Allen Bradley 1794-TB3 | FLEX I/O 3-Strip Screw-Clamp Terminal Base

Product Description

The Allen Bradley 1794-TB3 is a FLEX I/O terminal base unit designed to provide secure wiring connections for FLEX I/O modules. With three terminal strips and screw-clamp connections, it supports up to 52 terminals, including dedicated I/O, common, and supply terminals. The 1794-TB3 is engineered for modular wiring flexibility, supporting daisy-chaining and offering robust isolation for reliable integration into distributed automation systems.

Technical Specifications

• Manufacturer Allen Bradley

• Product Line FLEX I/O 1794 Series

• Product Type Terminal Base Unit

• Part Number 1794-TB3

• Weight 0.56 lbs (0.26 kg)

• Terminal Screw Torque 0.56–0.79 Nm

• Supply Voltage Range (Max) 125 V AC/DC, 50/60 Hz, 10 A

• Voltage Ratings 24 V AC/DC, 120 V AC/DC, 132 V AC max

• Isolation Voltage 125 V continuous

• No. of Terminal Strips 3

• No. of Terminals 52 total

• Terminal Strip Assignment

• Top: I/O terminals

• Middle: Common terminals

• Bottom: Supply terminals

• Terminal Row Assignments

• Row 1: 16 terminals (I/O)

• Row 2: 18 terminals (common)

• Row 3: 18 terminals (supply)

• Wire Size Supported 0.34–3.3 mm² (22–12 AWG)

• Insulation Thickness 1.2 mm (3/64 in.)

• Connection Type Screw-clamp

• Daisy-Chaining Supported

• Backplane Current Draw 640 mA @ 5 V DC

• FlexBus Current Draw 640 mA @ 5 V DC

• Current Rating 10 A

• Channel Isolation Module-based

• Installation DIN rail mount

• UNSPSC 32151602

Application Scenarios

• FLEX I/O distributed systems requiring high-density terminal bases

• Machine-level automation with modular wiring needs

• Industrial environments needing daisy-chained wiring and robust isolation

FAQ

Q: How many terminals does the 1794-TB3 provide?  A: 52 terminals across three strips (I/O, common, supply).

Q: What type of connection does the 1794-TB3 use?  A: Screw-clamp connections for secure wiring.

Q: Is daisy-chaining supported?  A: Yes, the 1794-TB3 supports daisy-chaining.

Comparable Models

• 1794-TB3: 3-strip screw-clamp terminal base (this model)

• 1794-TBN: Single-strip screw-clamp terminal base

• 1794-TBNF: Dual-strip screw-clamp terminal base