Omron D4N-8C20 is a safety limit switch with a roller-lever actuator, one normally-closed and one normally-open contact rated 10 A, and two M20 cable entries. The metal housing and positive-opening contacts suit machine-guarding applications governed by EN ISO 13849 category requirements. Typical service is door and guard interlocking on industrial machinery, conveyors and process equipment where a mechanically actuated position switch is specified.