The AR30PR-211B is a 2-position maintained selector switch with a round bezel and knob operator, featuring 1NO+1NC (1 normally open + 1 normally closed) contact arrangement. The switch operates with maintained action, meaning it holds its position when rotated and does not spring back. It is constructed with oil-and dust-proof operator module design conforming to IEC Standard IP65, providing protection against oil, dust, and grime in harsh industrial environments. The selector switch is available with screw terminals and can be configured with or without a transformer for various voltage applications ranging from 5.5V AC/DC to 500-550V AC. This compact design makes it suitable for control applications in manufacturing, process automation, and industrial machinery where reliable position selection and contact switching are required.