TX91-6kVA vs NXT Integrity Max NPTU6000
The Xtreme Power TX91-6kVA and the NXT Power Integrity Max NPTU6000 are true online double-conversion isolation UPS for electrically noisy industrial, laboratory, and infrastructure environments, both providing galvanic isolation and strong surge immunity. The TX91-6kVA differentiates on full 6 kVA / 6 kW unity-PF output, longer internal runtime (with an XR option), a narrower and shallower footprint, and built-in TAA compliance.
Where the TX91-6kVA leads
- Full 6 kVA / 6 kW unity-PF output — full usable watts versus the NXT’s 5.4 kW.
- Longer internal runtime — about 8 minutes (up to ~12 with XR) versus about 5 minutes.
- A narrower and shallower footprint for space-constrained installations.
- Built-in TAA compliance for federal and regulated procurement.
6 kVA isolation UPS, side by side
| Specification | Xtreme Power TX91-6kVA | NXT Power Integrity Max NPTU6000 | Advantage |
|---|---|---|---|
| UPS capacity | 6 kVA / 6 kW (unity PF) | 6 kVA / 5.4 kW | Full usable kW |
| Topology | Online double-conversion with isolation transformer | Online double-conversion with isolation transformer | Both galvanic isolation |
| ANSI/IEEE C62.41 | Yes | Yes | Equivalent surge |
| Output voltage options | 120 / 208 / 220 / 230 / 240 VAC | 120 / 208 / 220 / 230 / 240 VAC | Aligned |
| Internal runtime (full load) | ~8 min (up to ~12 min XR) | ~5 min | Longer runtime |
| Optional external battery packs | Yes | Yes | Equivalent scalability |
| Input / output architecture | Hardwired standard; plugs/receptacles optional | Hardwired standard; plugs/receptacles optional | Comparable |
| Dimensions (W × H × D) | 9.9 × 32.4 × 23.3 in | 11.8 × 28.4 × 29.1 in | Narrower & shallower |
| Warranty | 3 yr electronics / 3 yr battery | 3 yr electronics / 3 yr battery | Equivalent |
| Compliance / listings | UL1778, cUL, FCC-A, RoHS, TAA | UL1778, cUL, IEC 62040-1/-2, RoHS, OSHPD/HCAi | NXT adds OSHPD/HCAi |
| TAA compliance | Yes | No (standard SKU) | Federal procurement |
Both are true online double-conversion isolation UPS with galvanic isolation, equivalent surge immunity, the same multi-voltage output, and matching 3-year warranties. The TX91 delivers full 6 kW usable output, longer runtime, a smaller footprint, and TAA; the NXT carries OSHPD/HCAi listing. Confirm current NXT Power specifications against vendor documentation.
Choosing between them
Both deliver galvanic isolation and online double-conversion protection at 6 kVA. Choose the TX91-6kVA for full unity-PF 6 kW output, longer internal runtime, a smaller footprint, and TAA; the NPTU6000 fits where OSHPD/HCAi listing or an existing NXT standard governs.
Choose the TX91-6kVA if you need
- Full 6 kVA / 6 kW unity-PF usable output
- Built-in TAA compliance for federal, education, and public-sector procurement
- Longer internal runtime without external batteries
- XR extended-runtime capability
- A narrower, shallower isolation UPS for space-limited installations
- Simplified procurement for regulated environments
The Integrity Max NPTU6000 may fit if you need
- Existing NXT Integrity Max standardized deployments
- Facilities requiring OSHPD/HCAi-listed equipment
- Deployment in non-TAA-regulated projects
Related comparisons
Sizing an isolation UPS for a regulated or industrial deployment?
Xtreme Power supports TX91 isolation UPS sizing, runtime configuration (XR internal and external BP960 cabinets), grounding and power-quality strategy, and TAA-compliant procurement for industrial automation, medical imaging, and laboratory infrastructure.