ABB TA75DU-80 Thermal Overload Relay

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1. Product Overview

The ABB TA75DU‑80 Thermal Overload Relay is a thermal overload protection device for low‑voltage AC motors. It protects three‑phase motors against overload, under‑voltage, and phase loss conditions. The relay uses a thermal bimetallic strip that responds to current changes: when current exceeds the set range, the relay trips to prevent motor overheating and damage. The TA75DU‑80 can be combined with contactors for comprehensive motor protection and is widely used in industrial motor control systems.

2. Technical Specifications

• Model: TA75DU‑80

• Product Type: Thermal Overload Relay

• Rated Current Range: 11–16 A (adjustable)

• Poles: 3

• Contactor Compatibility: Direct mount with ABB contactors

• Operating Principle: Thermal bimetal strip with current sensing

• Reset Type: Manual or automatic reset (depending on configuration)

• Trip Delay: Complies with IEC 60947‑4‑1

• Connection: Screw terminal connections

• Mechanical Life: ≥ 10,000 operations

• Electrical Life: ≥ 6,000 operations

• Ambient Temperature: –25 ℃ to +60 ℃

• Mounting: Combined with contactor or standalone

• Degree of Protection: IP20

• Standards: IEC 60947‑4‑1 / CE

3. Advantages and Features

1. Accurate Overload Protection
   Thermal bimetal strip provides reliable overload detection to protect motors.

2. Adjustable Current Range
   11–16 A adjustment range supports multiple motor sizes.

3. Flexible Reset Options
   Choose manual or automatic reset to suit different control strategies.

4. Contactor Integration
   Direct mounting with ABB contactors saves wiring and panel space.

5. Industrial Reliability
   Strong vibration, temperature resistance, and industrial grade robustness.

4. Applications

• Three‑phase AC motor protection

• Motor control in industrial automation systems

• Pump, fan, and compressor drive systems

• Machine tools and transmission equipment

• HVAC systems and facility drives

• Production line motor units

5. Installation and Usage Notes

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

2. When combined with a contactor, ensure correct wiring to prevent phase loss or mis‑tripping.

3. Make adjustments and wiring while power is off.

4. Periodically check terminal tightness and operational status to avoid poor contact.

5. Avoid long‑term exposure to high humidity, dust, or corrosive atmospheres; provide protective measures when necessary.