Product Overview

The Allen Bradley 1756-TBE functions as an extended depth terminal block housing, mechanical end barrier, and protective enclosure designed explicitly for ControlLogix 1756 Removable Terminal Blocks (RTBs). This heavy-duty plastic cover accessory snaps directly onto 1756-TBNH (screw-clamp) and 1756-TBSH (spring-clamp) 20-pin terminal blocks to insulate bare wire terminations and manage complex wire bundles. By enclosing the wire connection points, it creates a physical shield that prevents accidental physical contact with energized circuits while maintaining uniform component spacing inside high-density control enclosures. We deliver this structural accessory exclusively as a 100% brand-new, original product inside its original factory box to ensure a flawless snap-lock fit and complete adherence to industrial safety regulations.

Technical Specifications

Engineering Advantages

• Establishes True Touch-Safe Enclosure Metrics: Exposed copper wiring terminals invite phase-to-phase shorts and shock hazards during diagnostic panel checks. This non-conductive barrier encloses all bare wire inputs, providing reliable physical insulation that achieves an IP20-style touch-safe interface for plant-floor technicians.

• Allows Clean Management of Thick Wire Bundles: High-density I/O configurations often require heavy-gauge wiring or thick insulation sleeves that overfill standard termination spaces. The extended depth cavity provides ample internal space, allowing engineers to route and dress large wire bundles neatly without crimping or straining individual wire terminal seats.

• Prevents Horizontal Thermal Cross-Talk: Packing active digital and analog cards closely together inside a multi-slot chassis creates localized thermal pockets. This rigid polymer barrier maintains standard physical clearances between adjacent terminal assemblies, promoting proper convection airflow paths across high-heat components.

• Accelerates Retrofits with Toolless Snapping Assemblies: The housing features precision-molded alignment slots and integrated structural latch tabs. Installation takes seconds: field technicians press the housing directly onto the wired 1756-TBNH or 1756-TBSH block until the lock clips snap shut, eliminating the need for mounting screws or hand tools.

FAQs

• Does the 1756-TBE package include the actual electrical 20-pin terminal block mechanism?

  No. The 1756-TBE constitutes a completely non-electronic, hollow plastic protective shroud. It does not include internal metal contacts, terminal blocks, or wire screws. You must purchase your required operational terminal blocks (such as the 1756-TBNH screw-clamp or 1756-TBSH spring-clamp terminal units) separately to complete your module wiring.

• Can I mount this housing onto any legacy or third-party PLC terminal block?

  No. Allen Bradley designs this housing exclusively to fit the exact geometric footprint and mechanical latching points of the ControlLogix 1756 I/O product line. It will not align with or snap onto SLC 500, Point I/O, Flex I/O, or alternative third-party manufacturer terminal blocks.

• Is it necessary to remove this cover to swing open the I/O module door?

  No. The 1756-TBE maintains a compact, low-profile outer envelope that aligns perfectly with standard ControlLogix chassis clearances. The housing swings outward smoothly alongside the standard module door assembly, allowing complete access for wire layout tracking without requiring you to un-snap the barrier shroud.