Why Choose the Lovato RFE454500 Electronic Overload Relay?
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.
Key Advantages
- Wide 9–45 A adjustable operating current range for three-phase motor protection.
- Electronic thermal overload protection with high flexibility for industrial motor starters.
- Phase-failure and single-phase sensitive protection.
- Selectable trip classes 5, 10, 20 and 30 for different motor starting conditions.
- Manual or automatic reset selectable to suit the control application.
- Self-powered from the main circuit, eliminating the need for a separate auxiliary supply for the protection electronics.
Key Features
- Lovato RFE45 electronic overload relay series.
- 9–45 A operational current adjustment range.
- Three-pole, three-phase design.
- 690 V AC rated operational voltage.
- 1000 V rated insulation voltage.
- 6 kV rated impulse withstand voltage.
- Selectable trip classes 5, 10, 20 and 30.
- Integrated phase-failure detection.
- Selectable manual or automatic reset.
- Integrated test button and trip indicator.
- 1 NO + 1 NC auxiliary contacts.
- Direct mounting on compatible BF09–BF38 contactors.
Reliable Electronic Motor Protection for Industrial Systems
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.
Typical Applications
- Three-phase industrial motor starters.
- Pumps, fans and ventilation equipment.
- Conveyors and material handling systems.
- Compressors and processing machinery.
- Motor control centres and industrial control panels.
- OEM machinery and automated production equipment.
