Square D Circuit Breaker Cross-Reference

Square D retired its classic molded-case frames: FA, KA, LA, MA, and the older I-Line styles: in favor of the PowerPact line (H, J, L, M, and P frames). This hub maps each legacy frame to its PowerPact path and links to a detail page for the highest-demand families. For every frame, Edmundson Industrial sources new-surplus, used-tested, and reconditioned breakers so you can drop in the original or retrofit to current: whichever gets the panel back faster.

Legacy frame → PowerPact

Legacy frame	Amp range	Current PowerPact	Detail page
FA / FAL	to 100 A	PowerPact H-frame (HD / HG / HJ / HL)	FA / FAL →
KA / KAL	to 250 A	PowerPact J-frame (JD / JG / JJ / JL)	KA / KAL →
LA / LAL	to 600 A	PowerPact L-frame (LD / LG / LJ / LL)	LA →
HDA / HJA (I-Line)	to 150 A	PowerPact H-frame I-Line	HDA / HJA →
MA / MH	to ~800 A	PowerPact M-frame / P-frame	MA / MH →

Amp ranges are nominal: the catalog number encodes poles, voltage, amp rating, and interrupting class. Confirm against the nameplate before substituting.

How do you read a Square D catalog number?

Square D molded-case numbers follow [frame][poles][voltage][amps]. The frame letters also carry the interrupting tier (for example FA vs FAL, KA vs KAL). Voltage codes: 2 = 240 V, 4 = 480 V, 6 = 600 V.

Catalog	Frame	Poles	Voltage	Amps
LA36400	L-frame	3	600 V	400 A
KAL36250	K-frame (high AIC)	3	600 V	250 A
KA36150	K-frame	3	600 V	150 A
HJA36100	H-frame I-Line	3	600 V	100 A
FA32100	F-frame	3	240 V	100 A

Decode shown as a guide: always verify against the breaker nameplate.

Demand lives on the surplus market

Many of these numbers are nearly invisible on Google yet trade heavily on the secondary market: FA-frame breakers show on the order of several thousand active marketplace listings against under ten Google searches a month. For obsolete breakers, marketplace liquidity, not search volume, is the real demand signal, which is exactly why availability wins these jobs.

Drop-in original or retrofit to PowerPact?

A surplus original keeps a panelboard or MCC bucket exactly as-built. A PowerPact retrofit is the long-term path but can change the footprint, especially on I-Line. When it does, our fabrication side makes the adapter brackets and filler plates so the new breaker fits the old opening: part and panel on one PO.

FAQ

What replaced the Square D FA, KA, and LA breakers?

The PowerPact line: H-frame for FA-class, J-frame for KA-class, L-frame for LA-class, and M / P frames for larger MA-class breakers. We also source the originals as surplus.

Are Square D FA / KA / LA breakers still made?

No: these classic frames are discontinued in favor of PowerPact. New-surplus, used-tested, and reconditioned units remain available through Edmundson Industrial.

How do I read a Square D catalog number?

The letters give the frame and interrupting class; the digits give poles, voltage, and amp rating. For example, LA36400 is an L-frame, 3-pole, 600 V, 400 A. Always confirm against the breaker nameplate.

Do you have parts like LA36400 or FA32100?

These are common catalog numbers that trade actively on the surplus market: FA-frame breakers alone show thousands of live secondary-market listings against almost no Google volume. Send the exact number and we'll quote new-surplus, used-tested, or reconditioned with condition disclosed.

Will a PowerPact breaker fit my old Square D panel?

Sometimes, sometimes not: I-Line and bolt-on footprints changed. Our fabrication side builds adapter and filler hardware so a current PowerPact lands in the legacy opening.

Request a Quote

or send the Square D catalog number to sales@edmundsonindustrial.com · (832) 975-8827 · Houston, TX. Response timing is confirmed with the request.

Square D family pages

Send the catalog number off the breaker.

Condition disclosed before sale. Response timing is confirmed with the request.

Request a Quote