Panel Mount Solid State Relays- HDC Series. The H16WD series from Crydom offers a panel mounting solid state relay with current ratings of 120A to 160A @ 72 Vdc. These solid state relays are designed for control of high power DC loads such as coils, clutches, motors, and solenoids and can be used in a variety of applications including packaging, machinery, power supplies and process controls. The HDC series of solid state contactors are housed in a compact, robust industry standard 75x105mm panel mount package and are suited to harsh environments. Single pole single throw normally open operation LED status Indicator Heavy duty stud terminals Low on-state voltage drop