AGThe Bernstein AG SLK-M-NC-55-R0-A0-L0-0 is a safety switch with bolting, NC (normally-closed) and NO (normally-open) contacts, an IP67 rating, and a M20 electrical connection. This switch is designed to detect the presence of two different objects in a safety-related application, providing a signal to start, stop, or prevent the movement of a machine or system. The SLK-M-NC-55-R0-A0-L0-0 is a robust and reliable device for use in harsh industrial environments, offering a high degree of protection from dust, water, and other contaminants.