I read that these have a surge protector for servos and just wanted to double check when connected Via Arduino to avoid return blowouts.
https://www.phidgets.com/?prodid=722
"Isolated VINT Port prevents voltage spikes on the load side from damaging the control side"
Use a VINT port with this relay to switch power to a circuit running at up to 210 watts DC or 1750 volt-amperes AC.