SICK ES21-SA10D1 Photoelectric Sensor for Industrial Automation

The SICK ES21-SA10D1 is a panel‑mount safety switch from the ES21 family designed for industrial automation and machine guarding. It combines a mounted pushbutton with a switching element configured for two positive-opening normally closed contacts (part number 6036146; Type ES21‑SA10D1) and includes jam protection with unlock by turning for servicing. This two‑NC variant is designed for safety interlock circuits and is typically wired to safety relays or safety PLCs to generate safe‑stop signals when a guard is opened or the actuator is released. The ES21 family is commonly used to guard access to hazardous equipment while meeting safety standards in manufacturing environments, with a compact panel‑mount form factor that supports integration into control enclosures.