WAGO I/O System 750/753 Item no. 753-666/000-003 Fail-safe 4/2 channel digital input/output; 24 VDC; 10 A; PROFIsafe V2.0 iPar Item no. 753-666/000-003 Fail-safe 4/2 channel digital input/output Discontinued Downloads as zip Download Compare Configure Item no. 753-666/000-003 Fail-safe 4/2 channel digital input/output Discontinued Downloads as zip Download Compare Configure