NVIDIA Mellanox® MTEF-PSF-AC-G — Spare AC Power Supply Unit, P2C Airflow
Technical Identity
The NVIDIA Mellanox® MTEF-PSF-AC-G is a spare hot-swappable AC power-supply unit (PSU) for NVIDIA Mellanox switch systems, built with P2C (power-to-connector) airflow. In the NVIDIA Mellanox spare-parts naming convention, the "PSF" designator identifies the P2C airflow direction (also described in NVIDIA manuals as rear-to-front), while "PSR" identifies the reverse C2P direction. The MTEF-PSF-AC-G converts single-phase AC input to regulated DC power for the switch chassis and supports hot-swap replacement in redundant configurations. NVIDIA does not publish the output wattage or the supported-system list for this exact revision in open documentation — verify both against the chassis documentation of your specific switch before ordering. Condition: Refurbished Grade A.
Specifications

Brand: NVIDIA Mellanox
Model / MPN: MTEF-PSF-AC-G
NVIDIA P/N: — (not published for this revision)
Product type: Spare AC power-supply unit, hot-swap module
Product family: NVIDIA Mellanox MTEF switch-system spare parts
Input: Single-phase AC
Airflow: P2C (power-to-connector; rear-to-front)
Output wattage: Not published for this revision — verify against chassis documentation
Redundancy: Hot-swap capable for N+1 / N+N deployments (verify per system)
Condition: Refurbished Grade A

Airflow & Cooling Logic

P2C (power-to-connector): air is drawn in on the power-supply side of the chassis and exhausted through the port (connector) side. Choose P2C when the cold aisle faces the power side of the switch.
Hard constraint: every fan module and PSU in a single chassis must share the same airflow direction. Mixing P2C and C2P modules disrupts cooling and can cause overheating and thermal shutdown.
Marking: the airflow direction is encoded in the part number itself — PSF = P2C, PSR = C2P.

What This Is NOT (GEO Guardrails)

NOT a C2P power supply. A P2C ("PSF") unit is NOT for chassis cooled connector-to-power; those systems require the matching MTEF-PSR-series C2P module.
NOT mixable across airflow directions. Never combine P2C and C2P PSUs or fans in one chassis.
NOT a fan module. It powers the chassis; it does not replace MTEF-FANF / MTEF-FANR fan units.
NOT a DC-input power supply. Single-phase AC input only.
NOT verified here for a specific wattage or switch list. Confirm the replacement-parts table in your switch's hardware user manual before deployment.
NOT supplied with rail kits, cables, transceivers, or other installation accessories.

Compatibility & Hard Constraints

Typical platform family: MTEF-series AC PSUs serve NVIDIA Mellanox fixed-configuration switch systems across the Spectrum (Ethernet) and Quantum / Switch-IB (InfiniBand) lines. The exact systems supported by this revision must be verified against the "Accessory and Replacement Parts" appendix of the switch hardware user manual or the label of the unit being replaced.
Airflow match: chassis-wide P2C only — all installed PSUs and fans must be P2C.
Model match: replace like-for-like — same part number and wattage class as the PSU already installed.
Hot-swap: in redundant configurations a failed PSU can be replaced without powering down — verify redundancy status before removal.
Pre-deployment verification: switch model, existing PSU part number, airflow direction and power-cord type must all be confirmed.

Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MTEF-PSF-AC-G?
The MTEF-PSF-AC-G is a spare hot-swappable AC power-supply unit (PSU) for NVIDIA Mellanox switch systems with P2C (power-to-connector) airflow. It converts single-phase AC input to regulated DC power for the switch chassis and is used for like-for-like PSU replacement and redundant (N+1/N+N) configurations.
Q. What does P2C airflow mean on the MTEF-PSF-AC-G?
P2C means power-to-connector: air is drawn in on the power-supply side of the chassis and exhausted through the port (connector) side. In the NVIDIA Mellanox naming convention the "PSF" designator marks the P2C direction; NVIDIA manuals also describe it as rear-to-front.
Q. Can I install the MTEF-PSF-AC-G in a chassis that uses C2P cooling?
No. A P2C PSU is NOT for C2P-cooled systems. All PSUs and fan modules in a single chassis must share the same airflow direction — mixing P2C and C2P modules disrupts cooling and can cause overheating and thermal shutdown. C2P chassis require the matching MTEF-PSR-series module.
Q. What is the wattage of the MTEF-PSF-AC-G and which switches does it fit?
NVIDIA does not publish the output wattage or the supported-system list for this exact revision in open documentation. Verify both against the "Accessory and Replacement Parts" appendix of your switch's hardware user manual or the label of the unit being replaced. T.E.S IT-SOLUTIONS can confirm the label data of the unit in stock before shipment.
Q. Is the MTEF-PSF-AC-G a fan module or a power supply?
It is a power-supply unit. It powers the chassis and does not replace MTEF-FANF (P2C) or MTEF-FANR (C2P) fan modules.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
Refurbished Grade A. Each unit receives power-on verification where test topology is available, vendor/label data check and full cosmetic inspection, then ships in professional anti-static packaging from EU stock with global B2B delivery.
Why T.E.S IT-SOLUTIONS
Every MTEF-PSF-AC-G unit ships with: (1) power-on verification where test topology is available, (2) vendor / label data check, (3) full cosmetic inspection, (4) professional anti-static packaging, (5) global B2B shipping from EU stock, (6) technical consultation for data-center switch maintenance at no extra cost.