NVIDIA Mellanox MTEF-PSF-AC-B 400W AC Power Supply, P2C Airflow, BBU-Ready: This is a 400W AC-input hot-swappable power supply unit for the MSB7790 and MSB7780 InfiniBand switch platforms. Airflow direction is P2C (Power-to-Connector). The unit is BBU-ready (Battery Backup Unit compatible) — the PSU itself is not a battery; it is the power supply that is engineered to interoperate with the chassis battery-backup option. This is a field-replaceable PSU module, not a switch chassis and not a standalone battery. This is a new unit.
Engineering Context
The MTEF-PSF-AC-B is purpose-built for the MSB7790 and MSB7780 EDR InfiniBand switches. It outputs 400W from a wide-range AC input and operates in 1+1 redundancy with a matching second PSU. Because the platform supports an optional Battery Backup Unit, the PSU coordinates ride-through and graceful-shutdown signaling with the BBU when one is fitted. P2C airflow must align with the chassis fan modules; mismatched airflow will trigger thermal alarms. The PSU is hot-swappable and reports input/output/fault state through the chassis management plane.
Deployment & Use Cases
New replacement PSU for MSB7790 and MSB7780 EDR InfiniBand switches in production HPC and AI/ML clusters. Bring-up of refurbished MSB7790/MSB7780 chassis where the original PSU is missing. Stocking inventory for sites running BBU-protected fabrics. Restoring 1+1 power redundancy after a PSU failure.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MTEF-PSF-AC-B
Type: Hot-Swap AC PSU (BBU-compatible)
Output Power: 400W
Input: AC, wide-range
Airflow Direction: P2C (Power-to-Connector)
Compatible Chassis: MSB7790, MSB7780
BBU Support: Yes (compatible with chassis Battery Backup Unit option)
Hot-Swap: Yes
Condition: New
Compatibility & Hard Constraints
Compatible only with the MSB7790 and MSB7780 chassis families. Not interchangeable with the 460W MTEF-PSF-AC-A, nor with Quantum or Spectrum-2 PSUs. The unit is BBU-ready but does not include a battery — the BBU is a separate part. Airflow direction must match the chassis fans; do not mix P2C and C2P units in a redundant pair.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS supplies factory-new MTEF-PSF-AC-B units with new-product warranty. We provide expert guidance on Mellanox PSU and BBU pairing, global shipping, and a 1–3 day handling window. Visit www.tes-itsolutions.com for the full catalog.