Guardmaster 440C

The Allen-Bradley Guardmaster 440C is a configurable safety relay platform designed for machine safety applications requiring high-integrity control without a dedicated safety PLC. The catalog number structure follows a logical pattern: 440C identifies the Guardmaster configurable relay bulletin, CR30 denotes the base relay model, and the trailing characters (e.g., 22BBB) encode I/O count and configuration options — in this case, 22 safety I/O points. The flagship unit in this family, the 440C-CR30-22BBB, is software-configured and rated to PLe / SIL 3, the highest functional safety performance levels under ISO 13849 and IEC 62061. Connectivity can be extended via the 440C-ENET Ethernet plug-in module, which installs in Slot 1 only and enables network integration over EtherNet/IP — an open industrial protocol — for diagnostics and status monitoring. Together, these two products cover the core hardware and communication needs for a Guardmaster 440C safety relay installation.