EMC-03 AC power measurement and control up to 25 Amp. With a strong relay on board it can be assigned a switch number and controlled by the Base Unit remotely.

Whenever pressing the Test button or activate the relay, EMC-03 sends out the board status and AC current reading at the moment. 

With super capacitor to backup the power, it will send AC loss/restore signal to alert the main power condition and the last reading in memory before dying.