Lovato RF420300 is a three-pole Class 10A thermal overload motor protection relay with a 180-300 A operational current range and manual or automatic resetting.
£641.62
The Lovato RF420300 is a high-capacity three-pole thermal overload motor protection relay designed to protect industrial three-phase motors against overload conditions. Part of the Lovato RF420 motor protection relay series, it provides an adjustable operational current range of 180–300 A for demanding motor control applications.
The RF420300 features a Class 10A thermal release, manual or automatic resetting, integrated test button and trip indicator. Designed for high-current motor protection systems, it supports reliable operation and straightforward maintenance in industrial electrical installations.
With a rated operational voltage of 690 V, rated insulation voltage of 1000 V and IP20 frontal protection, the RF420300 is suitable for large motor starters and industrial control panels. Its screw fixing arrangement and auxiliary contacts provide flexible installation and control integration.
Thermal overload relays protect motors by monitoring current levels and responding when sustained overload conditions occur. The Lovato RF420300 provides adjustable high-current protection for large three-phase motors used in industrial equipment and electrical installations.
With manual or automatic resetting, integrated testing facilities and auxiliary contacts, the RF420300 supports dependable motor starter operation while simplifying maintenance and fault identification.
| HS Code | 85364900 |
|---|---|
| Manufacturer | Lovato Electric |
| Series | RF420 |
| Model | RF420300 |
| Product type | Thermal overload motor protection relay |
| Number of poles | 3 |
| Release type | Thermal |
| Operational current | 180–300 A |
| Rated operational voltage | 690 V |
| Rated insulation voltage Ui | 1000 V |
| Rated impulse withstand voltage Uimp | 6 kV |
| Operational frequency | 50–60 Hz |
| Tripping class | 10A |
| Phase failure detection | No |
| Reset mode | Manual or automatic |
| Test button | Yes |
| Trip indicator | Yes |
| Auxiliary contacts | 1 NO + 1 NC |
| Frontal protection rating | IP20 |
| Fixing type | Screw fixing |
| Power terminal screw | M10 |
| Operating temperature | -25–60 °C |
| Storage temperature | -50–70 °C |
| Maximum altitude | 3000 m |
| Weight | 2460 g |
The RF420300 is a three-pole thermal overload motor protection relay designed to protect high-current three-phase motors against overload conditions.
The RF420300 has an adjustable operational current range of 180–300 A.
The Lovato RF420300 has a Class 10A tripping characteristic.
Yes. The RF420300 supports both manual and automatic resetting.
Yes. The relay includes 1 NO and 1 NC auxiliary contacts for control and signalling applications.
The Lovato RF420300 provides high-current thermal overload protection, flexible resetting and integrated control features for reliable motor protection in demanding industrial 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...