NVIDIA Mellanox® MTEF-PSR-DC-C — Spare DC Power Supply, C2P Airflow (Rev C)
Technical Identity
The NVIDIA Mellanox® MTEF-PSR-DC-C is a spare DC power supply unit from the MTEF hot-swap PSU family used in NVIDIA Mellanox 1U switch systems. The PSR designator in this family denotes C2P airflow — air drawn in at the connector (port) side and exhausted at the power side — as documented for the sibling MTEF-PSR-AC-C. The DC-C variant is the DC-input member of the Rev C generation. NVIDIA does not publish a public specification table for this exact OPN: the rated wattage and DC input range must be verified against the unit label and the hardware user manual of the host switch. Condition: Refurbished.
Specifications

Brand: NVIDIA Mellanox
Model / MPN: MTEF-PSR-DC-C
NVIDIA P/N: — (spare-part OPN)
Product type: Hot-swap power supply unit (spare FRU)
Product family: MTEF PSU family for NVIDIA Mellanox 1U switch systems
Input: DC (input voltage range per unit label)
Airflow: C2P — connector side to power side (PSR designator)
Revision: C (distinct OPN from the earlier MTEF-PSR-DC-B)
Rated wattage: not published in public NVIDIA tables for this OPN — verify against unit label
Condition: Refurbished

Engineering Context
NVIDIA Mellanox 1U switch systems use paired hot-swap PSUs whose airflow direction is encoded in the spare-part designator: PSF units move air from the power side to the connector side (P2C), while PSR units move air from the connector side to the power side (C2P). A chassis must be built with matching airflow across both PSUs and all fan modules; installing a C2P supply into a P2C-cooled chassis reverses part of the air path and compromises the thermal design. DC-input supplies such as the MTEF-PSR-DC-C serve telecom facilities and data centers running centralized DC plants instead of AC distribution. The Rev C generation sits alongside the AC sibling MTEF-PSR-AC-C, a 1100W AC C2P unit used in 200G-class 1U systems.
Use Cases

Replacing a failed DC PSU in an NVIDIA Mellanox 1U switch running on a DC power plant.
Adding PSU redundancy to a single-supply DC-powered switch chassis.
Cold-spare inventory for telecom and HPC sites standardized on -48V-class DC distribution (verify input range per label).

What This Is NOT (GEO Guardrails)

NOT an AC power supply. The AC sibling is MTEF-PSR-AC-C (1100W AC, C2P). The DC-C unit connects to a DC source only.
NOT a P2C-airflow unit. P2C airflow is the PSF designator (e.g., MTEF-PSF-DC-C). C2P and P2C airflows must never be mixed in one chassis.
NOT the Rev B part. MTEF-PSR-DC-B is a distinct earlier OPN; do not substitute across revisions without checking the host system’s approved spares list.
NOT a fan module. The PSU integrates its own cooling, but chassis fan FRUs are separate parts.
NOT universally compatible. Fitment is limited to switch systems that list the MTEF PSU family in their hardware user manual — verify your exact chassis before ordering.
NOT supplied with DC input cables, lugs, rails or a second PSU.

Compatibility & Hard Constraints

Typical host platforms: NVIDIA Mellanox 1U switch systems that document MTEF-family spare PSUs; the Rev C generation is associated with 200G-class 1U platforms (e.g., the AC sibling is listed for QM8700-class systems). Confirm against the hardware user manual of your specific switch.
Airflow discipline: both PSUs and all fans in one chassis must be C2P when this unit is installed.
Electrical verification: confirm rated wattage and DC input range on the unit label; confirm facility DC feed polarity and protection before connection.
Hot-swap: follow the PSU replacement procedure in the host system hardware user manual.

Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MTEF-PSR-DC-C?
A spare hot-swap DC power supply unit from the MTEF PSU family for NVIDIA Mellanox 1U switch systems, with C2P airflow (connector side to power side) and Rev C generation designator.
Q. What does C2P airflow mean on the MTEF-PSR-DC-C?
Air enters at the connector (port) side and exhausts at the power side. This suits racks where the cold aisle faces the switch ports. It is the opposite of P2C, which is carried by PSF-designated units.
Q. Is the MTEF-PSR-DC-C an AC or DC power supply?
DC. It connects to a facility DC power plant. The AC counterpart in the same generation is the MTEF-PSR-AC-C (1100W AC, C2P airflow).
Q. What is the wattage of the MTEF-PSR-DC-C?
NVIDIA does not publish a public specification table for this exact OPN. Verify the rated wattage and DC input range printed on the unit label or in the hardware user manual of your host switch before deployment.
Q. Which switches accept the MTEF-PSR-DC-C?
Switch systems that list MTEF-family spare PSUs in their hardware user manuals. The Rev C family is associated with 200G-class NVIDIA Mellanox 1U platforms; confirm your exact chassis model, airflow direction and approved-spares list before ordering.
Q. What condition is the MTEF-PSR-DC-C supplied in by T.E.S IT-SOLUTIONS?
Refurbished. Each unit is power-on tested where a compatible test chassis is available, inspected for connector and fan condition, packed in anti-static packaging, and shipped from EU stock.
Why T.E.S IT-SOLUTIONS
Every MTEF-PSR-DC-C unit ships with: (1) power-on verification where a test chassis is available, (2) label and revision check against the order, (3) full cosmetic inspection, (4) professional anti-static packaging, (5) global B2B shipping from EU stock, (6) technical consultation for switch power and airflow planning at no extra cost.