Overview
The ABB TA25DU1.0 thermal overload relay is an industrial-grade electromechanical protection device engineered for direct mounting on ABB A9–A40 and BC9–BC30 frame contactors. This model covers the 0.63–1.0A setting range and is designated with code letter E. Thermal overload relays are economic electromechanical protection devices for the main circuit, offering reliable protection for motors in the event of overload or phase failure.
Key Features
- 3-pole design with manual or automatic resetting mode selection
- Temperature compensation, trip contact (NC), signal contact (NO), automatic or manual reset selectable, trip-free mechanism, STOP and Test function, and trip indication
- Housing IP20 protection rating with main circuit terminals IP10
- Forms a compact starting solution when combined with contactors
Technical Specifications
- Setting Range: 0.63–1.0 A
- Trip Class: 10A
- Poles: 3
- Reset: Manual or Automatic selectable
- Operating Temperature: −25 to +55°C (compensated); Storage −40 to +70°C
- Degree of Protection: IP20 (housing), IP10 (main circuit terminals)
- Rated Impulse Withstand Voltage: 6 kV (main and auxiliary circuits)
- Standards: IEC/EN 60947-1, IEC/EN 60947-4-1, IEC/EN 60947-5-1, UL 60947-1, UL 60947-4-1
- Mounting: Clips directly to contactor frame
- Auxiliary Contacts: Separate contact blocks for different circuits
Typical Applications
The TA25DU series is widely used for protecting motors across 0.1–80A and is known for reliability and flexibility, mounting directly onto ABB contactors with consistent trip response. Common uses include:
- Small fractional-horsepower motor protection
- HVAC and pump motors
- Heating, ventilation, and air-conditioning motors prone to phase loss and voltage imbalance, with protection ensuring continuous operation in commercial and residential projects
- Machine tool and industrial automation control circuits
Compatibility & Replacements
The TA25DU1.0 is designed for use with ABB A-line contactors (A9, A16, A25, A30, A40) and BC-frame contactors (BC9, BC16, BC25, BC30). Compatible auxiliary coils include the DS25-A for remote electrical tripping and the DR25-A for remote electrical resetting. When selecting a replacement, verify the setting range (code letter) and contactor frame size. Other TA25DU models in different current ranges (0.16A, 0.25A, 0.4A, 0.63A, 1.4A, 1.8A, 2.4A, 3.1A, 4.0A, 5.0A) are available for different motor ratings.
