Specification Supply voltage: 24 V dc ● Number of channels: 2 ● Auxiliary contact: NC ● Function: Emergency stop ● Safety category ISO 13849-1: 4 ● SIL IEC61508: 3 ● Performance level ISO 13849-1: e ● Safety contact: 3 NO ● Range: PNOZsigma ● Reset method: automatic, manual, with monitoring ● Terminal type: screw ● Width: 22.5mm ● EN 60947-5-1, EN 60204-1 VDE 0113-1. PNOZ Sigma 4 by PILZ. The PNOZ Sigma Known for their reliability and durability, PILZ safety relays offer you second to none safety protection features to ensure you and your workplace stay safe.