The Mercator Ikuü dimmer switch mechanism (SSWM-DIM) requires a valid dimmable load to be connected for it to function correctly. It is required to calibrate the automatic power gauging function to the connected dimmable lights. SSWM10-WIFI can be used as a standalone switch with no load, or with a low (<5W) load. SSWM-DIM is not to be connected directly to neutral.