This Harmony ZB, LED suppressor is supplied with 230Vac and uses screw-clamp terminals.It is compatible with Harmony XB4 and XB5 light blocks with integral LED.This LED suppressor is designed to be used in conjunction with LED block to prevent a premature failure of your device when it exposes to high voltage.It protects operators from unexpected contact with live circuits thanks to its IP20 protection index.Vibration resistant screw clamp connection terminals ensure high vibration resistance making product suitable installation on high impact machine.