Shelly Pro 3EM Switch Add-on

The galvanic isolation gives me real peace of mind when switching my contactor, and the wiring terminals are laid out clearly enough that I finished the install in under twenty minutes. Works flawlessly with my existing setup.

Wired this up to control my contactor and it worked flawlessly on the first try—the galvanic isolation gives me real peace of mind with the higher voltages. Setup took maybe ten minutes and it's been rock-solid since.

The galvanic isolation on this add-on gives me real peace of mind when wiring up my contactors—no more worrying about stray voltages messing with the meter. Setup took about ten minutes, and now I’ve got clean, reliable switching without any hiccups.