RF420300 - T/O RELAY RF420 180-300A

Why Choose the RF420300?

The Lovato RF420300 thermal overload relay delivers dependable motor protection for heavy-duty three-phase applications. With phase failure/single-phase sensitivity, this three-pole unit safeguards against overload conditions across a wide 180–300 A operating range. SKU RF420300 supports manual or automatic resetting to suit maintenance preferences, and mounts via secure screw fixings for straightforward integration alongside Lovato B series contactors in industrial control panels.

Designed for reliability, this relay features IP20 frontal protection and robust insulation performance rated Ui 1000 V with 6 kV impulse withstand. Suited to Pollution Degree 3 environments and operation from -25 to 60 °C up to 3000 m altitude, it aligns with IEC/EN 60947-1 and 60947-4-1, UL508 and CSA C22.2 n° 14, supporting compliance in demanding UK industrial motor protection duties.

Key Benefits

• 180–300 A operational range protects high-current three-phase motors.
• Phase failure/single-phase sensitive for enhanced motor safety and uptime.
• Manual or automatic reset options to match site maintenance practices.
• Three-pole design suits standard three-phase motor circuits.
• IP20 frontal protection improves safety during panel access.
• Ui 1000 V and 6 kV impulse withstand for robust insulation.
• Screw mounting enables secure, straightforward installation.
• Compatible with Lovato B series contactors.

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 RF420300 thermal overload relay
• Installation and operation leaflet
• Manufacturer datasheet (downloadable)
• Protective packaging for safe transit

Applications

• Three-phase motor protection in industrial control panels
• Overload and phase-failure protection for high-current motors (180–300 A)
• Integration with Lovato B series contactors
• Equipment operating in Pollution Degree 3 environments
• Panels requiring IP20 frontal protection

Safety note: Install and commission only by qualified personnel. Always isolate power before wiring, setting, or maintenance, and follow applicable standards and product documentation.