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ABB ef750-800 electronic overload relay 250a – 800a
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.
£779.36
Why Choose the ABB EF750-800 Electronic Overload Relay?
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.
Key Advantages
- Accurate electronic overload protection for high-power three-phase motors.
- Adjustable current range of 250-800 A.
- Selectable Trip Class 10E, 20E and 30E.
- Protects against motor overload and phase failure.
- Self-powered design requiring no external control supply.
- Direct mounting onto compatible ABB AF580 and AF750 contactors.
Key Features
- ABB EF750 electronic overload relay series.
- Current adjustment: 250-800 A.
- Rated operational current: 800 A.
- Selectable Trip Classes 10E / 20E / 30E.
- 1 NO + 1 NC auxiliary contacts.
- Automatic or manual reset selection.
- Integrated STOP, TEST and trip indication.
- ATEX and IECEx certified for approved applications.
Reliable Motor Protection for Heavy Industrial Applications
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.
Typical Applications
- Heavy-duty conveyor systems.
- Mining and quarry equipment.
- Large industrial pumps and compressors.
- Steel and process manufacturing plants.
- Industrial motor control centres.
- High-power automation and process control systems.
Technical Specifications
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| Mounting Type | Direct mount on contactor | |
|---|---|---|
| Current Range | 250–800 A | |
| Trip Class | Adjustable (5–30) | |
| Reset Type | Manual / Automatic | |
| Device Type | Electronic Overload Relay | |
| Current | 800 A | |
| Phase | Three Phase | |
| IP Rating | IP20 | |
| Poles | 3-pole | |
| 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 |
Frequently Asked Questions
What is the ABB EF750-800 used for?
The EF750-800 protects large three-phase electric motors against overload, phase failure and overheating in heavy industrial motor control applications.
What current range does this overload relay support?
The relay provides an adjustable protection range from 250 A to 800 A.
Does the EF750-800 require an external power supply?
No. The relay is self-powered and operates without an additional external control supply.
Which trip classes are available?
The relay supports selectable Trip Class 10E, 20E and 30E for different motor starting requirements.
Which contactors is this relay compatible with?
The EF750-800 is designed for direct mounting onto compatible ABB AF580 and AF750 contactors.
Trusted by Industrial Control Professionals
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.
