Manufacturer part nos. ending in -10 are random turn on. Panel Mount Solid State Relays - H16WD Series. The H16WD series from Crydom offers a panel mounting solid state relay with current ratings of 25A to 90A @ 48-660 Vac These solid state relays offer higher levels of breakdown voltage and noise immunity for applications exposed to high voltage surge conditions. Hockey puck style casing 1600 volt blocking SCR output for heavy industrial loads Zero-crossing (resistive loads) or random-fire (inductive loads) output LED indicator Operating temperature -40 80 °C