The Siemens 3RF2440-1AC35 is a solid state Relay that is rated for 110VAC Ucntrl, 40A, 48 to 600VAC and 3-phase. The unit is housed in a DIN mount and is an ideal choice for applications in motor driven machinery, pumps, ventilation systems, transformers and more. The unit is designed to turn on and off loads quickly and efficiently preventing damage from long-term operation at high currents. Additionally, the relay features precise control and low power consumption.