We use cookies to make your experience better. To comply with the new e-Privacy directive, we need to ask for your consent to set the cookies. Learn more.
RFN420250 - T/O RELAY 150-250A MAN-AUTO
MPN: RFN420250
Special Price
£423.34
£352.78
Regular Price
£705.55
Why Choose the RFN420250?
Engineered for demanding motor circuits, the Lovato RFN420250 thermal overload relay safeguards three-phase equipment across a wide 150...250 A operational range. This three-pole device offers manual or automatic resetting, and features a non phase failure / non single-phase sensitive design. Optimised for screw mounting and integration with B series contactors, it provides dependable motor protection in industrial control panels and switchgear assemblies.
Built to international standards, this Lovato thermal overload relay carries IP20 frontal protection, Pollution Degree 3, Ui 1000 V and 6 kV impulse withstand. It operates from −25 to 60 °C and up to 3000 m altitude, with robust construction for harsh environments. Conformance includes IEC/EN 60947-1 and 60947-4-1, plus UL508 and CSA C22.2 n° 14 for global panel compliance.
Key Benefits
- Wide operational current range of 150...250 A for heavy-duty motors.
- Manual or automatic reset options to suit different protection strategies.
- Three-pole design tailored for three-phase motor applications.
- Compatible with B series contactors for straightforward panel integration.
- IP20 frontal protection and Pollution Degree 3 for safer operation.
- Ui 1000 V and 6 kV Uimp support robust insulation performance.
- Operates from −25 to 60 °C and up to 3000 m altitude.
- Screw mounting simplifies secure installation in control panels.
Technical Specification
- Number of poles: 3
- Pollution degree: 3
- IP degree (frontal): IP20
- Rated insulation voltage Ui (IEC/EN): 1000 V
- Rated impulse withstand voltage Uimp: 6 kV
- Terminal tightening torque: 35 to 35 Nm
- Ith (IEC): 10 A
- Operating temperature: -25 to 60 °C
- Storage temperature: -50 to 70 °C
- Max altitude: 3000 m
- Weight: 2460 g
What’s Included
- Lovato RFN420250 thermal overload relay
- Quick start installation guide
- Manufacturer datasheet (download link)
- Warranty information
Applications
- Three-phase motor protection in industrial control panels and switchgear
- Pumps, fans and compressors within the 150...250 A current range
- Conveyors and material handling systems requiring thermal overload protection
- HVAC and process equipment in compliant control cabinets
Frequently Asked Questions
What is the operational current range of the Lovato RFN420250?
The relay covers 150...250 A operational current.
Is the RFN420250 suitable for three-phase motors?
Yes. It is a three-pole (three-phase) thermal overload relay.
What reset modes does this relay support?
It provides manual or automatic resetting.
Is this relay phase-failure sensitive?
No. It is non phase failure / non single-phase sensitive.
Which contactor series is this relay designed for?
It is designed for B series contactors.
Safety note: Install and set the relay only by qualified personnel. Always isolate power before wiring or adjustment and ensure settings match the motor’s full-load current and application.
| Manufacturer Part Number | RFN420250 |
|---|---|
| Manufacturer | Lovato |
| Barcode | 8013975169001 |
Write Your Own Review
