ABB TF140DU-142 thermal overload relay with adjustable current range from 110 to 142 A, designed for industrial motor protection and automation systems.
£298.72
The ABB TF140DU-142 Thermal Overload Relay (1SAZ431201R1004) is a heavy-duty electromechanical motor protection relay designed to provide dependable overload and phase failure protection for larger three-phase motors operating in demanding industrial environments. As part of the proven ABB TF140DU thermal overload relay series, it is engineered for direct mounting onto compatible ABB AF116 and AF140 contactors, making it an ideal solution for industrial motor starters, machinery and electrical control panels.
Designed to maximise motor reliability while reducing costly downtime, the TF140DU-142 features temperature compensation, phase loss sensitivity and a Trip Class 10A characteristic for accurate overload protection. Integrated auxiliary contacts, selectable manual or automatic reset and built-in STOP and TEST functions simplify commissioning and maintenance while ensuring safe operation in demanding industrial environments.
With an adjustable current setting range of 110 to 142 A, the TF140DU-142 is ideally suited for protecting larger industrial motors used in conveyors, compressors, pumps, fans and heavy manufacturing equipment. Its rugged construction ensures dependable long-term performance in continuous industrial service.
Thermal overload relays continuously monitor motor current and disconnect the motor whenever prolonged overload conditions or phase failure occur. This helps prevent overheating, extend motor service life and minimise unexpected downtime across industrial installations.
The ABB TF140DU series is trusted by OEMs, panel builders and maintenance engineers for dependable motor protection, straightforward installation and seamless compatibility with ABB AF contactors. Its robust construction ensures long service life in demanding industrial environments.
| Current | 140 A |
|---|---|
| Phase | Three Phase |
| IP Rating | IP20 |
| Series | TF140DU Thermal Overload Relays |
| Product code | 1SAZ431201R1004 |
| Product type | Thermal overload relay |
| Current adjustment range | 110 to 142 A |
| Rated operational current | 140 A |
| Trip class | Class 10A |
| Number of poles | 3P |
| Auxiliary contacts | 1 NO + 1 NC |
| Rated insulation voltage | 690 V AC |
| Rated operational voltage | Main circuit 690 V AC / 440 V DC |
| Rated impulse withstand voltage | Auxiliary circuit 6 kV, main circuit 8 kV |
| Protection rating | Housing IP20, terminals IP10 |
| Reset method | Automatic or manual |
| Mounting type | Direct attachment to contactor |
| Suitable contactors | ABB AF116, AF140 |
| Terminal type | Screw terminals |
| Dimensions (H × W × D) | approx. 140 × 89 × 126 mm |
| Weight | approx. 0.82 kg |
| Operating temperature | approx. -25 °C to +55 °C |
| Standards | IEC/EN 60947-1, IEC/EN 60947-4-1, IEC/EN 60947-5-1, UL 60947-1, UL 60947-4-1 |
The TF140DU-142 protects three-phase motors against overload conditions and phase failure in industrial motor control applications.
The relay provides an adjustable overload current setting from 110 to 142 A.
Yes. The TF140DU-142 supports both manual and automatic reset to suit different installation requirements.
It is designed for direct mounting onto compatible ABB AF116 and AF140 contactors.
It provides reliable thermal overload and phase failure protection for three-phase industrial motors while helping extend motor service life.
ABB TF140DU thermal overload relays are trusted worldwide by machine builders, electrical contractors and maintenance engineers for dependable motor protection, long service life and seamless integration into industrial motor starter assemblies.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...