Dell 550W Hot-Swap Server Power Supply DC7V4 X185V NCNFF 034X1 6V43G PowerEdge R - Power Supply

Dell 550W Hot-Plug Power Supply DC7V4 / X185V / NCNFF / 034X1 / 6V43G | PowerEdge R330 / R340 / R430 / R440 / R6415 / R6515 (EPP Platinum Hot-Swap)

Key Features

New original Dell 550W hot-plug power supply - designed for Dell PowerEdge rack servers (1U/2U); supports 1+1 redundant configuration.
Dell part numbers: DC7V4 / X185V / NCNFF / 034X1 / 6V43G - same physical unit, interchangeable DPN across supported platforms.
PSU model numbers: D550E-S1 / DPS-550AB-B - Extended Power Performance (EPP) platform, Delta Electronics manufacture.
Form factor: Server hot-swap sled - approx. 203 x 50 x 40 mm; fits standard Dell PowerEdge 1U/2U hot-swap PSU bay.
Connector: Dell proprietary EPP server backplane connector (13th/14th Gen PowerEdge) - NOT compatible with non-EPP backplanes or older 12th Gen (R320/R420) chassis.
550W MAX continuous output - sufficient for fully loaded dual-processor 1U configurations on R430 / R440.
Built-in OVP / OCP / SCP protection - over-voltage, over-current, and short-circuit protection.
Not interchangeable with 12th Gen PowerEdge PSUs (e.g. R320 / R420 L550E-S0 series) - different EPP backplane connector and firmware handshake.

Technical Specifications

Brand	Dell
Condition	New Original (Genuine Dell)
Dell PN	DC7V4 / X185V / NCNFF / 034X1 / 6V43G
PSU Model	D550E-S1 / DPS-550AB-B
Wattage	550W MAX
Efficiency	80 Plus Platinum - 94% efficiency @ 50% load
EPP Label	Extended Power Performance (EPP)
Input Voltage	100-240V AC, 50-60Hz, 7.4-3.7A auto-ranging
Output	+12.2V 45.08A \| +12VSB 3.0A \| 550W MAX
Form Factor	Server hot-swap sled - approx. 203 x 50 x 40 mm (1U/2U Dell rack format)
Connector Type	Dell proprietary EPP server backplane connector (13th/14th Gen PowerEdge)
Hot Plug	Yes - full hot-swap capable (no server power-down required)
Protection	OVP / OCP / SCP (Over-Voltage / Over-Current / Short-Circuit)
Redundancy	Yes - 1+1 N+1 redundancy supported; both PSUs must be identical EPP label type
Server Gen	13th Gen (R430) / 14th Gen (R440, R6415, R6515) / 13th Gen (R330) / 14th Gen (R340)

Compatible Models

Dell PowerEdge Rack Server Series (13th Gen):

Dell PowerEdge Rack Server Series (14th Gen):

Always verify the part number / model number on your existing PSU label before purchasing.

Package Contents

1x Dell 550W Hot-Plug EPP Server Power Supply - DC7V4 / X185V / NCNFF / 034X1 / 6V43G or identical DPN (New Original)

Warranty

3-month replacement warranty
Covers manufacturing defects; physical damage and improper installation not included

Additional Notes

This PSU uses the Dell proprietary EPP backplane connector used in 13th/14th Gen PowerEdge servers - it is NOT compatible with standard ATX connectors or older PowerEdge 12th Gen chassis (R320, R420, R520, R620, R720).
Mixing PSUs from different PowerEdge generations is not supported - even at the same wattage. Mismatch will trigger an iDRAC power supply mismatch error and may prevent the server from powering on.
When installing two PSUs for redundancy, both units must carry the same EPP label type and identical wattage rating (550W). Do not mix with 450W cabled PSUs in the same chassis.
Verify the Dell DP/N label on your existing PSU before ordering - confirm it matches one of: DC7V4 / X185V / NCNFF / 034X1 / 6V43G to ensure a drop-in replacement.
New original unit - genuine factory Dell unit, not refurbished or aftermarket.

Product