Siemens 3RF2 Series Solid State Relay, 20 A Load, DIN Rail Mount, 460 V Load, 30V Control

This solid state contactor is a single-pole device designed for AC switching in industrial control systems. It utilises MOSFET output stages with zero-cross switching to manage single-phase loads up to 20A within an AC operating range of 48-460V and delivers Rapid on/off response suitable for frequent switching. The unit mounts on standard 35mm DIN rail and provides finger-safe access from the front for panel installation in factory, machine control and process environments.

• 20A rated current reduces heat in continuous AC-1 applications
• Zero-cross switching minimises inrush and electromagnetic disturbance
• MOSFET output gives low off-state leakage for safer standby
• 4 to 30V control range allows low-voltage drive from PLC outputs
• IP20 protection enables safe front access in enclosed panels

• Suitable for heater and resistive element switching in machinery
• Used with PLCs for automated single-phase load control
• Ideal for Compact control panels requiring space-saving devices
• Can be used for frequent switching in packaging lines
• Suitable for retrofit of electro-mechanical contactors to solid state

At 4V control input the device typically draws 18mA.

Rated current applies up to 40°C

Solid or stranded conductors from 1.5…6mm² can be connected for the main contacts.

It fits 35mm mounting rails and can be screw-fixed for side-by-side mounting.