The SPMP4P40 with Module: mains-generator switch is a device manufactured by Spamel that is designed to switch between a mains power supply and a generator power supply. It has 4 poles and an insulation rating of IP20 for added protection. This switch has a voltage rating of 240/415VAC and a current rating of 40A. It is used in a variety of applications, including industrial motors, water pumps, and HVAC systems.