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RFN420300 - T/O RELAY 180-300A MAN-AUTO
MPN: RFN420300
Special Price
£435.06
£362.55
Regular Price
£725.10
Why Choose the RFN420300?
Engineered for robust motor protection, the Lovato RFN420300 thermal overload relay safeguards three-phase installations across a wide 180–300 A range. The RFN420300 offers manual or automatic reset, a three‑pole design and screw mounting for straightforward integration. Non phase failure/non single‑phase sensitive operation suits applications where conventional phase-loss tripping is not required, and compatibility with Series B contactors streamlines panel standardisation.
Built to recognised standards, this relay carries IP20 frontal protection, Ui 1000 V and Uimp 6 kV, with pollution degree 3 for industrial environments. Operating from −25 to 60 °C and up to 3000 m altitude, it provides reliable service parameters. It conforms to IEC/EN 60947-1 and 60947-4-1, plus UL508 and CSA C22.2 n° 14.
Key Benefits
- Wide 180–300 A adjustable range for heavy-duty three-phase motors.
- Manual or automatic reset for fast recovery and flexible maintenance.
- Three-pole design ensures dependable protection of three-phase circuits.
- Screw mounting enables quick, secure installation in control panels.
- IP20 frontal protection enhances operator safety during handling and checks.
- High insulation ratings: Ui 1000 V and Uimp 6 kV.
- Conforms to IEC/EN 60947, UL508 and CSA standards.
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 RFN420300 thermal overload relay unit
- Installation and operation guide
- Manufacturer’s datasheet (downloadable)
Applications
- Three-phase motor protection in the 180–300 A range
- Industrial control panels and motor control centres using Series B contactors
- Pumps, fans, compressors and conveyors in heavy-duty environments
- OEM machinery requiring adjustable thermal overload protection
Frequently Asked Questions
What current range does the RFN420300 cover?
It offers an operational current range of 180...300 A.
Can it be reset automatically?
Yes, the relay supports manual or automatic resetting.
Is it sensitive to phase loss?
No. It is non phase failure/non single-phase sensitive.
What protection and insulation ratings does it have?
It features IP20 frontal protection, Ui 1000 V and Uimp 6 kV.
Which standards does it conform to?
It conforms to IEC/EN 60947-1, IEC/EN 60947-4-1, UL508 and CSA C22.2 n° 14.
Safety note: Install and commission by qualified personnel. Isolate power before work, set the 180–300 A range correctly, operate within specified temperatures, and follow applicable standards and site procedures.
| Manufacturer Part Number | RFN420300 |
|---|---|
| Manufacturer | Lovato |
| Barcode | 8013975169162 |
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