PZE X4VP, Expansion Module, Time Delayed Category 4 to EN954-1 Contact expansion for use with safety relays Resets with base unit LED status indication Screw terminals DIN rail mounting Note All base units must have a feedback control loop Approvals BG, UL listed for Canada and US Standards EN954-1, IEC / EN60204-1 Approvals BG, UL listed for Canada and US Standards EN954-1, IEC / EN60204-1