ABB EF750-800 electronic overload relay with adjustable 250-800 A setting range, selectable trip classes and integrated phase failure protection for industrial motor control applications.
£1,199.02
The ABB EF750-800 Electronic Overload Relay (Part Number: 1SAX821001R1101) is a heavy-duty electronic motor overload protection relay designed to provide accurate protection for large three-phase motors against overload, phase failure and overheating. As part of the advanced ABB EF750 electronic overload relay series, it delivers dependable motor protection for high-power industrial applications while helping maximise equipment reliability and minimise unplanned downtime.
Using advanced electronic sensing technology, the EF750-800 delivers highly accurate motor protection across a wide operating temperature range. The relay is self-powered, requiring no external control supply, and features selectable Trip Class 10E, 20E and 30E to suit a variety of motor starting characteristics. It also incorporates temperature compensation, automatic or manual reset selection, STOP and TEST functions, and clear trip indication for simplified maintenance and diagnostics.
With an adjustable current setting range of 250-800 A, integrated auxiliary contacts and rugged industrial construction, the EF750-800 is ideally suited for protecting high-power motors used in mining, heavy manufacturing, pumping stations, compressors, conveyors and industrial process plants. It is designed for direct mounting onto compatible ABB AF580 and AF750 contactors.
Electronic overload relays continuously monitor motor current and rapidly detect overload or phase loss conditions before damage occurs. This helps reduce costly downtime, extend motor service life and improve the reliability of high-power industrial equipment.
The ABB EF750 series combines excellent measurement accuracy, temperature compensation and adjustable trip characteristics, making it an ideal solution for OEM machine builders, industrial panel builders and maintenance professionals responsible for large motor installations.
| Current | 800 A |
|---|---|
| Phase | Three Phase |
| IP Rating | IP20 |
| Series | EF750 |
| Part number | 1SAX821001R1101 |
| Product type | Electronic overload relay |
| Current setting range | 250–800 A |
| Rated operational current | 800 A |
| Trip classes | 10E / 20E / 30E selectable |
| Rated operational voltage | Main circuit 1000 V AC |
| Auxiliary circuit voltage | 600 V AC/DC |
| Rated insulation voltage | 1000 V |
| Rated impulse withstand voltage | Main circuit 8 kV |
| Number of poles | 3P |
| Auxiliary contacts | 1 NC + 1 NO |
| Connection type | Screw terminals |
| Degree of protection | Housing IP20, terminals IP00 |
| Mounting type | Direct attachment to contactor |
| Frequency | 50 / 60 Hz |
| Operating temperature | approx. -25 °C to +70 °C |
| Standards | IEC/EN 60947-4-1, UL 60947-4-1 |
| Dimensions (W × H × D) | approx. 244 × 111.6 × 187.73 mm |
| Weight | approx. 2.765 kg |
The EF750-800 protects large three-phase electric motors against overload, phase failure and overheating in heavy industrial motor control applications.
The relay provides an adjustable protection range from 250 A to 800 A.
No. The relay is self-powered and operates without an additional external control supply.
The relay supports selectable Trip Class 10E, 20E and 30E for different motor starting requirements.
The EF750-800 is designed for direct mounting onto compatible ABB AF580 and AF750 contactors.
ABB EF750 electronic overload relays are trusted worldwide by OEM manufacturers, panel builders and industrial maintenance engineers for delivering accurate motor protection, dependable performance and long service life in demanding industrial environments.
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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...