Overview
The ABB TA25DU thermal overload relay is a three-pole protective device designed for motor circuit applications requiring reliable overload detection and trip response. Rated at 690V (IEC) / 600V (UL/CSA), it delivers Class 10 thermal protection for motors operating in demanding industrial environments. This relay conforms to EN/IEC 60947-4-1, VDE0660, NF C63 650, and BS4941 standards, making it suitable for applications across Europe, North America, and international markets.
Key Features
- Three-pole thermal bimetallic design with 13–19A setting range
- 690V rated insulation voltage (IEC); 600V (UL/CSA); 6 kV impulse withstand
- Selectable manual or automatic reset for flexible operation modes
- Auxiliary contacts for remote trip indication and signaling
- Direct mounting on ABB A-Line Series contactors (A9–A40 frame sizes)
- Shock and vibration resistant (12 g shock; 8 g vibration at 50 Hz, ±1 mm)
Technical Specifications
- Rated Insulation Voltage (Ui): 690V (IEC); 600V (UL/CSA)
- Rated Impulse Withstand (Uimp): 6 kV
- Current Setting Range: 13–19A
- Trip Class: 10 (per EN/IEC 60947-4-1)
- Poles: 3
- Permissible Ambient Temperature (Storage): –40 to +70 °C
- Permissible Ambient Temperature (Operation, Compensated): –25 to +55 °C
- Mounting: Latching below contactor; screw fixing on main terminals
- Shock Duration: 15 ms at nominal Ie
- Standards Compliance: EN/IEC 60947-4-1, UL, CSA, VDE0660, NF C63 650, BS4941
- Reset Options: Manual or Automatic (selectable)
Typical Applications
The TA25DU is ideal for:
- Asynchronous motor protection in industrial automation and manufacturing
- Motor starter assemblies with A-Line contactors
- Panel-mounted motor control circuits requiring compact protection
- Applications requiring thermal-magnetic coordination per IEC standards
- Marine, offshore, and heavy industrial environments where robust thermal sensing is essential
Compatibility & Replacements
This relay is designed as a direct replacement for OEM TA25DU assemblies and is compatible with ABB A-Line Series contactors in frame sizes A9 through A40 (also designated A/AE/AL series). The TA25DU family includes multiple amp-setting variants (1.3–1.8A, 2.5–3.8A, 4–6A, 6–10A, 10–14A, 13–19A, and higher ranges), allowing engineers to select the exact current rating needed without redesigning the contactor footprint. Terminal blocks and auxiliary contact modules (such as LC and DS series accessories) are available for custom configurations. Always verify contactor model compatibility and auxiliary contact requirements before installation.
