Crydom ez240d12 compact solid state relays panel mount crydom ez240d18 a compact 18a solid state relay with a 24 to 280v ac operating voltage and a 3 to 15v dc control voltage designed for low profile applications and with an scr output suitable for heavy industrial loads crydom ez240d18 solid state relay 280vrms 18a max 3 15vdc control voltage