WAGO I/O System 750/753 Item no. 750-666/000-004 Fail-safe 4/2 channel digital input/output; 24 VDC; 10 A; PROFIsafe Item no. 750-666/000-004 Fail-safe 4/2 channel digital input/output Generate Datasheet Download Downloads as zip Download Compare Configure Item no. 750-666/000-004 Fail-safe 4/2 channel digital input/output Generate Datasheet Download Downloads as zip Download Compare Configure