Euchner CET-AP is a safety switch with door lock function and security monitoring of the door lock. It has built-in CES-AP electronics. It does not require a special evaluation unit. When installed horizontally or head down, comply with Safety Category 4 of EN ISO 13849-1 and PL e. It is equipped with two secure semiconductor outputs and monitor outputs. The security output uses pulses. Optional inputs can be used to connect the feedback loop and the start button.