The Omron D4B-2171N is a high-quality safety limit switch designed for robust performance in demanding industrial environments. Part of the D4B-N series, this switch features a rugged die-cast metal housing that ensures durability and a long operational life. It is equipped with a direct opening mechanism, a critical safety feature that guarantees the normally closed (NC) contacts are forced open when the actuator is operated, making it ideal for safety circuits in machinery guarding applications. The roller lever actuator provides reliable and precise position detection. With an IP67 rating, this switch offers superior protection against dust and water ingress, ensuring reliable operation even in harsh conditions.