1794-TB3K |Allen Bradley | FLEX I/O Conformal Coated Screw-Clamp Terminal Base

Product Overview

The Allen Bradley 1794-TB3K serves as the critical mounting and wiring interface for the FLEX I/O system. This terminal base provides the physical housing and backplane connection for I/O modules, facilitating the distribution of signals from field devices to the industrial network. Featuring a conformal coating, the 1794-TB3K withstands aggressive atmospheric conditions that would otherwise compromise standard electronic assemblies. We offer this unit as 100% Brand New original factory stock, ensuring a pristine, uncompromised connection for your distributed I/O architecture.

Technical Specifications

Engineering Advantages

• Corrosion Resistance in Harsh Zones: The factory-applied conformal coating shields the internal circuitry and contact points from moisture, salt spray, and corrosive chemical vapors. This hardware-level protection prevents trace oxidation and intermittent signal loss in pulp and paper mills, refineries, and wastewater treatment facilities.

• Simplified 3-Wire Sensor Integration: The 1794-TB3K provides 18 common terminals and 18 voltage terminals. This expanded capacity allows engineers to wire 3-wire sensors (power, return, and signal) directly to the base without utilizing external terminal strips or jumper blocks, significantly reducing cabinet wiring complexity.

• Screw-Clamp Physical Security: The high-torque screw-clamp design ensures a gas-tight electrical connection. Unlike spring-style terminals in high-vibration environments, these mechanical clamps prevent wire pull-out and maintain constant contact pressure over years of thermal cycling.

• Modular Maintenance Efficiency: The terminal base remains stationary on the DIN rail during module replacements. Technicians swap the plug-in I/O modules without disconnecting any field wiring, which drastically lowers the Mean Time To Repair (MTTR) and eliminates the risk of rewiring errors during emergency maintenance.

FAQs

• Can the 1794-TB3K replace a standard 1794-TB3 unit?

  Yes. The 1794-TB3K is the "K" (conformal coated) version of the 1794-TB3. It shares the same footprint and electrical characteristics, making it a superior drop-in replacement for any application requiring 3-wire screw-clamp termination.

• What mounting precautions should I follow for the 1794-TB3K?

  Always snap the base firmly onto a grounded 35mm DIN rail. Ensure you engage the side-locking tabs with the adjacent terminal base to maintain the integrity of the FLEXbus communication backplane.

• Is this product factory sealed?

  Yes. We guarantee this 1794-TB3K is 100% Brand New. It arrives in the original manufacturer’s packaging with all factory seals intact. We do not provide refurbished or used surplus components.

• How many modules can I connect in a single FLEX I/O row?

  While the terminal base supports a single module, the FLEXbus allows you to daisy-chain up to eight terminal bases per I/O adapter. Ensure your power supply provides sufficient current for the total count of modules and sensors attached to the stack.