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Phanteks Eclipse P400A Mid Tower Gaming Case

Phanteks continues its user friendly design chassis with the new Eclipse Series P400A.

CCL Code: CAS3736
Manufacturer Code: PH-EC400ATG_BK01
Manufacturer: Phanteks
Phanteks Eclipse P400A Mid Tower Gaming Case

Key Features:

  • PSU not included
  • 2 x 2.5", 2 x 3.5" HDD Bay(s)
  • Max MB Size: E-ATX
  • Tempered Glass

Delivery Options

Tuesday 22nd June via Priority DPD

Free Delivery by Monday 28th June

Collection Options

Tomorrow from CCL (BD11 2PS)

Tuesday 22nd June from Local Collection Point


inc VAT

12 In Stock Now

Buying in bulk or need help? Email our Business Team.

The Phanteks Eclipse P400A breathes performance with its full metal mesh front panel. Thanks to engineering improvements we have been able to create an Ultra-Fine Performance Mesh that brings the best possible performance while keeping dust from entering the system.

Strength & Performance

Full-Metal Mesh Front Panel

The single-piece front panel is made from an Ultra-Fine Steel Mesh. This mesh catches dust, adds structure and strength, and is part of the P400A's seamless design.

Improved Airflow

The P400A chassis has improved airflow to keep your system cool. The optimised High Air-flow Mesh Front Design offers maximum cooling performance.

Integrated 3-Speed Fan Controller

The built-in Fan Controller balances noise and performance with the push of a button. Choose the right speed for you: Full, Medium or Low.

Cooling Capacity

The Eclipse P400A has a range of possible fan and radiator locations up to 360mm for both 120mm and 140mm fans.

Storage Capacity

The P400A supports 3 x 3.5" HDDs and 2 x 2.5" SSDs out of the box with easy to use trays and vibration dampening. There is space for an additional four drives with the optional PH-HDDKT_02 brackets.


Internal Expansion Bays 2 x 2.5"
2 x 3.5"


Expansion Slots 7 x Full Height


USB Ports 2 x USB 3.0
Headphone Ports 1 x 3.5mm Jack
Microphone In Port 1 x 3.5mm Jack


Cooling System Front: Supports 3 x 120mm or 2 x 140mm fans (1 x 120mm fan included)
Top: Supports 2 x 120mm or 140mm fans
Rear: Supports 1 x 120mm fan (included)
Power Supply ATX Power Supply supported


Form Factor Mid Tower Case
Case Colour Black
Material Powder Coated Steel
Tempered Glass
Motherboard Compatibility E-ATX
Width 210 mm
Depth 470 mm
Height 465 mm
Weight 7 kg


Warranty 5 Years

Key Features

Firewire No
Main Colour Black
Case Type Tower
USB 3.0 Support Yes
Case Form Factor Mid Tower
Power Supply Included No
Optimised for Gaming
80Plus Rated No
PSU Form Factor ATX
Display Model in Showroom No
L.E.D Fan No LED
Internal 3.5" Bay 2
Internal 2.5" Bay 2
Micro-ATX Yes
Cooler Height 160 mm
Built-in Card Reader No
USB Type-C Support No
Front HDMI No
Side Panel Type Tempered Glass
GPU Length 420 mm
PSU Depth 270 mm
Front Audio Type Separate
Maximum Motherboard Size Supported E-ATX

Item Details

Manufacturer Phanteks
Manufacturer Code PH-EC400ATG_BK01
EAN 0886523301653
UPC 886523301653
Condition New

Warranty Information

Warranty 5 Years

Manufacturer Information

Manufacturer Phanteks
Manufacturer Code PH-EC400ATG_BK01

Do you have you a question about the Phanteks Eclipse P400A Mid Tower E-ATX Case in Black with Tempered Glass?

Q: Will the Corsair RM850 850W Modular 80+ Gold PSU fit in this case?
Answer by Website User on 14th December 2020
Yes, that PSU will fit fine.
0 customers found this answer helpful.
Post Answer
5 / 5 8 reviews

B Blairsdale

5 months ago

Excellent airflow case and keeps the CPU with an NH-D15s ( need an "s" as second fan will not fit) extremely cool under load. Do not worry about GPU space for most larger cards unless you plan to take up all 4 optional drive bays. Overall an excellent case for temps, not flimsy in anyway and certainly not ugly, perfect for my needs as I do not care about pimping out the case. Only downside and I question if it is given the price, a HDD bracket for at least one optional HDD would be nice, though I get the whole keeping it simple and well priced.


5 months ago

Its a good price for the case, can keep everything cool and there is space for 3 fans on the front, really easy to cable manage in and came with cable ties and 2 fans pre-mounted, the only thing is that if you don't use water cooling you end up with a big empty space at the front.

Nathan Stokes

6 months ago

Best case Ive owned. Honestly love it.


10 months ago

Absolutely amazing for 62


10 months ago

Good case with plenty of cooling options. Space for a full length gfx card, acceptable cable management and works well with Asrock B550 motherboard. I dont understand why case manufacturers dont pre-install the io panel. You invariably use it, so why have a separate push in piece?


11 months ago

The price I bought it for was an absolute bargain. The case itself is very very good. Looks great. Great manual. Great airflow. Just very very good

Dave Johnson

June 2020

A good budget option for a case where airflow is important. Build quality seems decent enough and there's plenty of room to work in along with lots of options for fan placement.


November 2019

Great case, looks amazing. Lots of room for working on the inside, and the basement definitely helps hide the cables. Slight bit of flex on the front mesh, meaning that when you move it it sometimes bends inwards, but does snap out again. Would have also liked slightly more space behind the motherboard for cables, as the side panel is quite difficult to get back one once you've routed all of your cables. Overall, lovely case and would recommend.

PDF Datasheets and Manuals

Document File type File size
Manual pdf