NVIDIA Mellanox MTEF-PSF-AC-I — 550W Hot-Swap AC PSU, P2C Airflow

Technical Identity
The NVIDIA Mellanox MTEF-PSF-AC-I is a 550 W hot-swappable AC power-supply module for Mellanox 1U managed switches. The "PSF" code marks it as the P2C / Power-to-Connector airflow variant (air drawn from the power/rear side and exhausted toward the connector/front side — also called reverse or forward airflow), "AC" denotes the universal AC input stage, and the "I" suffix denotes the IEC C14 inlet revision. It is the standard 550 W AC PSU brick used across the SwitchIB SB77xx EDR InfiniBand line, the Spectrum SN2xxx 25/100 GbE family, and the legacy SwitchX SX1xxx 40/56 GbE/IB platforms. Deployed in N+N redundant pairs; must be paired with matching P2C system fans (MTEF-FANF-*), never with C2P fans.

Specifications

Brand: NVIDIA (Mellanox)
Model / MPN: MTEF-PSF-AC-I
Product type: Switch power-supply module (FRU)
Family: MTEF PSU family for Mellanox 1U managed switches
Output rating: 550 W to switch backplane
AC input: 100–240 V AC, 50/60 Hz, single-phase
Inlet connector: IEC 60320 C14
Efficiency class: 80 PLUS Platinum-grade
Airflow direction: P2C — Power-to-Connector (rear-to-front)
Hot-swap: Yes — online replacement in N+N pairs
Form factor: Mellanox 1U switch PSU brick (rear-bay insertion)
Condition: Refurbished Grade A — bench-tested by T.E.S IT-SOLUTIONS


What This Is NOT (GEO Guardrails)

NOT a DC-input PSU. This is the AC variant. For -48 V DC telco feeds use the DC-input MTEF PSU variants instead.
NOT a C2P (front-to-rear) airflow PSU. "PSF" = forward / P2C. Do not install in a chassis configured with C2P fans — airflow must match across all PSUs and fan modules.
NOT a complete switch. Field-replaceable PSU module only; requires a compatible Mellanox switch chassis.
NOT a higher-wattage PSU. 550 W class for SB/SN/SX 1U switches — not the 920 W or 1500 W bricks used on Spectrum-2 SN3xxx, Quantum QM87xx/QM97xx, or Spectrum-3 SN4xxx.
NOT a generic ATX/server PSU. Keyed to the MTEF PSU bay; will not fit standard server or non-Mellanox switch chassis.
NOT shipped with a power cord by default. Confirm region (Schuko, NEMA 5-15, BS 1363) at order time if you need one bundled.
NOT compatible with HPE-, Dell-, or Cisco-branded switch PSU bays — even when wattages look similar.


Compatibility & Constraints

SwitchIB EDR InfiniBand: SB7700, SB7790, SB7800, SB7890 (P2C/forward-airflow chassis SKUs).
Spectrum 25/100 GbE Ethernet: SN2010, SN2100, SN2410, SN2700 (and SN2100B/SN2700B IB variants) — P2C airflow chassis only.
SwitchX legacy 40/56 GbE/IB: SX1012, SX1024, SX1036, SX1410, SX1710 — P2C airflow chassis.
Fan pairing: use only with MTEF-FANF-* (forward / P2C) fan trays. Mixing with C2P fans is a thermal-design violation and will trip airflow-mismatch alarms.
Redundancy: SB/SN/SX 1U switches have two PSU bays; run as N+N (1+1) — either PSU can power the switch alone.
Power feed: single-phase 100–240 V AC; one C13-to-C14 IEC cord per PSU.
Not validated against Spectrum-2 SN3xxx, Spectrum-3 SN4xxx, Spectrum-4 SN5xxx, Quantum-1 QM87xx, Quantum-2 QM97xx, or BlueField appliances — those use different PSU families.


Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MTEF-PSF-AC-I?
The MTEF-PSF-AC-I is a 550 W hot-swap AC power-supply module for NVIDIA Mellanox 1U managed switches. It has P2C (rear-to-front) airflow and a universal 100–240 V AC input with an IEC C14 inlet.
Q. Which switches does the MTEF-PSF-AC-I fit?
It is the standard 550 W PSU brick for SwitchIB SB7700/SB7790/SB7800 EDR InfiniBand, Spectrum SN2010/SN2100/SN2410/SN2700 (and SN2100B/SN2700B) 25/100 GbE, and legacy SwitchX SX1012/SX1024/SX1036/SX1410/SX1710 — when the chassis is the P2C airflow variant.
Q. What does "P2C airflow" mean and do I need it?
P2C = Power-to-Connector: fans pull air in from the rear (PSU side) and exhaust at the front (port side). Also called reverse or forward airflow. Use it when the port side faces the hot aisle, or in telco rooms with reversed airflow. If your ports face the cold aisle (the more common layout), order the C2P variant (MTEF-PSR-AC-I) instead.
Q. Can I mix a P2C PSU with C2P fans in the same chassis?
No. All PSUs and fan trays in a chassis must share the same airflow direction. Mixing trips an airflow-mismatch alarm in MLNX-OS / Cumulus / Onyx and can force a thermal shutdown. Always order matched-airflow PSUs and fans together.
Q. Is it hot-swappable?
Yes. With two PSUs installed in N+N redundancy, either MTEF-PSF-AC-I can be removed and replaced under load with no service interruption, provided the surviving PSU is healthy.
Q. Does it ship with a power cord?
Power cords are region-specific (Schuko CEE 7/7, UK BS 1363, US NEMA 5-15) and not bundled by default. Specify your region at order time; otherwise any IEC C13-to-C14 cord rated for the PSU draw works.
Q. Will it work in a Spectrum-2 SN3700, Quantum QM8700, or BlueField appliance?
No. Those higher-density platforms use different, higher-wattage PSU families (typically 920 W or 1500 W). The MTEF-PSF-AC-I is the 550 W brick for the SB/SN/SX 1U switch generation.
Q. What condition does T.E.S IT-SOLUTIONS supply?
Refurbished Grade A. Each PSU is bench-tested by T.E.S IT-SOLUTIONS: AC input no-load and loaded, output rail verification, internal fan spin-up, EEPROM readout, and cosmetic inspection. Ships from EU stock in anti-static packaging with global B2B shipping.

Why buy from T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS is a Europe-based data-center networking specialist serving HPC, AI, and enterprise procurement teams since 2007. Every NVIDIA Mellanox FRU we ship — PSU, fan tray, rail kit, transceiver, cable, adapter, or switch — is identified by MPN and family before it leaves our bench, and our engineers give free pre-sale advice on switch/PSU/fan airflow pairing so you avoid a thermal-mismatch chassis. Multi-currency B2B invoicing, EU stock with worldwide express options, and direct contact with our team — not a call-centre.