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Dell 3HC75 reverse-airflow PSU fan module for S4048-ON rack switches

DELL

DELL 3HC75 Power Supply Reverse Airflow S4048-ON

SKU CH-890Q-E7HAX MPN 3HC75

Reverse-airflow power supply for Dell S4048-ON and compatible network switches

  • Product typeRack
  • Reverse airflow cools Dell S4048-ON switches efficiently
  • Hot-swap PSU-to-I/O design keeps rack temperatures stable
  • Compatible with S4048-ON and N2224X-ON series hardware
  • Part number 3HC75 matches Dell CAT-29035 specification
  • New condition ensures reliable operation from day one

Reverse Airflow PSU for S4048-ON

The Dell 3HC75 is a rack-mount power supply designed for reverse airflow, moving air from the PSU side toward the I/O ports. It is built for network environments that require this specific cooling direction.

Network engineers using compatible Dell switches

This unit suits administrators deploying or maintaining the listed Dell switches that require PSU-to-I/O airflow. It is not for operators whose chassis demand front-to-back or I/O-to-PSU airflow direction.

PSU-to-I/O reverse airflow direction

The defining specification is the reverse airflow path, which must match the switch chassis design. Installing a unit with the wrong airflow orientation will compromise thermal management.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $34.99
Cheaper than about 94% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Brand nameDELL
Model name3HC75
Product typeRack

Questions about this item

How often does the internal fan in the 3HC75 need replacement under continuous operation?

The 3HC75 uses a sealed fan module rated for long-life operation; no user-serviceable schedule is published.

What thermal limit triggers throttling on the 3HC75 when the S4048-ON runs at full load?

The unit relies on the switch chassis thermal sensors; it has no independent throttle point.

What is the typical acoustic output of the 3HC75 when the S4048-ON runs 24/7?

Reverse airflow moves heat toward the I/O side; noise matches the switch fan curve at equivalent RPM.

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