DEK opto-isolated interface terminals from Phoenix Contact are just 6.2mm
wide, yet they are capable of switching up to 10A at 24Vdc with a maximum
operating frequency of 100Hz (FET output version). An economical triac
output version is available for switching 0.8A at any ac voltage between
10 and 235V (50 or 60Hz). All models have 2.5kV isolation between input
and output circuits, and the ac models provide zero voltage switching.