Schneider Electric MCset air-insulated metal-clad switchgear (to 17.5/24 kV)
Manufacturer: Schneider Electric
Schneider MCset metal-clad switchgear, the still-commercialized legacy-generation AIS reaching 4,000 A and 50 kA
This model is part of SecondWatt’s switchgear research catalogue. Specifications and price observations are included where supported by sources. Equipment availability and commercial terms require confirmation.
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.
MCset is Schneider Electric's air-insulated, metal-clad primary MV switchgear with withdrawable breakers. Its status is worth stating precisely, because it reads two ways: se.com still shows MCset as COMMERCIALIZED on live range pages, while GM AirSeT is the strategic successor Schneider steers new primary builds toward. Voltage classes run 7.2/12/17.5 kV with a 24 kV variant documented in the user guide, functional units at 630/1,250/2,500 A up to 4,000 A, and short-circuit ratings of 25/31.5 kA up to 50 kA on 17.5 kV incomers.
The generation story matters on the used market: historic MCset shipped with SF1/SFset SF6 breakers, while current builds carry EasyPact EXE vacuum breakers, so decommissioned early units bring F-gas handling obligations their vacuum-equipped siblings avoid.
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 medium-voltage distribution in IEC-market industrial plants and legacy campus installations, taking the incoming feed and sectioning it to unit substations.
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 |
| Functional unit currents | 630 / 1,250 / 2,500 A |
| Incomer panel width (4,000 A, 17.5 kV) | 900 mm |
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.
Major variations
Incomer, feeder, bus-sectioning and metering functional units across the 7.2, 12 and 17.5 kV classes plus the 24 kV variant, in panel widths from 570 mm on a 12 kV bus-section to 900 mm on a 17.5 kV 4,000 A incomer, at 800-1,200 kg per unit. Breaker generation splits the installed fleet in two: SF1 and SFset SF6 breakers on historic units, EasyPact EXE vacuum breakers on current builds. Schneider's range page also carries a product-substitution section that maps MCset functional units to their current replacements.
Configurations and options
Functional units are ordered by duty, incomer, feeder, bus-sectioning or metering, at 7.2, 12 or 17.5 kV with a 24 kV variant, rated 630, 1,250 or 2,500 A and up to 4,000 A, at 25 or 31.5 kA and up to 50 kA on a 17.5 kV incomer. Panel width follows the rating, from 570 mm on a 12 kV, 4,000 A, 31.5 kA bus-section to 900 mm on a 17.5 kV, 4,000 A, 50 kA incomer, at 800-1,200 kg per unit. The breaker era changes both value and liability on a used unit: historic panels carry SF1 or SFset SF6 breakers while current builds carry EasyPact EXE vacuum breakers. BIL and internal arc values live in catalogue NRJED312404EN.
Compatibility and dependencies
Air-insulated metal-clad construction with withdrawable breakers, so the breaker and its cassette are a matched pair and the breaker generation decides the spares route: EasyPact EXE vacuum units and the older SF1 and SFset SF6 units are different products, and a panel built for one does not accept the other. Bus rating and short-circuit withstand have to be coordinated with the upstream transformer, noting that 50 kA is an incomer figure at 17.5 kV rather than a family-wide rating. Panel widths of 570-900 mm at 800-1,200 kg per unit set the room, the floor loading and the rigging plan. Schneider's range page carries a product-substitution section that should be read before any replacement is quoted.
Pricing and availability
Trend: rising 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.
Thermal and emissions profile
Switchgear produces no combustion emissions; the regulatory profile is electrical safety and materials. NFPA 70B became a standard in its 2023 edition, making maintenance programs mandatory rather than recommended, and arc-flash rules (NFPA 70E) govern work practices. LV air-insulated gear carries no F-gas exposure, and construction standards (UL 891, UL 1558, IEEE C37.20.1) plus arc-resistant options under IEEE C37.20.7 define the safety envelope buyers should verify.
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.
Procurement channels
Schneider channels supply new units and EasyPact EXE replacement breakers; GES Repair is the observed US repair and parts route and quotes rather than publishes prices; Surplus Record's metal-clad category is the generic channel to monitor.
Regional notes
An IEC line with a thin North American footprint: the observed US route is repair and parts through a third-party shop that quotes rather than publishes prices, and the installed base sits in imported plant. Schneider still lists MCset as commercialised while steering new primary-distribution work to GM AirSeT. A 50 Hz panel is not usable on a 60 Hz North American project without significant engineering, and the SF6 breaker era brings F-gas handling obligations under EU Regulation 2024/573 that vacuum-equipped panels avoid.