RF420250 - T/O RELAY RF420 150-250A

Why Choose the RF420250?

Lovato’s RF420250 is a three-pole thermal overload relay designed for robust motor protection. Phase failure and single-phase sensitive, it safeguards three-phase installations across 150...250 A. Choose manual or automatic resetting to suit your control strategy. Engineered for screw mounting and compatibility with B series contactors, it offers reliable protection in demanding industrial panels.

Built for durability, this relay features a 1000 V rated insulation voltage and 6 kV impulse withstand, with IP20 frontal protection and pollution degree 3. Operating from -25 to 60 °C up to 3000 m altitude, it delivers dependable performance. Conforming to IEC/EN 60947-1 and 60947-4-1, plus UL508 and CSA C22.2 n° 14, it fits rigorous compliance needs.

Key Benefits

• Phase failure and single-phase sensitive protection for three-phase motors.
• Wide 150...250 A operational current range for varied loads.
• Manual or automatic reset to suit control preferences.
• Three-pole design enhances motor overload safety.
• IP20 frontal protection and pollution degree 3 robustness.
• Rated insulation 1000 V and 6 kV impulse withstand.
• Screw mounting, compatible with 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 RF420250 thermal overload relay
• User manual and installation guide
• Manufacturer datasheet
• Protective packaging

Applications

• Three-phase motor protection in industrial control panels
• Machinery and manufacturing lines requiring overload protection
• HVAC and pump stations using B series contactor assemblies
• Material handling and conveyor systems
• General-purpose motor circuits within specified current range

Safety note: Installation and adjustment should be performed by qualified personnel. Always isolate power before work and set the trip current within the 150...250 A range to match the motor.