Pilz 750104 Safety Relay PNOZ S4 24VDC 3N O 1N C

The PILZ 750104 PNOZ S4 safety relay is a 24 V DC monitoring device designed for industrial safety control systems to supervise emergency stop circuits and safety devices. This DIN-rail mounted, electromechanical relay provides three normally open safety contacts and one normally closed auxiliary contact, with a response time under 50 milliseconds and a safety category rating up to Cat 4 under EN ISO 13849-1. Its compact housing is about 22.5 mm wide and uses screw terminals; it operates from -10°C to +55°C with IP20 protection and is specified for EN 60947-5-1, EN ISO 13849-1, and IEC 62061. Typically installed on packaging lines, conveyors, presses, robotic cells, and automated production lines to protect operators and support safety circuit protection, upgrades, or replacement of faulty relays; common replacements include PILZ 750330 PNOZ S30, Siemens 3SK1111, and Schneider Electric XPSAC5121.