Lovato RFE454500 is a three-pole 9–45 A electronic thermal overload relay with phase-failure protection, selectable trip classes 5, 10, 20 and 30, and manual or automatic reset for compatible BF09 to BF38 contactors.
£141.30
The Lovato RFE454500 is a three-pole electronic thermal overload relay designed to protect three-phase motors against overload and phase-failure conditions. Part of the Lovato RFE electronic overload relay series, it provides an adjustable operating current range of 9–45 A and is designed for direct mounting on compatible Lovato BF09 to BF38 contactors.
The RFE454500 is self-powered from the main circuit and does not require a separate auxiliary supply for its electronic protection function. Selectable trip classes 5, 10, 20 and 30 allow the relay to be adapted to different motor starting characteristics, while phase-failure and single-phase sensitivity provide additional protection for three-phase motor installations.
With selectable manual or automatic resetting, an integrated test button and trip indication, the RFE454500 provides flexible operation for industrial motor starters and control panels. Its power circuit supports operational voltages up to 690 V AC, while the frontal IP20 protection rating and direct BF contactor mounting make it well suited to enclosed industrial control assemblies.
Electronic overload relays protect motors by monitoring current and disconnecting the associated contactor when an overload or abnormal phase condition persists beyond the selected trip characteristic. Unlike a simple fixed protection arrangement, selectable trip classes allow the protection response to be matched more closely to the starting characteristics of different motors and driven machinery.
The Lovato RFE454500 combines a broad 9–45 A adjustment range with phase-failure detection, selectable trip classes and manual or automatic reset. Its self-powered design and direct compatibility with BF09–BF38 contactors make it a compact solution for building coordinated motor starters in industrial control panels and automation systems.
| Manufacturer | Lovato Electric |
|---|---|
| Series | RFE45 |
| Model | RFE454500 |
| Product type | Electronic thermal overload relay |
| Number of poles | 3 |
| Operational current range | 9–45 A |
| Rated operational voltage | 690 V AC |
| Rated insulation voltage | 1000 V |
| Rated impulse withstand voltage | 6 kV |
| Operational frequency | 50–60 Hz |
| Trip classes | 5, 10, 20 and 30 |
| Release type | Electronic thermal |
| Phase-failure detection | Yes |
| Reset mode | Manual or automatic |
| Test button | Yes |
| Trip indicator | Yes |
| Auxiliary contacts | 1 NO + 1 NC |
| Frontal protection rating | IP20 |
| Overvoltage category | III |
| Pollution degree | 3 |
| IEC gG protection fuse | 63 A |
| IEC aM protection fuse | 40 A |
| Main terminal type | Screw and washer, M4 |
| Main terminal tightening torque | 3.1 Nm |
| Operating temperature | -25 to +70 °C |
| Storage temperature | -55 to +80 °C |
| Maximum altitude | 3000 m |
| Mounting type | Direct mounting on BF09–BF38 contactors |
| EAN-13 | 8013975230268 |
| HS code | 85364900 |
| ETIM classification | EC001080 - Electronic overload relay |
The RFE454500 is an electronic thermal overload relay used to protect three-phase motors against overload and phase-failure conditions in industrial motor control systems.
The Lovato RFE454500 has an adjustable operational current range of 9–45 A.
The relay provides selectable trip classes 5, 10, 20 and 30, allowing its protection response to be configured for different motor starting characteristics.
Yes. The RFE454500 allows manual or automatic resetting to be selected according to the requirements of the motor control application.
The RFE454500 is designed for direct mounting on compatible Lovato BF09 to BF38 contactors and can also be used with the appropriate independent mounting accessory where required.
Lovato Electric RFE electronic overload relays are designed for coordinated use with BF contactors, providing panel builders, machine manufacturers and automation engineers with flexible electronic protection for demanding three-phase motor applications.
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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...