Allen-Bradley 1797-TB3 Terminal Base Module Screw Clamp

The Allen-Bradley 1797-TB3 FLEX Ex I/O terminal base module provides screw-clamp termination and is designed to accept FLEX Ex plug-in I/O modules, delivering intrinsically safe operation for use in hazardous locations while integrating with the broader FLEX Ex I/O family and its modular backplane architecture. In this base, 36 wiring connections are available to connect field wiring to the plug‑in module, enabling dense, organized terminations and clear separation between wiring and module circuits, which facilitates neat panel layouts and simplified troubleshooting. The 1797-TB3 is the screw-clamp terminal base, while the 1797-TB3S is the spring-clamp variant, with the installation instructions explicitly calling these two base models out by termination style. As part of the FLEX Ex I/O infrastructure, this base unit is used to route I/O signals from intrinsic safety modules to field devices, enabling safe, scalable automation in hazardous environments.