Allen-Bradley 1794-TB3TS Terminal Base Unit

The 1794-TB3TS is a terminal base unit from Allen-Bradley’s Flex I/O 1794 series. It supports temperature modules and connects multiple modules through its backplane. The unit uses spring-clamp terminals for quick and reliable wiring. You can mount it on a DIN rail or a wall panel. It operates safely up to 125V AC/DC and carries currents up to 10 Amps. Additionally, it features cold-junction compensation (CJC) for temperature accuracy. The unit fits wiring categories 2, 3, and 4, ensuring broad compatibility.

Technical Specifications

• Manufacturer: Rockwell Automation
• Brand: Allen-Bradley
• Part Number: 1794-TB3TS
• Product Type: Flex I/O Terminal Base Unit
• Voltage Rating: 24V DC/AC, 120V DC/AC, max 125V AC/DC
• Maximum Current: 10 Amps at 50–60 Hz
• I/O Connection Capacity: 16 terminals
• Common Terminals: 10
• Voltage (+V) Terminals: 4
• Chassis Ground Terminals: 8
• Cold-Junction Compensation Sets: 2
• FLEXBUS Current: 640 mA at 5V DC
• I/O Terminal Max Current: 2 Amps
• Isolation Voltage: 125V continuous between field terminals and FLEXBUS
• Wire Size Range: 22–12 AWG (0.34–3.3 mm²)
• Terminal Screw Torque: 0.56–0.79 Nm
• Mounting Method: DIN rail or wall/panel mount
• Enclosure Type: Open-style, IP20 rated
• Operating Temperature Range: -20°C to 70°C (-4°F to 158°F)
• Relative Humidity: 5–95% without condensation
• Temperature Codes: T4A and T4 (max 135°C)
• Dimensions: 94 mm x 94 mm x 69 mm (3.7 in x 3.7 in x 2.7 in)
• Weight: 0.65 kg