The ESPE SSR21 Series Contactless Safety Door Switch is a contactless safety interlock designed to detect the open/closed status of safety doors, movable guards, or protective covers without requiring physical contact between the sensor and actuator. It uses RFID technology for secure and reliable detection and supports both universal coding and unique coding between sensor and actuator to prevent tampering or unintended match‑ups. This design provides higher safety integrity compared to traditional mechanical switches by eliminating wear points and improving long‑term reliability.
The SSR21 Series complies with ISO 13849‑1 and IEC/EN 60947‑5‑3 safety standards and features dual redundant safety outputs with self‑diagnosis and cross‑diagnosis to reduce potential hazards from single‑loop failures. Its compact IP65‑rated housing suits installation on machine guards, safety cage doors, and access points in automation environments where basic safety door monitoring is required.
