Allen Bradley 1492-JG3 Ground Terminal Block

Allen Bradley 1492-JG3 Ground Terminal Block

The Allen Bradley 1492‑JG3, also cataloged as the 1492‑JG3 grounding terminal block, operates as a one‑circuit feed‑through earth‑ground termination device for DIN‑rail mounted industrial control panels.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks

Ground terminal blocks in Allen Bradley control panels contribute to stable reference potentials for PLC and network modules. Proper earth‑ground continuity reduces noise coupling into Profinet and EtherNet/IP deterministic networks, preventing transient disturbances on shielded twisted‑pair cabling. The mechanical stability of the 35 mm DIN rail mount supports consistent grounding performance under vibration.

Frequently Asked Questions

Q: Can the terminal block accept both solid and stranded conductors? A: Yes. The screw‑clamp design supports 24 AWG to 12 AWG conductors.

Q: Is the block intended for protective earth only? A: Yes. The green/yellow housing indicates PE grounding per IEC conventions.

Q: Does the terminal block require any special DIN rail type? A: No. It mounts on standard 35 mm DIN rail.

Field Installation Guidelines

• Ensure the DIN rail itself is bonded to the cabinet’s protective earth.
• Tighten screw connections to manufacturer torque recommendations to prevent loosening under vibration.
• Maintain conductor insulation clearances to avoid accidental contact with adjacent terminals.
• Route grounding conductors separately from high‑frequency signal wiring to reduce noise coupling.
• Verify continuity from the terminal block to the main earth bar after installation.