Schneider Electric Square D I-Line Circuit Breaker Panelboard

I-Line is a general Square D panelboard, not Schneider's RPP -- that is Galaxy RPP, built on NQ/NF

Schneider Electric Square D I-Line Circuit Breaker Panelboard is one of 4 remote power panels tracked in the SecondWatt catalogue, each with specifications, lead times and indicative secondary-market pricing.

Schneider Square D I-Line panelboard specs, UL 67 vs 891 gap, breaker sourcing, and why this is not Schneider's actual data-center RPP, Galaxy RPP.

I-Line names three things at Schneider Electric: I-Line busway, a separate SecondWatt category; Square D I-Line circuit breaker panelboards, this dossier's subject; and neither is Schneider's actual data-center remote power panel. That product is Galaxy RPP, built on Square D NQ, NF, and IP2X panelboards, not I-Line -- its own spec mentions I-Line once, as an optional surge-protection accessory. A buyer searching for a Schneider RPP should be sent to Galaxy RPP, not I-Line. This dossier documents I-Line panelboard in full depth because it is what the assigned slug names and what appears, unbadged, in used-equipment listings. It is a general-purpose branch panelboard -- pitched for service entrance and downstream distribution in commercial or industrial facilities -- resold under the RPP umbrella by secondary-market dealers, not a Schneider RPP product. I-Line panelboard carries only a UL 67 listing (File E33139); UL 891 is never claimed in Schneider's own I-Line literature, a gap against IEM's purpose-built RPP, which claims both. Seismic certification is real but narrow: OSHPD preapproval OSP-0022 covers one tested unit, model HCR548612U at 1200A main, to ICC-ES AC156, not the whole family. The integral, ratchet-type bus-stab connector is the single most consequential fact for a buyer: only same-frame-family breakers, from 37 catalogued codes, seat correctly.

Why it matters

A buyer who assumes a used I-Line panel carries the same UL 891 listing, seismic blanket coverage, or monitoring accuracy disclosure as a purpose-built RPP is assuming facts Schneider's own I-Line literature does not state. Breaker sourcing is the practical risk: only same-frame-family breakers seat on the bus, and Schneider's own cross-generation guidance runs through specific FAQ cross-references, each carrying a physical fit-up caveat, not a blanket compatibility statement.

Who buys it

Buyers are facility teams sourcing a compatible replacement panelboard for an existing I-Line branch distribution system, or data center operators evaluating a dealer-listed used panel marketed loosely as an RPP without realizing Schneider itself never badges I-Line that way.

Role in the data center

None, by Schneider's own naming -- I-Line panelboard is not marketed as a data-center product. Where it appears in a data hall, it is functioning as generic branch distribution equipment, typically as a like-for-like replacement for an existing I-Line-based system rather than a purpose-selected RPP. A buyer specifically wanting Schneider's data-center RPP role filled should look at Galaxy RPP instead.

Key specifications

Technical summary

Main lug / main breaker rating: 400-1200A (lugs), 100-1200A (main breaker) System voltage: 120/240 (1-phase) to 600Y/347 (3-phase), plus DC to 250V Branch breaker frame families cataloged: 37 distinct codes SCCR with I-Limiter main breaker: up to 200,000A RMS symmetrical (100kA @ 600Vac) UL listing: UL 67, File E33139 -- UL 891 not claimed anywhere in I-Line literature Enclosure (NEMA) types: 1, 2, 3R, 4/4X, 5, 12 Panel dimensions: 26-44in wide, 9.5in deep, 48-91in tall Seismic: OSHPD OSP-0022 covers model HCR548612U, 1200A main, tested to ICC-ES AC156 only Branch monitoring: I-Line Enable Module with PowerLogic PM5563 / PM8244, Modbus I-Line Combo sub-line: 70-1200A (main breaker) or 225-1200A (main lugs)

Configurations and options

<cite index="16-2,31-10">Main breaker or main lug configuration</cite>; <cite index="15-1,15-314">Single or duplex configurations, which determine the number of included lighting sections</cite>; <cite index="15-307">Ready-to-install kits are available as cable-fed field-installable options</cite>; <cite index="14-32">Available factory-assembled or merchandised</cite>

Compatibility and dependencies

I-Line's bus-stab connector is integral to the breaker itself, a ratchet-type blow-on design rather than a bolt-on mount, and fault current actually strengthens the jaw-to-stab grip during a short circuit. The tradeoff is sourcing risk: only same-frame-family breakers, drawn from 37 catalogued codes (FA, HD, JD, LG, PG, RG, and others), seat correctly on a given panel's bus, and a mismatched frame will not fit regardless of amperage rating. The contrast with Schneider's own busway line is the point. Schneider publishes a blanket cross-generation statement for I-Line busway, stating that PBQ 400 to 600A fusible switches fit both I-Line and I-Line II busway. No equivalent blanket statement exists for I-Line panelboard breakers. Instead, succession runs through specific FAQ cross-references, such as KA36225 to JGA36225, and even that published cross-reference carries a physical caveat: the replacement breaker's retaining screw threads to a different depth than the original, and Schneider's own FAQ instructs installers to test-fit rather than assume compatibility.

