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RF420420 - T/O RELAY RF420 250-420A
MPN: RF420420
Special Price
£452.23
£376.86
Regular Price
£753.72
Why Choose the RF420420?
Protect three-phase motors with the Lovato RF420420 thermal overload relay. This three-pole, phase failure/single-phase sensitive device safeguards against overloads across a wide 250...420 A operational range. Choose manual or automatic resetting to suit your control scheme, and mount securely using screw fixings. Built for demanding environments, it offers IP20 frontal protection and conforms to IEC/EN 60947 standards for dependable performance in industrial motor control panels.
Engineered for reliability, the relay provides a rated insulation voltage Ui of 1000 V and a 6 kV impulse withstand (Uimp), with Pollution Degree 3 resilience. It operates from -25 to 60 °C and integrates seamlessly with Lovato B series contactors. Terminals accept a specified 35 Nm tightening torque, while the 3-pole, 2460 g construction supports straightforward installation in motor starters, MCCs and switchboards requiring consistent motor protection.
Key Benefits
- Wide 250...420 A operational range for high-current motor protection.
- Phase failure/single-phase sensitive to detect unbalanced supply conditions.
- Manual or automatic reset to suit different control strategies.
- Three-pole design optimised for three-phase motor circuits.
- IP20 frontal protection enhances safety in control panels.
- High insulation ratings: Ui 1000 V, Uimp 6 kV.
- Screw mounting for secure, straightforward installation.
- Compliant with IEC/EN 60947 and North American 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 RF420420 thermal overload relay
- Manufacturer datasheet/installation instructions
- Protective packaging
Applications
- Three-phase motor protection in industrial control panels
- Motor starters using Lovato B series contactors
- Pumps, fans and conveyors within 250...420 A load range
- MCCs and switchboards requiring phase-failure detection
Frequently Asked Questions
What is the operational current range?
The RF420420 is rated for 250...420 A operational current.
Does it detect phase failure or single-phase conditions?
Yes, it is phase failure/single-phase sensitive for enhanced motor protection.
What reset modes are available?
It offers manual or automatic resetting to suit the application.
What is the frontal IP rating?
The frontal protection rating is IP20.
Which standards does it comply with?
It conforms to IEC/EN 60947-1 and 60947-4-1, plus UL508 and CSA C22.2 n° 14.
Safety note: Installation and settings should be performed by qualified personnel. Verify coordination with the 250...420 A range, environmental ratings, and B series contactors, and always isolate power before work.
| Manufacturer Part Number | RF420420 |
|---|---|
| Manufacturer | Lovato |
| HS Code | 85364900 |
| Barcode | 8013975169445 |
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