Siemens XMS-501 Conventional Pull StationThe Siemens XMS 501 is a conventional dual action manual pull station for use on supervised initiating device circuits (IDCs). It features a high impact polycarbonate housing, Siemens T 45 key for quick, secure reset, and a familiar dual action Lift & Pull operation. As a dry contact device, it interfaces directly with conventional IDC zones. Also known as P N S54321 F16 A1. Model Variants: XMS S Addressable single action with isolation XMS D