ABB TA25DU Thermal Overload Relay

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1. Product Overview

The ABB TA25DU is an industrial-grade thermal overload relay designed for AC motor protection. It detects motor overload conditions and interrupts the circuit when the current exceeds the rated value, preventing motor overheating and damage. The TA25DU is typically used with ABB contactors to form a complete motor protection and control system, widely applied in industrial automation, pumps, fans, and compressors.

2. Technical Specifications

Electrical Specifications

• Model: TA25DU

• Type: Thermal Overload Relay

• Rated Current Range: 0.1 – 0.16 A (adjustable per version)

• Rated Operating Voltage: 600 V AC

• Rated Frequency: 50/60 Hz

• Tripping Characteristic: Thermal, according to IEC 60947-4-1 standard

• Auxiliary Contacts: 1NC+1NO (for alarm and control signaling)

• Reset Type: Manual / Automatic (depending on model)

• Mechanical Life: ≥ 1,000,000 operations

Environmental & Installation

• Operating Temperature: –25°C … +60°C

• Protection Degree: IP20

• Mounting: Directly on ABB contactors (e.g., EH, EHX series)

• Wiring: Bolted main terminals; screw terminals for auxiliary contacts

• Dimensions (approx.): 90 mm × 45 mm × 70 mm

• Weight (approx.): 0.3 kg

3. Advantages & Key Features

1. Accurate overload protection — Thermal element simulates motor heating for precise tripping.

2. Adjustable current range — Flexible adjustment to match motor rated current.

3. Auxiliary contacts — Supports alarm and control circuit signals.

4. High reliability — Industrial-grade design suitable for high temperature, humidity, and frequent operation.

5. Easy installation — Direct combination with ABB contactors saves space.

6. Manual / automatic reset — Available in different versions for diverse control needs.

4. Application Areas

• Industrial AC motor protection

• Pumps, fans, compressors, and conveyor equipment

• Industrial automation production lines

• HVAC motor protection

• Motor distribution control panels

• Factory equipment safety interlocks and control systems

5. Precautions

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

2. Verify wiring of auxiliary contacts and control circuits.

3. Avoid direct installation in high humidity, corrosive, or dusty environments.

4. Regularly check relay operation and contact status to ensure reliable performance.

5. Disconnect power before disassembly or maintenance to prevent electric shock or equipment damage.

6. Adjust reset type and delay based on motor starting frequency and ambient temperature.

The structure and details of the product：

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