Schneider Electric Square D I-Line Circuit Breaker Panelboard
Manufacturer: Schneider Electric
I-Line is a general Square D panelboard, not Schneider's RPP -- that is Galaxy RPP, built on NQ/NF
This model is part of SecondWatt’s remote power panel research catalogue. Specifications and price observations are included where supported by sources. Equipment availability and commercial terms require confirmation.
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 two different Schneider Electric products: I-Line busway, and the Square D I-Line circuit breaker panelboards covered here. Neither is Schneider's 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 looking for Schneider's RPP wants Galaxy RPP, not I-Line.
I-Line panelboard is what appears, unbadged, in used-equipment listings sold under the RPP umbrella. 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
| Main lug / main breaker rating | 400-1200 (lugs); 100-1200 (main breaker) A |
|---|---|
| System voltage range | 120/240 (1-phase) to 600Y/347 (3-phase), plus DC to 250 V |
| Branch breaker frame families cataloged | 37 distinct codes (FA, FH, BD, BG, BJ, BK, HD, HG, HJ, HL, HR, QB, QD, QG, QJ, JD, JG, JJ, JL, JR, LA, LD, LG, LJ, LH, LL, LR, MG, MJ, PG, PJ, PK, PL, RG, RJ, RK, RL) count |
| SCCR with I-Limiter main breaker | 200,000 max (100,000 @ 600Vac) A RMS symmetrical |
| UL listing | UL 67, File E33139 standard |
| Enclosure (NEMA) types | Type 1, 2, 3R, 4/4X, 5, 12 classes |
| Panel width | 26-44 in |
| Panel depth | 9.5 (standard); up to 12 (combo) in |
| Panel height | 48-91 in |
| Seismic certification (model-specific) | OSP-0022, model HCR548612U, 1200A main, tested to ICC-ES AC156 certification |
| Branch monitoring accessory | I-Line Enable Module, pairs with PowerLogic PM5563 / PM8244, Modbus product |
| I-Line Combo amperage range | 70-1200 (main breaker); 225-1200 (main lugs) A |
| Legacy breaker cross-reference example | KA36100 to HGA36100; KA36125 to HGA36125; KA36150 to JGA36150; KA36225 to JGA36225 (18kA @ 600V, 35kA @ 480V, 65kA @ 240V) cross-reference |
| Recall window, F/K-frame breakers | Manufactured 2013-05-02 to 2013-06-21 (F), 2013-05-08 to 2013-06-10 (K); date codes 13184-13255 / 13193-13241 recall scope |
| New-unit price observed | 18,693.07 (sale) / 22,431.68 (list), 800A HCJ36918MP USD |
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).
Major variations
The I-Line panelboard family spans several model-prefix variants: HCJ and HCP (general I-Line distribution panelboards), HCP-SU and HCR-U (variants in the catalog's dimension tables), and HCM and HCN (seen in resale listings such as HCM14484 and HCN0952-2MN). A separate I-Line Combo sub-line (catalog 2110CT1301) merges an NQ or NF lighting section with an I-Line distribution section in one enclosure, extending the amperage range down to 70A. Distributor listings also badge a small, unrelated product as I-Line: Graybar's HQO306, a 240V, 3-pole, 30A QO-breaker panel labeled QO I-Line Panelboard. This is light-commercial/residential-scale equipment, not the 400 to 1200A HCJ/HCP/HCR-class family covered here, and it is not RPP-scale equipment.
Configurations and options
Main breaker or main lug configuration; single or duplex configurations, which determine the number of included lighting sections; ready-to-install kits available as cable-fed field-installable options; available factory-assembled or merchandised.
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.
Pricing and availability
Published price range: $400 - $5,000 used; $7,058 - $22,432 new (dealer channel). Trend: stable
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; Schneider publishes no support-depth statement for older monitoring hardware.
Thermal and emissions profile
As a branch circuit distribution panelboard, Square D I-Line carries no refrigerant charge and produces no combustion exhaust stream; its environmental footprint is limited to the embodied energy of its steel enclosure, copper bus, and breakers, plus standard end-of-life electrical equipment recycling. No published source as of August 2026 states an EPA program position or a GWP figure for this product, consistent with it being a bus-and-breaker product rather than a refrigerant-bearing or combustion-driven one. The I-Line Enable Module supports load data that can feed a facility's own energy accounting, but that is a monitoring feature, not an emissions position Schneider itself publishes for the panelboard.
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 no documented thermal or 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.
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. Schneider's authorized distribution channel publishes no online list price for I-Line panelboards; every OEM-adjacent channel quotes on request.
Regional notes
UL 50 enclosure standards apply for the US market; CSA C22.2 Nos. 29 and 94-1989 for Canada. Systems include 120/240 VAC, 208Y/120 VAC, 480Y/277 VAC and 600 VAC, supporting both 50 and 60 Hz applications.