ABB TA450SU-140 thermal overload relay

ABB TA450SU-140 Thermal Overload Relay – Product Information

1. Product Overview

The ABB TA450SU-140 thermal overload relay is a high-performance protection device designed for AC motor overload, phase failure, and long-term operation protection. It is designed to work seamlessly with ABB contactors such as the A185 to A300 series, providing reliable motor protection and control. Based on the bimetal thermal principle, it features a compact design, high sensitivity, and easy installation, making it ideal for various industrial automation and power systems.

2. Technical Specifications

• Model: TA450SU-140

• Adjustable Current Range: 100 A – 140 A

• Compatible Contactors: A185, A210, A260, A300

• Number of Poles: 3 (three-phase protection)

• Rated Operational Voltage (Ue): 690 V AC, 50/60 Hz

• Rated Insulation Voltage (Ui): 1000 V AC

• Trip Class: Class 10A

• Auxiliary Contacts: 1 NO + 1 NC

• Reset Type: Manual / Automatic selectable

• Mounting: Direct mounting onto contactor

• Operating Temperature: −20 ℃ to +60 ℃

• Phase Failure Protection: Available

• Mechanical Life: ≥ 1,000,000 operations

3. Features and Advantages

1. High Reliability – Accurate bimetal elements ensure precise overload protection.

2. Easy Installation – Modular design allows direct mounting with contactors without extra wiring.

3. Comprehensive Protection – Protects against overload, phase failure, and stall conditions.

4. Adjustable Setting – Adjustable current range for different motor ratings.

5. Durable Construction – High-strength housing and vibration-resistant design for harsh environments.

6. User-Friendly Operation – Clear reset and test buttons for convenient maintenance.

4. Application Fields

• Industrial automation systems

• Pumps, fans, and water treatment plants

• Conveyors and compressors

• Power distribution systems

• Building HVAC control systems

• Mining and metallurgy machinery

5. Precautions

1. Ensure the relay setting matches the motor’s rated current before installation.

2. Make sure terminals are tightly connected to the contactor.

3. Avoid using in humid or corrosive environments.

4. Regularly inspect bimetal and contact condition to prevent malfunction.

5. Adjust the setting slightly in high-temperature environments.

6. Always disconnect power before performing maintenance.

The structure and details of the product：

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