Allen-Bradley 1794-TB3K Flex I/O Terminal Base

Series#: AllenBradley

Product Details

1794-TB3K – Allen-Bradley Conformal Coated 3-Wire Screw Terminal Base for Flex I/O systems.
Designed for harsh environments with conformal coating for enhanced resistance to moisture, dust, and vibration.
Supports 3-wire field device connections (sensors, actuators) with a single screw terminal block per point.
Direct replacement for standard 1794-TB3 in corrosive or washdown applications.
Simple plug-in mounting onto Flex I/O adapter or communication module backplane.
Rated for 24V DC control signals and up to 2A per point (limited by module).
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Specification

The Allen-Bradley 1794-TB3K is a conformal coated 3-wire screw terminal base unit specifically engineered for the Flex I/O family. This robust terminal base provides a reliable interface between field wiring and I/O modules in environments where standard components may fail due to condensation, chemical exposure, or high humidity. The conformal coating process adds a protective layer to the PCB and solder joints, ensuring long-term durability in critical industrial applications. The 1794-TB3K accepts up to 16 points of 3-wire connections (e.g., 2-wire sensors with shield, or 3-wire proximity switches) and uses a single screw clamp per point for secure wiring. It is fully compatible with all Flex I/O analog, digital, and specialty modules, and mounts directly onto the backplane without additional hardware.

Parameter	Specification
Manufacturer	Allen-Bradley (Rockwell Automation)
Product Type	3-Wire Screw Terminal Base
Model	1794-TB3K
Coating	Conformal Coated (per IPC-CC-830)
Number of Points	16
Wire Connection	Screw clamp per terminal
Wire Size	0.5 mm² to 2.5 mm² (22–14 AWG)
Rated Voltage	24V DC nominal (max 30V DC)
Current per Point	2 A (limited by I/O module)
Total Current Rating	8 A (bus limited)
Environmental Protection	Conformal coating for humidity, salt spray, and chemical resistance
Operating Temperature	-20°C to +60°C
Storage Temperature	-40°C to +85°C
Relative Humidity	5% to 95% non-condensing
Mounting	Plug-in onto Flex I/O backplane (1794 series)
Compatible Modules	All Flex I/O analog, digital, and specialty modules
Field Wiring	3-wire (signal +, signal -, shield/ground)
Terminal Type	Screw clamp with captive screws
Torque	0.5–0.6 Nm (4.4–5.3 lb-in)
Dimensions (H x W x D)	Approx. 87 x 94 x 51 mm (3.43 x 3.70 x 2.01 in)
Weight	Approx. 120 g (0.26 lb)
Certifications	UL, CE, CSA, ATEX (when used with appropriate modules)
Standards	IEC 61131-2, NEMA ICS 4