Eaton Power Xpert UX primary switchgear (IEC, to 36 kV via UX 36)
Eaton Power Xpert UX, the SF6-free IEC primary flagship to 4,000 A and 50 kA with a 36 kV variant
Eaton Power Xpert UX primary switchgear (IEC, to 36 kV via UX 36) is one of 41 data center switchgear tracked in the SecondWatt catalogue, each with specifications, lead times and indicative secondary-market pricing.
Eaton Power Xpert UX dossier: SF6-free IEC primary switchgear to 4,000 A and 50 kA with AFLR arc class and a 36 kV variant, market structure, inspection.
Why it matters
UX pairs the category's toughest arc rating tier (AFLR 50 kA/1 s) with SF6-free construction, the combination EU utilities now specify by default. Its zero-surplus structure reinforces the category thesis: IEC primary lineups are intelligence subjects, not marketplace inventory, until decommission waves begin.
Role in the data center
Primary MV distribution for IEC-market campuses and imported package plants; the SF6-free AFLR 50 kA spec suits dense urban interconnects.
Key specifications
| Voltage classes | 3.6-24 kV (UX); 36 kV (UX 36) |
|---|---|
| Current range | 630-4,000 A |
| Breaking capacity | to 50 kA / 3 s |
| Internal arc | AFLR to 50 kA / 1 s |
| Service continuity | LSC2B / PM |
| UX 36 ratings | 36 kV / 2,500 A / 31.5 kA 3 s |
| Builds | single and double busbar (duplex) |
| Insulation | air + cast resin + vacuum (SF6-free) |
Technical summary
Voltage classes: 3.6 / 7.2 / 12 / 17.5 / 24 kV; UX 36 at 36 kV Current: 630-4,000 A (2,500 A max at 24 kV) Breaking: to 50 kA / 3 s Peak withstand: 63-130 kA by class Internal arc: AFLR to 50 kA / 1 s (31.5 kA at 24 kV) Service continuity: LSC2B; partition class PM Insulation: air + cast resin; vacuum interrupters; SF6-free UX 36: 36 kV / 2,500 A / 31.5 kA 3 s Builds: single and double busbar (duplex) Standard: IEC 62271-200
Pricing and availability
Trend: up Lead time, new: 52-104 weeks (IEC MV class by voltage). Lead time, used or refurbished: No secondary channel exists. 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