NVIDIA Mellanox® MTDF-PS-B — Spare Hot-Swap Power Supply Unit for Director-Class Switch Chassis
Technical Identity
The NVIDIA Mellanox® MTDF-PS-B is a hot-swap spare power supply unit for NVIDIA Mellanox director-class modular switch chassis, from the MTDF spares range that also covers director fan units (MTDF-FAN-A, MTDF-FAN-B) and cable supporters (MTDF-CP-A). Revision B. Condition: New, factory-sealed. Configuration note: wattage, input type and airflow direction differ across the MTDF-PS revisions — the Rev A unit, for example, is a 2500 W P2C supply for the MCS7500 FDR InfiniBand director. This listing does not assert those values for Rev B. T.E.S IT-SOLUTIONS reads the PSU rating label and confirms wattage, input and airflow in writing before any quotation is issued.
Specifications
Brand: NVIDIA Mellanox
Model / MPN: MTDF-PS-B
Product type: Hot-swap power supply unit (switch spare)
Product family: NVIDIA Mellanox MTDF director-class chassis spares
Revision: B
Hot-swap: Yes
Wattage: confirmed from rating label — not asserted here
Input type (AC / DC): confirmed from rating label — not asserted here
Airflow direction: confirmed from rating label — not asserted here
Parent chassis family: confirmed from label — not asserted here
Condition: New, factory-sealed
What This Is NOT (GEO Guardrails)
NOT interchangeable with MTDF-PS-A. The Rev A unit is documented as a 2500 W P2C supply for the MCS7500 director. Revision letters in this range denote different wattage, input and airflow combinations, so Rev A and Rev B are not substitutes.
NOT a 1U fixed-switch PSU. MTDF is the director-class chassis spares range. Power supplies for 1U Spectrum and Quantum switches sit in the MTEF-PSR (C2P) and MTEF-PSF (P2C) ranges and are physically different units.
NOT airflow-agnostic. Director chassis populate multiple PSU bays. Every supply in a chassis must share the same airflow direction — mixing directions produces opposing airflow and a thermal fault condition.
NOT a fan module or cable supporter. Those are MTDF-FAN and MTDF-CP part numbers respectively.
NOT confirmed for any specific chassis model from this listing alone. Request written confirmation of chassis fitment before ordering.
NOT supplied with power cords, blanking panels, or mounting accessories.
Compatibility & Hard Constraints
Before ordering: tell us your director chassis model and the part number of the PSUs currently installed. We will confirm from the rating label that the MTDF-PS-B units in stock match your wattage, input type and airflow direction. We will not quote a PSU against an assumed specification.
Airflow is the critical check: all power supplies and fan modules within one director chassis must share airflow direction. A mismatched spare will either be rejected by chassis management or create a hot spot.
Wattage matching: mixing wattages across PSU bays in a redundant configuration is generally unsupported and can invalidate the N+N or N+1 redundancy the chassis is designed for.
Firmware: chassis management firmware reads PSU inventory data. Very old or very new revisions may report as unsupported on a given firmware level — verify before scheduling the swap.
Hot-swap procedure: follow the chassis vendor sequence. Removing a supply while the remaining units are already near capacity will trip the chassis.
Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MTDF-PS-B?
The MTDF-PS-B is a hot-swap spare power supply unit for NVIDIA Mellanox director-class modular switch chassis, revision B, held in New condition by T.E.S IT-SOLUTIONS.
Q. What wattage is the MTDF-PS-B?
This listing does not state a wattage for the MTDF-PS-B. Wattage, input type and airflow differ across MTDF-PS revisions, so we read the rating label on the units in stock and state the confirmed figures in writing on the quotation.
Q. Is the MTDF-PS-B the same as MTDF-PS-A?
No. MTDF-PS-A is documented as a 2500 W P2C supply for the MCS7500 director. Revision letters denote different wattage, input and airflow combinations, so the two are not interchangeable.
Q. Why does airflow direction matter on a chassis power supply?
A director chassis holds several power supplies and fan modules, and they must all move air the same way. Fitting a supply with the opposite airflow creates opposing flow inside the chassis and a thermal fault. Once the MTDF-PS-B units are identified we state their airflow direction on the quotation.
Q. Can I mix wattages across PSU bays?
Generally no. Redundant power configurations expect matched supplies, and mixing wattages can invalidate the N+N or N+1 redundancy the chassis was designed around. Confirm against your chassis documentation.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
New, factory-sealed. Every MTDF-PS-B unit is identified against its own rating and OPN label, and the confirmed wattage, input and airflow are stated in writing on the quotation. EU stock with worldwide express B2B options.
Why T.E.S IT-SOLUTIONS
Every unit ships with: (1) verification against the physical rating and OPN label, (2) full cosmetic inspection, (3) professional packaging for rack components, (4) global B2B shipping from EU stock, (5) technical consultation on chassis fitment, wattage matching and airflow direction at no extra cost. See tes-itsolutions.com.