Contact sales Contact support. Set the switch to Ext if using PLC outputs with NPN transistors Device short name ATV Variant Standard version Product destination Asynchronous motors Synchronous motors EMC filter Integrated withm conforming to EN/IEC category C2 Integrated with m conforming to EN/IEC category C3 IP degree of protection IPconforming to IEC IPconforming to IEC [Us] rated Power dissipation in W. Natural convectionW VkHz Forced convection W VkHz. The switch is used to adapt the opera