Guardmaster 440K

Guardmaster 440K is Allen-Bradley's family of tongue interlock safety switches designed to monitor the position of machine guards, light curtain muting arms, and access doors in safety-rated control applications. The 440K catalog number encodes the switch platform and contact configuration: the T prefix identifies tongue-actuated interlocks, followed by a model designator (T15, Trojan 5, Trojan 6) and a multi-digit suffix that specifies contact arrangement, entry direction, head style, and connector type — for example, 440K-T11320 is a Trojan T15 with 2 N.C. safety contacts and no special features, while 440K-T11463 adds a GD2 metal head and dual N.C. safety contacts, and 440K-T11406 is a Trojan 6 configured with 3 N.C. safety contacts. Contact arrangements across the family range from 1 N.C. to 3 N.C. safety circuits, with optional auxiliary N.O. outputs and quick-disconnect or conduit terminations. Accessory catalog numbers such as 440K-A17180 cover dust covers compatible with Trojan/MT GD2 heads. For full contact ratings, actuator dimensions, and safety performance data, consult the Guardmaster 440K Technical Data (Switch-TD001).