Square D HDA / HJA: I-Line Cross-Reference

The Square D HDA and HJA are I-Line H-frame molded-case breakers rated to 150 A; the letter marks the interrupting tier: HDA standard, HJA high, with HGA and HLA between and above. Within the PowerPact H-frame line, older HDA / HJA catalog variants have been superseded, so confirm the exact catalog's current status at quote. Edmundson Industrial sources new-surplus, used-tested, and reconditioned HDA / HJA I-Line breakers to keep I-Line panelboards as-built.

Status

Brand	Square D / Schneider Electric
Frame	H-frame, I-Line plug-on
Amp range	to 150 A (nominal: confirm on nameplate)
Poles	2, 3
Voltage	240 / 480 / 600 VAC by catalog code
Interrupting tiers	HDA < HGA < HJA < HLA
Current replacement	Current PowerPact H-frame I-Line (verify exact variant)
Example catalogs	HDA36100, HJA36100, HDA36150 (decode: frame–poles–voltage–amps; confirm on nameplate)

Cross-Reference

If you have (obsolete)	Recommended path	Notes
HDA (standard AIC)	Current H-frame I-Line, standard AIC	Match amp rating and stab style; confirm current catalog at quote.
HJA (high AIC)	Current H-frame I-Line, high AIC	HJA is the high-interrupting tier: keep AIC at or above the original.
Keep the I-Line board as-built	New-surplus / used-tested HDA / HJA (we source)	Preserves the original stab and phase spacing with no bus rework.
Mixed / legacy I-Line panel	Like-for-like surplus	Match stab style and phase sequence to the existing interior.

Cross-references are starting points: confirm interrupting rating, poles, voltage, stab style, and phase sequence before substituting. Send the catalog number and we'll verify the match.

Key Specs (frame overview)

H-frame I-Line plug-on breaker, to 150 A
2 or 3 pole; 240 / 480 / 600 VAC by catalog code
Interrupting tier set by the letter: HDA / HGA / HJA / HLA
Plugs onto the I-Line bus stab: stab style and phase sequence must match
Accessories: shunt trip, auxiliary / alarm switch, undervoltage release: confirm per catalog

Is the Square D HDA / HJA still made?

The I-Line H-frame remains a current Square D platform, but specific older HDA / HJA catalog variants have been superseded: confirm the exact catalog at quote. For an existing I-Line board, matching the original breaker from surplus preserves stab and spacing without rework, so we quote both the surplus original and the current equivalent. HJA36100 and HDA36100 are steady, high-intent surplus requests.

FAQ

Are HDA / HJA breakers obsolete?

The I-Line H-frame remains current, but specific older HDA / HJA catalog variants have been superseded. We confirm the exact catalog status at quote and source surplus originals.

What is the difference between HDA and HJA?

Interrupting rating. HDA is the standard-AIC tier and HJA the high-AIC tier of the same 150 A I-Line H-frame; match or exceed the original AIC.

What does "I-Line" mean for replacement?

I-Line breakers plug onto a bus stab rather than bolting to lugs. The stab style and phase sequence must match; we verify these before quoting.

Can you match HDA36100 or HJA36100?

Yes: send the exact catalog number and we'll quote new-surplus, used-tested, or reconditioned with condition disclosed.

My I-Line opening doesn't match the new breaker: can you help?

Yes; our fabrication side makes I-Line filler plates and adapter hardware to close and fit legacy openings.

Availability & Quote

Condition 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. Response timing is confirmed with the request.

Related Square D pages

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