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Cross-Reference · Square D

Square D MA / MH — Replacement & Cross-Reference

The Square D MA and MH are discontinued large-frame molded-case breakers used as mains and large feeders, rated to roughly 800 A (confirm on the nameplate). The current path is the PowerPact M-frame, stepping to the P-frame at the top of the range, selected by interrupting rating. Edmundson Industrial sources new-surplus, used-tested, and reconditioned MA / MH breakers to keep switchboards and MCC mains in service.

Status

BrandSquare D / Schneider Electric
FrameM-frame (MA standard, MH / MHL higher AIC)
Amp rangelarge frame, to ~800 A (nominal — confirm on nameplate)
Poles2, 3
Voltage240 / 480 / 600 VAC by catalog code
InterruptingMA standard, MH / MHL higher AIC — verify at quote
Current replacementPowerPact M-frame, P-frame at top of range
Example catalogsMHL36600 (3-pole, 600 V, 600 A), MA36800 — confirm on nameplate

Cross-Reference

If you have (obsolete)Recommended pathNotes
MA (standard AIC)PowerPact M-frame by amp & AICMatch the interrupting rating to the available fault current.
MH / MHL (higher AIC)PowerPact M-frame high AIC, or P-frameHigher-interrupting tier — keep AIC at or above the original.
Switchboard main / large feederNew-surplus / used-tested MA / MH (we source)Avoids reworking large bus, lugs, and cable on existing gear.
Top of the amp rangePowerPact P-frameWhere the application exceeds the M-frame's rating.

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 MA / MH still made?

No. The MA / MH frames are discontinued; the PowerPact M-frame (and P-frame at the top of the range) is the current equivalent. Large-frame mains are expensive to retrofit because the bus, lugs, and cable terminations are built around the original — so a surplus MA / MH drop-in (for example MHL36600) usually beats reworking a switchboard. We source the original and keep the PowerPact path ready so you can plan the upgrade on your schedule.

FAQ

Is the Square D MA / MH discontinued?
Yes — the MA and MH large frames are discontinued. New-surplus, used-tested, and reconditioned units remain available through Edmundson Industrial.
What replaces a Square D MA or MH breaker?
The PowerPact M-frame, stepping to the P-frame at the top of the range, selected by amp and interrupting rating. We also source original MA / MH surplus.
Can you source MHL36600 or MA36800?
Yes — send the exact catalog string and we'll quote new-surplus, used-tested, or reconditioned with condition disclosed.
Why drop in a surplus main instead of retrofitting?
A large-frame main is built into the switchboard's bus and lugs. A surplus drop-in avoids costly gear rework and downtime; retrofit to PowerPact at a planned upgrade.
Can you help if the new breaker doesn't fit the switchboard?
Yes; our fabrication side builds adapter plates, lug adapters, and bus hardware so a current PowerPact mounts where the MA / MH came out.

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