SQUARE D
SQUARE D AL400LA Mechanical Lug 600 kcmil 1 Conductor Tin-Plated Aluminum
Connects a single 600 kcmil conductor with tin-plated aluminum body rated for 600 V and 221 °F
- Handles up to 600 kcmil conductors
- Tin-plated aluminium resists corrosion
- Accepts both aluminium and copper wire
- Rated for 600 V maximum voltage
- Withstands 221 °F operating temperature
SQUARE D AL400LA Mechanical Lug
The SQUARE D AL400LA is a tin-plated aluminum mechanical lug rated for a single conductor up to 600 kcmil. It accepts stranded copper wire from 1 AWG to 250 kcmil and aluminum conductors within the same range. The connector mounts on a 1/4 inch stud with a hex socket head and operates at up to 600 volts. It suits panel builders and electricians terminating large feeder cables in industrial or commercial equipment.
Upgrade from smaller lugs
This lug replaces lower-ampacity connectors when a single 250 kcmil copper or aluminum conductor must be terminated at 600 volts. The jump is justified when the existing lug cannot accommodate the required wire size or the 221 degrees F temperature rating. It is not for applications needing multi-conductor termination, higher voltage classes, or conductors larger than 250 kcmil copper.
Capacity and headroom
The lug handles one conductor at the maximum 250 kcmil copper size with a 600-volt rating and 221 degrees F operating limit. The single-hole mounting on 0.34 inch diameter with 0.88 inch spacing fits standard 1/4 inch stud patterns. It runs out when the design calls for more than one conductor per phase, voltages above 600 V, or wire sizes exceeding the 250 kcmil copper maximum.
Highlights
- Handles up to 600 kcmil conductors
- Tin-plated aluminium resists corrosion
- Accepts both aluminium and copper wire
- Rated for 600 V maximum voltage
- Withstands 221 °F operating temperature
Specifications
| Brand | SQUARE D |
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Questions about this item
What stud size and hole spacing does the AL400LA lug require for mounting?
The lug mounts on a 1/4 in stud with a single 0.34 in diameter hole and 0.88 in hole spacing.
Which conductor sizes and materials are accepted, and what is the correct torque procedure?
It accepts one aluminum or copper conductor from 1 AWG to 600 kcmil (250 kcmil max for stranded copper); tighten the hex-socket set screw to the manufacturer's specified torque.
How often should the tin-plated aluminum body and connection be inspected?
Inspect the lug and conductor connection periodically for discoloration, corrosion or overheating signs, especially when operating near the 221 °F temperature limit.
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