Why Choose the ABB TA25DU14RT Thermal Overload Relay?
The ABB TA25DU14RT is a thermal overload relay with ring tongue terminals designed to provide reliable motor protection against overload and phase failure in industrial motor-control applications. As part of the proven ABB TA25DU-RT thermal overload relay series, it uses three bimetal tripping elements to monitor motor current and disconnect the control circuit when a sustained overload occurs.
This model provides an adjustable motor-current setting range of 10–14 A and trip class 10A, making it suitable for protecting motors whose rated current falls within this range. The relay is phase-loss sensitive and temperature compensated, helping maintain dependable protection across normal industrial operating conditions.
The TA25DU14RT incorporates 1 normally closed and 1 normally open auxiliary contact, front-accessible TEST and STOP functions, trip indication and selectable manual or automatic reset. The RT version uses ring tongue terminal connections, providing secure bolted conductor termination for applications where ring tongue lugs are preferred.
Key Advantages
- Reliable thermal motor overload and phase-failure protection.
- Adjustable 10–14 A motor-current setting range.
- Trip class 10A for standard motor-starting applications.
- Ring tongue terminals provide secure conductor connections.
- Phase-loss sensitive for enhanced three-phase motor protection.
- Manual or automatic reset can be selected to suit the control system.
- Integrated TEST and STOP functions simplify commissioning and maintenance.
- Includes 1 NO + 1 NC auxiliary contacts for signalling and contactor control.
Key Features
- ABB TA25DU-RT thermal overload relay series.
- 10–14 A adjustable current setting range.
- Trip class 10A.
- Three-pole thermal overload protection using bimetal tripping elements.
- Phase-loss sensitive according to IEC/EN 60947-4-1.
- 1 NO + 1 NC electrically isolated auxiliary contacts.
- Selectable manual or automatic reset.
- Front-mounted TEST and STOP controls.
- Visible trip indication.
- Integrated ambient-temperature compensation.
- Suitable for three-phase and single-phase applications.
- Main-circuit ring tongue terminal connections.
Reliable Thermal Protection for Industrial Motors
Thermal overload relays protect motors by monitoring the current flowing through bimetal tripping elements. When an overload causes excessive heating for a sufficient period, the ABB TA25DU14RT changes the state of its auxiliary contacts, allowing the associated contactor to disconnect the motor before prolonged overcurrent can cause damaging thermal stress.
The TA25DU-RT design also responds to phase-loss conditions and provides temperature compensation for dependable operation across its specified ambient range. Its adjustable 10–14 A setting enables the protection threshold to be matched to the motor rated current, while ring tongue connections provide robust termination in industrial control assemblies.
Typical Applications
- Three-phase motor overload protection.
- Industrial motor starters.
- Pumps, fans and compressors.
- Conveyors and material handling systems.
- Machine tools and production machinery.
- Industrial automation and control panels.
- Applications requiring secure ring tongue terminal connections.