Pricing and availability

Published price range: $400 - $5,000 used; $7,058 - $22,432 new (dealer channel). Trend: flat Not publicly available

Lifecycle and maintenance

Schneider's own molded-case breaker FAQ cites a 30-year life expectancy under favorable conditions, with annual OFF-ON-TRIP-RESET-ON exercising recommended to preserve reliability (se.com/us/en/faqs/FA228296). I-Line panelboards have no rotating parts and no OEM-published overhaul interval; service life is gated by breaker condition and parts availability, not the bus. Schneider maintains at least one active obsolete-breaker replacement path (KA-frame to HGA/JGA-frame) but no blanket cross-generation statement. The I-Line Enable Module remains in current production and Modbus-connected; support depth for older monitoring hardware was not established.

Common failure points

• Bus-stab jaw / breaker connector — localized heating or discoloration at a breaker's mounting point, sometimes with a burning odor
• Legacy KA-frame breaker — an installed breaker no longer appears in Schneider's current I-Line catalog and carries a discontinued frame stamp
• Recalled F/K-frame breaker — breaker fails to trip on a sustained overload
• Main SCCR mismatch — panel's field-marked short-circuit rating is lower than the available fault current at the new installation site
• Branch circuit monitoring module — I-Line Enable Module or third-party retrofit meter reports data with no verifiable accuracy class
• Bus insulation — decommissioned panel with an unknown thermal and moisture history shows no visible defect but fails a megger test
• Seismic certification overreach — seller markets a used unit as seismically rated without a matching model number or test report

Inspection checklist

Confirm the main lug or main breaker nameplate rating falls within I-Line's cataloged 400-1200A range — a panel stamped below its expected capacity may signal a prior downgrade or undersized retrofit. Match every branch breaker's frame-family stamp against the panel's bus-stab class before sourcing spares — Schneider's own catalog recognizes 37 distinct I-Line frame-family codes, and only a matching family is guaranteed to seat on the ratchet-clip bus. Cross-check branch and main breaker date codes against Schneider's 2014 recall of F- and K-frame units (date codes 13184-13255) — a recalled breaker that fails to trip on overload is a live fire and shock hazard, not a cosmetic defect. Verify the UL label is intact and legible under File E33139 (UL 67) — a defaced or missing label forces a field re-listing review before the panel can be reenergized. If the main breaker is an I-Limiter model, confirm it actually delivers the panel's stated 200,000A RMS symmetrical short-circuit rating (100kA at 600Vac) — a standard, non-I-Limiter main breaker rates far below that ceiling. Where a legacy KA-frame breaker remains installed, price the Schneider-published replacement path (e.g., KA36100 to HGA36100, KA36225 to JGA36225) rather than assuming a like-for-like swap — the retaining screw threads to a different depth than the original frame, and Schneider's own FAQ flags this as a fit-up item to verify, not a guarantee. Megger-test the bus and every branch circuit for insulation resistance before reenergizing — a decommissioned panel with 10 or more years of unknown thermal and moisture history should not be assumed sound from a visual inspection alone. Inspect the bus-stab jaws at every occupied breaker position for pitting, discoloration, or visible looseness — I-Line's connector is integral to the breaker and depends on tight jaw-to-stab contact that a bolt-on design does not require. Record the installed breaker count against the enclosure's rated pole capacity — one 800A HCJ-family unit reviewed carried only 7 installed breakers against a fully populated bus, typical of a partially loaded resale panel. Confirm the stamped system voltage (208Y/120, 480Y/277, or 600Y/347) matches the buyer's intended feed — a 600V-rated panel cannot be dropped onto a 208V feed without a full re-verification of breaker and bus ratings. Ask for the breaker exercise history — Schneider's own molded-case breaker FAQ cites a 30-year life expectancy under favorable conditions but recommends annual OFF-ON-TRIP-RESET-ON cycling to preserve it, and a panel with no exercise record has an unknown position on that curve. Confirm the enclosure's NEMA rating — I-Line panelboards are cataloged in six distinct classes (Type 1, 2, 3R, 4/4X, 5, and 12) — matches the deployment environment; a Type 1 indoor panel relocated to an exposed or wash-down area is a non-compliant reuse. If seismic certification is claimed for the specific unit, request the underlying test report — Schneider's OSHPD preapproval (OSP-0022) covers a 1200A I-Line panelboard (model HCR548612U) tested to ICC-ES AC156, and certification does not automatically extend to every panel size, vintage, or mounting configuration. Request the SCCR field-marking history under NEC 408.6 — the marked rating must equal or exceed available fault current at the panel's point of use, and a panel that has been relocated or had its upstream service changed since original installation needs this re-verified before reenergizing.

Procurement channels

Surplus Record's Square D panelboard category listing and Quantum Technology Equipment both carry recurring used I-Line inventory; RSP Supply carries new-condition dealer-channel stock at list and sale pricing.

Regional notes

<cite index="10-11,14-11">UL 50 standards for US market; CSA C22.2, Nos. 29 and 94—1989 for Canada</cite>; <cite index="10-18">Systems include 120/240VAC, 208Y/120VAC, 480Y/277VAC, 600VAC supporting both 50/60 Hz applications</cite>