M90U-140 vs Vertiv Liebert EXM 208V
The Xtreme Power M90U-140 and the Vertiv Liebert EXM 208V are modular online double-conversion UPS for 208V three-phase environments. In an equal 23.6-inch cabinet the M90U-140 reaches 140 kW with N+1, where the Liebert EXM reaches 100 kW; the EXM scales higher only in a wider 34.6-inch frame. For facilities prioritizing compact footprint, consistent N+1 scalability, and segmented battery architecture, the M90U-140 delivers a high-density, service-optimized platform.
An M90U-140 with its M90-BC battery enclosure deployed in a live electrical room, alongside a row of distribution cabinets.
What the M90U-140 brings
- High power density in a narrow 23.6-in cabinet (140 kW where the EXM does 100 kW at equal width).
- N+1 redundancy to 140 kW within a single 23.6-in frame.
- Segmented external battery cabinet with individually breakered strings.
- Internal maintenance bypass included as standard.
- Consistent cabinet footprint across the full capacity range.
- Longer standard warranty coverage.
Feature comparison
| Specification | Xtreme Power M90U-140 | Vertiv Liebert EXM 208V | Advantage |
|---|---|---|---|
| Rated capacity | Up to 140 kW N+1 (23.6-in cabinet) | 100 kW (23.6-in); up to 200 kW (34.6-in) | EXM scales higher in a wider 34.6-in frame |
| Available power sizes | 15–140 kW | 20–200 kW | EXM spans higher; M90U-140 starts at 15 kW |
| N+1 redundancy | Up to 140 kW (23.6-in frame) | 80 kW (23.6-in); 180 kW (34.6-in) | More N+1 in the equal-width 23.6-in frame |
| Modular architecture | Power, battery & static-switch modules | Power modules | Modular static switch |
| Battery system | External M90-BC, up to 8 individually breakered strings | External cabinets, single string per cabinet | Segmented, breakered strings |
| Maintenance bypass | Internal, standard | Internal, optional | Standard, no added option |
| UPS cabinet width | 23.6 in | 23.6 in or 34.6 in | Equal at 23.6 in; EXM widens for capacity |
| Warranty | 2-year parts standard | 1-year parts | Longer standard warranty |
Both are modular online double-conversion UPS for 208V three-phase. In an equal 23.6-in cabinet the M90U-140 reaches 140 kW with N+1 where the Liebert EXM reaches 100 kW (80 kW N+1); the EXM scales higher only in a wider 34.6-in frame (up to 200 kW / 180 kW N+1). The M90U-140 adds a modular static switch, segmented breakered battery strings, a standard internal maintenance bypass, and a longer standard warranty. Confirm Liebert EXM specifications against current Vertiv documentation.
Choosing between them
Choose the M90U-140 for full 140 kW N+1 in a narrow 23.6-in cabinet, segmented breakered battery architecture, and a standard internal bypass; the Liebert EXM fits facilities needing total capacity beyond 140 kW in a wider frame, unconstrained cabinet width, or standardization on Vertiv.
Choose the M90U-140 if you need
- Full 140 kW N+1 within a 23.6-in cabinet
- Segmented battery architecture with breakered strings
- Internal maintenance bypass as standard
- High power density without expanding cabinet width
- Longer standard warranty coverage
The Liebert EXM 208V may fit if you need
- Total capacity beyond 140 kW (wider frame)
- Unconstrained cabinet width / wider frames
- Alignment with existing Liebert EXM deployments
Related comparisons
Plan your enterprise modular UPS deployment
Talk to an Xtreme Power specialist about sizing the right M90U-140 configuration and runtime architecture, planning N+1 redundancy to 140 kW and phased capacity expansion, and comparing modular three-phase platforms for data center, healthcare, industrial, and critical-infrastructure environments.