Panduit A4/0-56RF-C Pan-Lug Compression Lug

The Panduit A4/0-56RF-C Pan-Lug compression lug delivers military-spec pullout strength and UL-listed reliability for 4/0 AWG battery cables in UPS rooms, backup power systems, and critical infrastructure installations. Tin-plated to ASTM Class C standards, this 90° right-angle lug resists corrosion in battery-room environments where sulfuric acid vapor and humidity degrade unprotected copper. The sealed barrel design—built without an inspection window—keeps contaminants out of the crimp zone, maintaining connection integrity across the 10–15 year service life typical of standby battery banks.

Key Features

• 4/0 AWG conductor capacity handles 200–400A battery interconnects and DC power distribution
• 5/16" stud hole fits standard battery terminal posts and bus bar hardware
• 90° bend provides clearance in tight battery racks and terminal-block installations
• Tin-plated copper barrel meets ASTM Class C corrosion resistance for wet-location and battery-room use
• Sealed barrel without inspection window prevents moisture, dust, and acid vapor intrusion
• Flared barrel entry eases insertion of stranded flex conductors during field crimping
• cULus listed to UL 486A-486B for 600V power applications in US and Canada
• Meets US Military wire pullout specifications when installed with Panduit-recommended crimping tools
• 100-piece packaging supports multi-string battery banks and large UPS installations

Battery-room connections fail from two mechanisms: corrosion and crimp pullout. The A4/0-56RF-C addresses both. Tin plating creates a sacrificial barrier against the sulfuric acid mist and hydrogen off-gassing present in flooded lead-acid and VRLA battery environments, extending connection life beyond what bare copper delivers. The closed barrel—manufactured without the inspection window found on some competitive lugs—eliminates a contamination path; battery-room humidity can't condense inside the crimp, and airborne acid can't creep between conductor strands. For pullout strength, Panduit specifies this lug meets military wire-termination standards (MIL-DTL-83528) when crimped with Panduit CT-series tools, delivering the mechanical hold required for seismic zones and mobile installations where vibration would loosen inferior crimps.

The 90° offset geometry solves a common battery-rack problem: straight lugs put bending stress on the conductor at the crimp transition when cables route horizontally from vertical battery terminals. This lug's factory-formed right angle eliminates that stress point, keeping flex at the terminal post rather than the crimp barrel. The 5/16" stud hole is the industry standard for commercial battery terminals from Trojan, C&D, EnerSys, and others; it also fits #10-32 bus bar hardware and grounding studs in switchgear. Overall length of 1.65" provides enough barrel length for full 4/0 conductor insertion while keeping the assembly compact enough for the 2" terminal spacing common in 2V cell battery strings.

This lug is cULus listed under UL 486A (wire connectors) and 486B (splicing connectors) for use up to 600V in both United States and Canada, meeting NEC and CEC requirements for permanent power installations. It carries UPC 061305679314 and ships in 100-piece packages, sized for a 50-cell 48VDC battery string with two lugs per interconnect cable (100 lugs = 50 cables). Panduit recommends pairing this lug with the CT-2010 or CT-3001K crimping tool and following the crimp-depth specifications in installation guide CG-PLRFA to achieve rated pullout strength and UL compliance.