ABB TF42-0.74 thermal overload relay with adjustable current range from 0.55 to 0.74 A, designed for industrial motor protection and automation systems.
£60.13
The ABB TF42-0.74 Thermal Overload Relay (1SAZ721201R1021) is a dependable electromechanical motor protection device designed to protect three-phase motors against overload conditions and phase failure. As part of the trusted ABB TF42 thermal overload relay series, it delivers reliable overload protection while helping minimise downtime, improve equipment reliability and extend motor service life.
Designed for direct mounting onto compatible ABB AF09 to AF38 contactors, the TF42-0.74 combines straightforward installation with dependable performance. It incorporates temperature compensation, selectable automatic or manual reset, integrated auxiliary contacts, trip indication, a trip-free mechanism and STOP/TEST functions, making it ideal for industrial motor starter applications.
With an adjustable current range of 0.55 to 0.74 A and Trip Class 10 protection, the ABB 1SAZ721201R1021 is ideally suited to protecting small three-phase motors used in conveyors, pumps, fans, machine tools, packaging machinery and industrial automation systems.
Thermal overload relays continuously monitor motor current and disconnect the control circuit whenever prolonged overload or phase failure is detected. This protects motors against overheating, insulation damage and premature failure while improving equipment reliability and reducing maintenance costs.
The ABB TF42 series is widely used in industrial motor starters and electrical control panels where dependable overload protection and seamless compatibility with ABB AF contactors are essential. Its compact design makes it suitable for OEM machinery, manufacturing plants and industrial automation systems.
| Current | 0.74 A |
|---|---|
| Phase | Three Phase |
| IP Rating | IP20 |
| Series | TF42 Thermal Overload Relays |
| Product code | 1SAZ721201R1021 |
| Product type | Thermal overload relay |
| Current adjustment range | 0.55 to 0.74 A |
| Rated operational current | 0.74 A |
| Trip class | Class 10 |
| Number of poles | 3 |
| Auxiliary contacts | 1 NO + 1 NC |
| Rated insulation voltage | 690 V AC |
| Rated operational voltage | Auxiliary circuit 600 V AC/DC |
| Protection rating | IP20 |
| Reset method | Automatic or manual |
| Mounting type | Direct attachment to contactor |
| Terminal type | Screw terminals |
| Dimensions (H × W × D) | approx. 88.3 × 45 × 70.5 mm |
| Operating temperature | approx. -25 °C to +60 °C |
| Weight | approx. 0.13 kg |
It protects small three-phase motors against overload conditions and phase failure, helping prevent motor damage and unexpected downtime.
The relay has an adjustable overload setting range of 0.55 to 0.74 A.
Yes. It includes 1 normally open (NO) and 1 normally closed (NC) auxiliary contact.
Yes. The reset mode can be selected for either automatic or manual operation depending on the application.
It is designed for direct mounting onto compatible ABB AF09, AF12, AF16, AF26, AF30 and AF38 contactors.
ABB TF42 thermal overload relays are trusted by machine builders, panel manufacturers and maintenance engineers worldwide for dependable motor protection, long service life and seamless integration into industrial control systems.
● Service Agreements
Credit Accounts
Our service agreements are built to support long term procurement relationships. By working closely with engineering teams and procurement departments, we help streamline purchasing processes while ensuring consistent access to critical components and sourcing support when it matters most.
● frequently asked questions
At Led Controls Ltd we help engineers source the right automation and control gear with confidence. below are quick answers to what we are asked most often.
We supply all leading manfacturers in our industry. we offer next day delivery on most poplour products.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
Your content goes here. Edit or remove this text inline or in the module Content settings. You can also style every aspect of this content in the module Design settings and even apply custom CSS to this text in the module Advanced settings.
● latest blog
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...