Allen-Bradley 1756-TBNH ControlLogix 20-Position NEMA Screw Clamp Removable Terminal Block

Product Overview

The 1756-TBNH functions as a heavy-duty Removable Terminal Block (RTB) designed specifically for the Allen-Bradley ControlLogix I/O platform. This 20-position NEMA screw-clamp connector provides the essential interface between field wiring and 1756 I/O modules. It allows technicians to wire the system independently of the modules, facilitating rapid hardware replacement and commissioning. We supply this unit as 100% Brand New original stock, ensuring secure electrical contact and long-term durability for your control cabinet.

Technical Specifications

The 1756-TBNH accommodates a wide range of industrial wiring standards:

• Number of Positions: 20 Positions

• Termination Type: NEMA Screw Clamp

• Wire Size Range: 22 to 14 AWG

• Wire Material: Solid or Stranded Copper Wire

• Conductor Capacity: Maximum 2 conductors per terminal

• Screw Torque: 1.36 Nm (12 lb-in)

• Wiring Temperature Rating: 90°C (194°F) or higher

• Screwdriver Compatibility: 8 mm maximum width

• Weight: 0.25 lbs (0.11 kg)

• Compatibility: 1756 ControlLogix I/O Modules

Engineering Advantages

• Streamlined Hardware Maintenance: The removable design eliminates the need to disconnect individual field wires during module replacement. Technicians simply unplug the 1756-TBNH from the faulty module and seat it onto the new unit, reducing Mean Time to Repair (MTTR) from hours to seconds.

• Robust NEMA Screw Clamping: The NEMA-style screw clamps provide high mechanical retention force. This design prevents wire pull-out in high-vibration environments, solving the common problem of intermittent signal loss in heavy industrial applications.

• High-Density Wiring Support: By supporting up to two conductors per terminal within a 22 to 14 AWG range, this RTB allows for efficient commoning of power or ground signals directly at the terminal interface. This minimizes the requirement for external distribution blocks and reduces cabinet clutter.

• Superior Thermal Rating: The 90°C temperature rating ensures the terminal block maintains its structural and electrical integrity in high-current or high-ambient temperature environments, such as those found in motor control centers or thermal processing plants.

FAQs

• Is the 1756-TBNH supplied as a brand new original part?

  Yes. We provide this RTB exclusively as 100% Brand New original stock. It arrives in its original factory condition to guarantee precise alignment and secure latching with your ControlLogix I/O modules.

• Does this terminal block support both solid and stranded wire?

  Yes. The 1756-TBNH utilizes a versatile screw-clamp mechanism that securely grips both solid and stranded copper wire. We recommend using ferrules for stranded wire to ensure maximum contact surface area and prevent fraying.

• Can I use the 1756-TBNH with any 1756 I/O module?

  The 1756-TBNH is compatible with most 1756 I/O modules that utilize a 20-position interface. However, always check the specific module’s manual, as some high-density modules require 36-pin terminal blocks (like the 1756-TBCH).

• What is the correct torque setting for the terminal screws?

  To ensure a gas-tight connection and prevent terminal damage, apply exactly 1.36 Nm (12 lb-in) of torque. Over-tightening may strip the screw threads, while under-tightening can lead to resistive heating and potential fire hazards.