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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

  • 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.

Highlights

  • 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

Specifications

BrandDELL
Model3HC75
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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