Allen Bradley 1794-TB3 | 125V AC/DC Flex I/O Mounting Base

Availability: 20 left in stock

Product Overview The Allen Bradley 1794-TB3 serves as the essential mounting and wiring foundation for the Flex I/O system. This terminal base...

SKU: 1794-TB3

Manufacturer: Allen Bradley
Product No.: 1794-TB3
Product Type: Terminal Base Units
Product Origin: USA
Payment:T/T, Western Union
Weight: 260g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Product Overview

The Allen Bradley 1794-TB3 serves as the essential mounting and wiring foundation for the Flex I/O system. This terminal base unit provides the physical interface and electrical connection point for 1794 I/O modules, enabling seamless communication with the FLEXBus backplane. Designed with a 3-wire cage-clamp termination system, the 1794-TB3 streamlines field wiring for sensors and actuators. We supply this unit as 100% Brand New and Original, ensuring high-integrity signal routing and robust power distribution for distributed control architectures in automotive, water treatment, and material handling industries.

Technical Specifications

Parameter	Details
Manufacturer	Allen Bradley (Rockwell Automation)
Model Number	1794-TB3
Product Line	Flex I/O
Termination Type	Cage-Clamp (3-Wire)
FLEXBus Voltage/Current	5V DC, 640 mA
V/COM Terminal Voltage	125V AC/DC (Maximum)
V/COM Current Capacity	10 Amps
Terminal Screw Torque	0.56 to 0.79 Nm (5 to 7 lb-in)
Isolation Voltage	125 Volts (Continuous)
Operating Temperature	-20 °C to +70 °C (-4 °F to 158 °F)
Mounting	Horizontal or Vertical DIN Rail
Weight	0.26 kg (0.56 lbs)

Engineering Advantages

Simplified 3-Wire Termination: The 1794-TB3 features a specialized 3-wire cage-clamp design. This allows engineers to terminate the signal, power (V), and common (COM) wires directly on the base for each I/O point, eliminating the need for external terminal strips and reducing cabinet clutter.
Modular "Hot Swap" Capability: The terminal base remains stationary while the I/O module plugs into the center. This design allows for "Removal and Insertion Under Power" (RIUP), meaning maintenance teams can replace a faulty I/O module without disconnecting field wiring or shutting down the entire system bus.
High-Voltage Versatility: Unlike standard low-voltage bases, the 1794-TB3 supports up to 125V AC/DC on the V/COM terminals. This enables the integration of higher voltage field devices—such as 120V AC solenoids or relay coils—directly into the Flex I/O assembly.
Space-Saving DIN Rail Integration: The compact form factor and integrated DIN rail latching mechanism allow for high-density mounting. The base unit creates the backplane connection automatically when slid alongside adjacent units, significantly reducing assembly time during cabinet builds.

FAQs

What is the benefit of the Cage-Clamp over standard Screw-Terminals?

The cage-clamp system in the 1794-TB3 provides a constant spring-force connection. Unlike traditional screws that can loosen over time due to machine vibration, the cage-clamp maintains a secure, gas-tight seal on the wire, significantly reducing long-term maintenance requirements.

Does the 1794-TB3 come with the I/O module?

No. The 1794-TB3 is a standalone terminal base unit. You must purchase the specific Flex I/O module (e.g., 1794-IB16 or 1794-OB16) separately. This modularity allows you to mix and match different I/O types on the same base platform.

Can I use the 1794-TB3 for analog modules?

While the 1794-TB3 is primarily used for digital I/O due to its 3-wire layout, some analog modules are compatible. However, for high-precision analog signals requiring shielded twisted pairs, we recommend checking the specific 1794 analog module's manual to ensure the TB3 provides sufficient grounding points.

What size wire does the cage-clamp accommodate?

The 1794-TB3 cage-clamps typically accept wire sizes ranging from 0.34 $$mm^2$$ to 2.5 $$mm^2$$ (22 to 12 AWG) solid or stranded copper wire, providing flexibility for various industrial wiring standards.

What's clients say about us

Excellent Emergency Support!

Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.

Mark Thompson

Maintenance Manager, USA

Reliable Source for New Spares

Finding brand new, original modules is critical for our safety. This team delivers factory-fresh components with full certification. Their commitment to only selling new products makes them our most trusted partner.

Robert Hoffmann

Engineering Lead, Germany

Top-tier Service and Quality

We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.