RFA823300 - OVERLOAD RELAY 20-33A BF40-BF80 AUTO

Why Choose the RFA823300?

Protect three-phase motors reliably with the Lovato RFA823300 thermal overload relay. This three-pole, phase failure/single‑phase sensitive motor protection relay covers 20–33 A and features automatic resetting for fast recovery after trips. Designed for direct mounting on BF40 to BF94 contactors, it streamlines panel assembly and wiring while delivering dependable overload and phase-loss protection.

Engineered for demanding environments, it offers Ui 690 V and 8 kV impulse withstand, with IP20 frontal protection and pollution degree 3. Rated for -20 to 55 °C operation up to 3000 m altitude, it meets IEC/EN 60947-1 and 60947-4-1, plus UL508 and CSA standards. A compact 365 g unit, it provides robust protection in industrial control panels and OEM machinery.

Key Benefits

• Phase failure/single‑phase sensitive for reliable motor loss-of-phase protection.
• Adjustable 20–33 A range suits varied three-phase motor ratings.
• Automatic resetting minimises downtime after resolved overload events.
• Direct mounting on BF40–BF94 contactors saves space and wiring.
• Three-pole design integrates seamlessly with standard motor starters.
• Rated Ui 690 V with 8 kV impulse withstand for robustness.
• IP20 frontal protection and pollution degree 3 enhance safety.
• Complies with IEC/EN, UL508 and CSA standards for confidence.

Technical Specification

• Number of poles: 3
• Pollution degree: 3
• IP degree (frontal): IP20
• Rated insulation voltage Ui (IEC/EN): 690 V
• Rated impulse withstand voltage Uimp: 8 kV
• Terminal tightening torque: 3.9 to 3.9 Nm
• Ith (IEC): 10 A
• Operating temperature: -20 to 55 °C
• Storage temperature: -55 to 80 °C
• Max altitude: 3000 m
• Weight: 365 g

What’s Included

• Lovato RFA823300 thermal overload relay
• Direct-mount unit for BF40–BF94 contactors
• Quick start guide and safety information

Applications

• Protection of three-phase motors within 20–33 A range
• Pumps, fans, compressors and conveyor drives
• OEM machinery using BF-series motor starters
• Industrial control panels and automation systems
• HVAC and building services motor circuits

Safety note: Install and commission only by qualified personnel. Always isolate power before work, set protection to the motor’s rated current, and operate within the specified ratings and standards.