Why Choose the Lovato RF420250 Motor Protection Relay?
The Lovato RF420250 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 150–250 A for demanding motor control applications.
The RF420250 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 RF420250 is suitable for large motor starters and industrial control panels. Its screw fixing arrangement and auxiliary contacts provide flexible installation and control integration.
Key Advantages
- 150–250 A adjustable operational current range for high-current motor protection.
- Three-pole thermal overload relay for three-phase motor applications.
- Class 10A tripping characteristic for reliable motor overload protection.
- Selectable manual or automatic reset for flexible operation.
- Integrated test button and trip indicator simplify commissioning and maintenance.
- 1NO + 1NC auxiliary contacts for control and signalling circuits.
Key Features
- Lovato RF420 motor protection relay series.
- 150–250 A operational current range.
- 690 V rated operational voltage.
- 1000 V rated insulation voltage Ui.
- 6 kV rated impulse withstand voltage Uimp.
- Class 10A thermal overload protection.
- IP20 frontal protection rating.
- Manual or automatic resetting.
- Integrated test button and trip indication.
- 1NO + 1NC auxiliary contacts.
Reliable Thermal Overload Protection for Industrial Motors
Thermal overload relays protect motors by monitoring current levels and responding when sustained overload conditions occur. The Lovato RF420250 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 RF420250 supports dependable motor starter operation while simplifying maintenance and fault identification.
Typical Applications
- Large three-phase industrial motor protection.
- Motor starters and motor control centres.
- Industrial machinery and production equipment.
- Pumps, fans and heavy-duty drive systems.
- Electrical control panels and switchgear.
- Industrial automation and process equipment.
