The Pilz PNOZ s4 C (312043) is a high-performance safety relay designed for monitoring critical safety functions such as E-STOP pushbuttons, safety gates, and light barriers. Part of the compact PNOZsigma series, this unit offers maximum safety in a narrow 17.5 mm housing, saving valuable cabinet space. It operates on a 24V DC supply and provides three normally open safety contacts and one normally closed auxiliary contact. The ‘C’ designation indicates a conformally coated version, making it robust and reliable for use in harsh or corrosive environments. With pluggable screw terminals, installation and maintenance are simplified. This relay meets the highest safety standards, including PL e (Cat. 4) of EN ISO 13849-1 and SIL CL 3 of IEC 62061, ensuring optimal protection for both personnel and machinery.