The Siemens 3RV1901-1A is a high-quality auxiliary switch designed to provide reliable and efficient performance in a variety of industrial applications. This plug-in device features a single normally open (1NO) and a single normally closed (1NC) contact, making it versatile for different circuit configurations. With a voltage rating of 690 V ac and 220 V dc, it can handle demanding power requirements. The 3RV1901-1A is part of the SIRIUS product line, known for its robustness and durability. It's designed for lateral mounting on circuit breakers of sizes S00 to S3, offering flexibility in installation. The switch has an IP20 protection class on the front, ensuring safety in operation. Its operating temperature ranges from -20 to +60 degrees Celsius, making it suitable for use in various environmental conditions. The 3RV1901-1A auxiliary switch is a testament to Siemens' commitment to quality, innovation, and reliability in industrial automation.