1756-TBNH ControlLogix 20-Pin Screw Terminal Block RTB | Allen-Bradley

The Original New Allen-Bradley 1756-TBNH is a 20-position removable terminal block (RTB) designed for ControlLogix 1756 I/O modules. It provides a flexible, secure interconnection between field wiring and 1756 I/O modules via NEMA screw‑clamp terminals. The removable design allows the entire terminal block to be disconnected without disturbing individual wire terminations, significantly reducing downtime during module replacement or troubleshooting. Must be ordered separately from the I/O module.

Core Engineering Highlights:
20-position NEMA screw-clamp terminal block | 1.36 Nm (12 in-lb) screw torque | Single wire: 22–14 AWG (0.33–2.1 mm²) | Double wire: 22–16 AWG (0.33–1.3 mm²) | 8 mm (5/16 in) max screwdriver width | 0–60°C operating temperature | 0.14 kg (0.3 lb) weight

Key Features:

• Original New Allen-Bradley 1756-TBNH terminal block

• 20-position NEMA screw-clamp design for secure, vibration-resistant connections

• Removable design enables pre-wiring and module replacement without rewiring

• Corrosion-resistant stainless steel screw clamps

• Compatible with most 1756 ControlLogix I/O modules requiring 20-position termination

• Supports single or dual conductor wiring per terminal

• Color-coded wiring labels reduce installation errors

• UL Listed, CE marked, RoHS compliant

Applications:

• Field wiring termination for ControlLogix 1756 I/O modules

• Analog input/output modules requiring 20-pin RTB (e.g., 1756-IF6I, 1756-IT6I, 1756-IV16)

• Digital and specialty I/O module interconnection

• ControlLogix chassis-based automation systems

• Process control, manufacturing execution, and machine automation

Technical Specifications:

• Catalog Number: 1756-TBNH

• Product Type: Removable Terminal Block (RTB)

• Number of Positions: 20

• Terminal Type: NEMA screw-clamp

• Screw Torque: 1.36 Nm (12 in-lb)

• Maximum Screwdriver Width: 8 mm (5/16 in.)

• Single Wire Size: 0.33–2.1 mm² (22–14 AWG) solid or stranded copper, rated 105°C

• Double Wire Size: 0.33–1.3 mm² (22–16 AWG) solid or stranded copper

• Max Wire Insulation: 1.2 mm (3/64 in.)

• Recommended Strip Length: 7–8 mm (0.28–0.31 in.)

• Dimensions (L x W x H): 5.51 x 4.41 x 5.71 in. (140 x 112 x 145 mm)

• Weight: 0.3 lbs (0.14 kg)

• Compatible Controllers: 5580 Standard and Safety series

• Operating Temperature: 0°C to 60°C (32°F to 140°F)

• Storage Temperature: –40°C to 85°C

• Relative Humidity: 5% to 95% non-condensing

• Mounting: Direct attachment to 1756 I/O modules

• Country of Origin: Mexico

• Certifications: UL Listed, CE marked, RoHS compliant

System Compatibility:

• Rockwell Automation ControlLogix 1756 I/O modules requiring 20-pin RTB

• Compatible with most 1756 analog, digital, and specialty I/O modules

• 1756 ControlLogix chassis (all series)

• 1756 Power supplies

Related Products:

• 1756-TBSH – 20-pin spring-clamp terminal block (alternative termination)

• 1756-TBCH – 36-pin screw-clamp terminal block

• 1756-TBS6H – 36-pin spring-clamp terminal block

• 1756-IF16 – 16-channel analog input module

• 1756-PA72 / 1756-PA75 – ControlLogix AC power supplies

PLC ERA is an independent industrial automation distributor supplying 100% genuine Original New products through established global supply channels. Allen-Bradley and ControlLogix are trademarks of Rockwell Automation.