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Cross-Reference · Square D

Square D LA — Replacement & Cross-Reference

The Square D LA is a discontinued L-frame molded-case breaker rated to 600 A, widely used as a feeder and MCC main. The current path is the PowerPact L-frame (LD / LG / LJ / LL), chosen by interrupting rating. LAL / LH / LC denote higher-interrupting versions of the same frame. Edmundson Industrial sources new-surplus, used-tested, and reconditioned LA-frame breakers, including the common LA36400.

Status

BrandSquare D / Schneider Electric
FrameL-frame (LA, with LAL / LH / LC AIC tiers)
Amp rangeto 600 A (nominal — confirm on nameplate)
Poles2, 3
Voltage240 / 480 / 600 VAC by catalog code
InterruptingLA standard, LAL / LH / LC higher AIC — verify at quote
Current replacementPowerPact L-frame (LD / LG / LJ / LL)
Example catalogsLA36400 (3-pole, 600 V, 400 A), LA36350, LAL36600 — confirm on nameplate

Cross-Reference

If you have (obsolete)Recommended pathNotes
LA (standard AIC)PowerPact LD / LG by amp & AICMatch the interrupting rating to the available fault current.
LAL / LH / LC (higher AIC)PowerPact LJ / LLHigher-interrupting tiers — keep the AIC at or above the original.
Keep the panel as-builtNew-surplus / used-tested LA (we source)True drop-in. Match poles, voltage, amp, and AIC on the full catalog string.
Switchboard / MCC mainLike-for-like surplusAvoids reworking 400–600 A bus, lugs, and cable terminations.

Cross-references are starting points — confirm interrupting rating, poles, voltage, trip type, lug size, and mounting before substituting. Send the catalog number and we'll verify the match.

Key Specs (frame overview)

Is the Square D LA still made?

No. The LA frame is discontinued; the PowerPact L-frame is the current equivalent. LA36400 is one of the most-searched obsolete Square D numbers and a steady mover on the surplus market — it's the top industrial molded-case breaker by search in our demand data. Because a 400–600 A breaker is built into the switchboard's bus and lugs, a surplus LA drop-in almost always beats reworking the gear, and we keep the PowerPact path ready for a planned upgrade.

FAQ

Is the Square D LA breaker discontinued?
Yes — the LA frame is discontinued. New-surplus, used-tested, and reconditioned units remain available through Edmundson Industrial.
What replaces a Square D LA breaker?
The PowerPact L-frame (LD / LG / LJ / LL), selected by amp and interrupting rating. Higher-AIC LAL / LH / LC map to LJ / LL. We also source original LA surplus.
Can you source an LA36400?
Yes — LA36400 (3-pole, 600 V, 400 A) is a common, actively traded surplus number. Send the exact string and we'll quote new-surplus, used-tested, or reconditioned with condition disclosed.
Should I retrofit or drop in a surplus LA?
For a 400–600 A main built into a switchboard's bus and lugs, a surplus drop-in usually avoids costly gear rework. Retrofit to PowerPact at a planned upgrade.
Will a PowerPact L-frame fit my LA switchboard?
Sometimes; lug and mounting details change. Our fabrication side builds adapter plates and lug/bus hardware so the current breaker fits the legacy opening.

Availability & Quote

Condition always disclosed before sale — new-surplus, used-tested, or reconditioned — with photos on request.

Request a Quote

or send the catalog number to sales@edmundsonindustrial.com · (832) 975-8827 · Houston, TX. Same-day response on most requests.

Related Square D pages

Send the catalog number off the breaker.

Condition disclosed before sale. Same-day response on most requests.

Request a Quote