ℃ to +85 ℃

• Protection Class: IP20

• Weight: Approx. 0.2 kg

• Standards & Certifications: IEC 60947-4-1, CE, UL, CSA

3. Features and Advantages

1. Accurate protection – Provides sensitive thermal and phase-failure protection.

2. Compact design – Space-saving structure for easy cabinet installation.

3. Dual reset modes – Manual and automatic reset options for flexible operation.

4. High reliability – Rapid tripping during phase imbalance to protect motors.

5. Wide compatibility – Suitable for various ABB AF series contactors.

6. Durable construction – High thermal resistance and vibration tolerance.

4. Application Areas

• Industrial automation systems

• Motor control centers (MCCs)

• Pumps, fans, and compressors

• Conveyor and process line control

• Building and commercial electrical systems

• Small power distribution panels

5. Precautions

1. Ensure the current setting matches the motor’s rated current.

2. Protect the relay from moisture, vibration, and extreme temperatures.

3. Disconnect the main power before wiring or maintenance.

4. Check terminal tightness periodically to prevent loose connections.

5. Do not exceed the rated voltage, current, or temperature range.

6. Installation and commissioning should be carried out by qualified personnel.

The structure and details of the product：

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