Overview
The Allen-Bradley 1771-WHFB /A is a fused field wiring arm engineered for PLC-5 industrial automation systems. This component provides secure, protected field wiring interconnections between 1771 I/O modules and plant-level electrical devices. The integral fuse protection on each output channel ensures equipment safety and simplifies troubleshooting in production environments.
Key Features
- 21 tin-plated terminals for corrosion resistance and reliable contact
- Individual 1.5A fuses on all output channels (250V rated)
- Designed specifically for PLC-5 16-point I/O module compatibility
- Thermoplastic construction with conformal coating for moisture and corrosion protection
- Tool-free terminal connections for fast field installation
Technical Specifications
- Product Type: Fused Field Wiring Arm
- Terminal Count: 21 terminals
- Fuse Rating: 1.5A per channel, 250V
- Terminal Material: Tin-plated copper
- Housing Material: Thermoplastic with conformal coating
- Dimensions: 6 x 6 x 2 inches
- Weight: 1 pound (0.45 kg)
- I/O Points: 16
- Manufacturer: Allen-Bradley / Rockwell Automation
- Series: PLC-5 1771
- Condition: New in Box
Typical Applications
The 1771-WHFB /A field wiring arm is commonly used in:
- Manufacturing and assembly line control systems
- Packaging machinery automation
- Process control installations requiring distributed I/O protection
- Retrofit and upgrade projects on existing PLC-5 platforms
- Food and beverage production facilities requiring fused field distribution
- Industrial facilities where per-channel fuse isolation is mandatory
Compatibility & Replacements
Compatible With
- Allen-Bradley 1771 output modules (OBD, OAD series and equivalents)
- 1771-A1B through 1771-A4B I/O chassis (except 1771-A4)
- PLC-5 controllers and networked PLC-5 systems
- Standard 22–14 AWG solid or stranded copper field wiring
Replaces / Drop-In Replacement For
- Older or damaged 1771-WHFB units (any revision)
- Direct replacement within existing PLC-5 wiring harness installations
- Verify module keying (10–12 / 22–24) matches your output module before ordering
Works With
- Rockwell Automation RSLogix platforms for PLC-5 programming
- Allen-Bradley 1771 I/O module series and backplane systems
- Standard industrial DC relay and solenoid control circuits
- Plant-level control wiring up to 250V AC/DC applications
