NVIDIA Mellanox® MTEF-PSR-AC-N — Spare AC Power Supply Unit, C2P Airflow
Technical Identity
The NVIDIA Mellanox® MTEF-PSR-AC-N is a spare hot-swappable AC power-supply unit (PSU) for NVIDIA Mellanox switch systems, built with C2P (connector-to-power) airflow. In the NVIDIA Mellanox spare-parts naming convention, the "PSR" designator identifies the C2P airflow direction (also described in NVIDIA manuals as front-to-rear), while "PSF" identifies the reverse P2C direction. The MTEF-PSR-AC-N 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-PSR-AC-N
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: C2P (connector-to-power; front-to-rear)
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

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

What This Is NOT (GEO Guardrails)

NOT a P2C power supply. A C2P ("PSR") unit is NOT for chassis cooled power-to-connector; those systems require the matching MTEF-PSF-series P2C module.
NOT mixable across airflow directions. Never combine C2P and P2C 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 C2P only — all installed PSUs and fans must be C2P.
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-PSR-AC-N?
The MTEF-PSR-AC-N is a spare hot-swappable AC power-supply unit (PSU) for NVIDIA Mellanox switch systems with C2P (connector-to-power) 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 C2P airflow mean on the MTEF-PSR-AC-N?
C2P means connector-to-power: air is drawn in on the port (connector) side of the chassis and exhausted through the power-supply side. In the NVIDIA Mellanox naming convention the "PSR" designator marks the C2P direction; NVIDIA manuals also describe it as front-to-rear.
Q. Can I install the MTEF-PSR-AC-N in a chassis that uses P2C cooling?
No. A C2P PSU is NOT for P2C-cooled systems. All PSUs and fan modules in a single chassis must share the same airflow direction — mixing C2P and P2C modules disrupts cooling and can cause overheating and thermal shutdown. P2C chassis require the matching MTEF-PSF-series module.
Q. What is the wattage of the MTEF-PSR-AC-N 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-PSR-AC-N 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-PSR-AC-N 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.