Schneider Electric MCset air-insulated metal-clad switchgear (to 17.5/24 kV)
Schneider MCset metal-clad switchgear, the still-commercialized legacy-generation AIS reaching 4,000 A and 50 kA
Schneider Electric MCset air-insulated metal-clad switchgear (to 17.5/24 kV) is one of 41 data center switchgear tracked in the SecondWatt catalogue, each with specifications, lead times and indicative secondary-market pricing.
Schneider MCset dossier: metal-clad AIS to 17.5 kV, 4,000 A, and 50 kA, SF1-to-EXE breaker eras, commercialized-legacy status, inspection checklist.
Why it matters
MCset shows how 'commercialized' and 'legacy' coexist: Schneider still sells it while its successor takes the spotlight, and the substitution mapping on the range page is the signal to watch. For buyers, breaker generation (SF6 SF1 versus vacuum EXE) splits the fleet into two different liability profiles under F-gas rules.
Who buys it
IEC-market industrials and utilities with installed MCset lineups buy spares, EasyPact EXE replacement breakers, and repair services; US exposure arrives through imported process plants. New-build buyers are steered to GM AirSeT, making MCset a fleet-support market rather than a growth line.
Role in the data center
Primary MV distribution in IEC-market industrial and legacy campus installations; for SecondWatt it is a spares-and-service fleet, not a growth listing category.
Key specifications
| Voltage classes | 7.2 / 12 / 17.5 kV (24 kV variant) |
|---|---|
| Current ceiling | 4,000 A |
| Short-circuit ceiling | 50 kA (17.5 kV incomer) |
| Bus-section example | 12 kV / 4,000 A / 31.5 kA / 570 mm |
| Current breaker | EasyPact EXE vacuum |
| Status | COMMERCIALIZED (legacy generation) |
| Catalog | NRJED312404EN |
| Unit weight | 800-1,200 kg |
Technical summary
Voltage classes: 7.2 / 12 / 17.5 kV (24 kV variant per user guide) Functional units: 630 / 1,250 / 2,500 A; up to 4,000 A Short-circuit: 25 / 31.5 kA; up to 50 kA (17.5 kV incomer) Construction: air-insulated metal-clad, withdrawable breakers Breaker eras: SF1/SFset (SF6, historic) to EasyPact EXE (vacuum, current) Status: COMMERCIALIZED (se.com); legacy generation Unit width example: 900 mm (4,000 A incomer); weight 800-1,200 kg Market: IEC; not an ANSI/US line
Pricing and availability
Trend: up Lead time, new: 60-80 weeks (metal-clad class). Lead time, used or refurbished: Repair/quote channel only. Warranty, used: 1-year typical from reconditioning dealers.
Lifecycle and maintenance
Metal-clad MV switchgear routinely serves 40+ years: vacuum interrupters rated for 10,000-30,000 operations far outlast the mechanical duty standby service imposes, so lineup life is governed by insulation condition and relay/controls vintage. Breakers recondition readily and trade as units, while lineups modernize in place with digital relays and retrofit breakers. ANSI/NETA MTS acceptance testing at purchase plus PD surveys in service are the condition gates.
Common failure points
- Vacuum interrupters — Loss of vacuum ends interrupting capability with no external sign
- Insulation tracking and PD — Partial discharge across dusty or damp insulation progressing to flashover
- Racking and interlocks — Damaged racking screws and defeated interlocks from forced operation
- Protection relays — Obsolete or drifted relays mis-operate under fault
- Instrument transformers — CT/VT failures disable metering and protection inputs
- Space heater failure — Condensation-driven tracking in unheated outdoor or humid gear
Inspection checklist
Vacuum integrity — hipot test each interrupter per OEM procedure (e.g., 36 kV test on 15 kV class) Insulation resistance — megger bus and breakers at 2,500-5,000 V; compare to ANSI/NETA MTS tables Contact resistance — micro-ohm each pole; investigate imbalance beyond 50% between phases Partial discharge — ultrasonic and TEV survey; investigate any reading 6 dB above baseline Contact erosion — measure vacuum interrupter erosion marks against the OEM wear allowance Racking mechanism — cycle connect/test/disconnect positions 3 times each; verify interlocks and shutters Mechanism timing — verify open/close times; closing beyond 5 cycles flags mechanism trouble Bus insulation — inspect epoxy and boots for tracking or corona; clean and torque joints Instrument transformers — verify CT/VT ratios, insulation, and fusing Protection relays — test to calibration cycle; electromechanical relays need 1-2 year intervals Arc rating — confirm arc-resistant construction class (IEEE C37.20.7 Type 2B) matches the installation Heaters — verify space heaters work; condensation drives tracking failures in unheated gear Nameplate — confirm voltage class, BIL (60-150 kV by class), and interrupting rating against the application Standards — verify IEEE C37.20.2 construction and UL/CSA labels; run ANSI/NETA MTS acceptance tests Records — factory test report, maintenance history, and operation counts; missing history reprices as-is