Description
The Allen-Bradley 1756-TBCH, 1756-TBNH, 1756-TBSH, and 1756-TBS6H are Removable Terminal Block (RTB) modules for the ControlLogix series I/O modules. These high-quality terminal blocks provide the critical interface between field wiring and the I/O module’s electronic circuits. The TBCH and TBNH are screw-type terminal blocks (36-pin and 20-pin respectively), offering robust, vibration-resistant connections. The TBSH and TBS6H are spring-clamp terminal blocks (20-pin and 36-pin respectively), enabling tool-less wiring for faster installation. Designed for easy snap-on mounting to corresponding I/O modules, they ensure reliable signal and power transmission in demanding industrial automation environments.
Key Features
- Removable Terminal Block (RTB) for ControlLogix I/O modules
- Terminal Types: Screw-clamp (TBCH, TBNH) and Spring-clamp (TBS6H, TBSH)
- Pin Counts: 36-pin (TBCH, TBS6H) for high-density/analog modules; 20-pin (TBNH, TBSH) for standard digital modules
- Connection: Easy snap-on to 1756 I/O module front
- Wiring: Accepts 14-22 AWG wire (screw type) or 16-22 AWG (spring type)
- Material: High-quality thermoplastic
- Country of Origin: USA (Allen-Bradley)
Technical Specifications
Parameter | 1756-TBNH (20-Pin Screw) | 1756-TBSH (20-Pin Spring) | 1756-TBCH (36-Pin Screw) | 1756-TBS6H (36-Pin Spring) |
|---|---|---|---|---|
Catalog Number | 1756-TBNH | 1756-TBSH | 1756-TBCH | 1756-TBS6H |
Terminal Type | Screw Clamp | Spring Clamp | Screw Clamp | Spring Clamp |
Number of Terminals | 20 | 20 | 36 | 36 |
Wire Size (Solid/Stranded) | 14-22 AWG (2.1-0.33 mm²) | 16-22 AWG (1.3-0.33 mm²) | 14-22 AWG (2.1-0.33 mm²) | 16-22 AWG (1.3-0.33 mm²) |
Max. Wire Size (2 wires) | 16 AWG (1.3 mm²) | 16 AWG (1.3 mm²) | 16 AWG (1.3 mm²) | 16 AWG (1.3 mm²) |
Tightening Torque (Screw) | 0.5 N·m (4.4 lb-in) | N/A | 0.5 N·m (4.4 lb-in) | N/A |
Compatible I/O Module Width | 20-pin (e.g., 1756-IB16, -OB16) | 20-pin (e.g., 1756-IB16, -OB16) | 36-pin (e.g., 1756-IF8, -OF8) | 36-pin (e.g., 1756-IF8, -OF8) |
Dimensions | Approx. 76mm x 20mm x 40mm | Approx. 76mm x 20mm x 40mm | Approx. 76mm x 36mm x 40mm | Approx. 76mm x 36mm x 40mm |
Color | Black | Black | Black | Black |
Standards | UL, CSA, CE, RoHS compliant | UL, CSA, CE, RoHS compliant | UL, CSA, CE, RoHS compliant | UL, CSA, CE, RoHS compliant |
Warranty & After-Sales
- Factory new units: 12 months warranty (Allen-Bradley Original)
- Refurbished units: 3-6 months warranty (Tested for continuity and mechanical fit)
- Technical support for identifying the correct RTB for your specific 1756 I/O module (e.g., 1756-IF8 requires TBCH/TBS6H, not TBNH).
- Wiring best practices guidance (e.g., proper ferrules for stranded wire, torque settings).
- Compatibility verification with your existing ControlLogix rack setup.
Delivery Time
- Standard delivery: 3-5 working days
- Express shipping available for urgent system commissioning.
Why Choose Our Store
- Genuine Rockwell Automation Components: We supply only authentic 1756 series parts.
- System Expertise: We understand the ControlLogix platform and can help you avoid common mismatches (e.g., 20-pin vs. 36-pin).
- Global Stock: Multiple warehouses ensure fast delivery to your panel shop or plant.
Applications
- New Control Panel Build: Adding terminal blocks to new 1756 I/O modules for a ControlLogix system.
- Maintenance/Replacement: Replacing a damaged or lost terminal block on an existing module in the field.
- System Expansion: Adding new I/O points to an existing rack, requiring additional terminal blocks.
- Retrofit/Upgrade: Standardizing wiring interfaces during a system upgrade.
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