1. Introduction
This manual provides detailed instructions for the Phanteks Eclipse P400A Digital ATX Mid-tower chassis. It covers essential information regarding the product's features, setup, operation, and maintenance to ensure optimal performance and longevity. The Eclipse P400A is designed for high airflow and features a full metal mesh front panel, tempered glass side panel, and integrated Digital-RGB lighting.
2. Key Features
- Optimal Cooling Performance: Features an ultra-fine performance mesh front panel for maximum airflow and a tempered glass side panel.
- Spacious Interior: Supports up to E-ATX motherboards, 280/360mm radiators in the front, and vertical GPU mounting (with optional bracket PH-VGPUKT_02).
- Integrated Digital-RGB Controller: Includes three pre-installed D-RGB fans that can sync with compatible motherboards for customizable lighting effects.
- Extensive Storage Options: Provides six HDD positions (two trays included) and eight SSD mounting locations (two dedicated brackets included).
- Easy Accessibility I/O: Front panel includes 2x USB 3.0 ports, microphone and headphone jacks, power button, reset button, and D-RGB controller.
3. Setup and Installation
Before beginning installation, ensure all components are accounted for and refer to your motherboard and component manuals for specific installation procedures. Always handle components with care and use anti-static precautions.
3.1 Unpacking the Chassis
Carefully remove the chassis from its packaging. Inspect for any damage during transit. Retain the packaging for future transport or storage.

Figure 3.1: Phanteks Eclipse P400A Digital ATX Mid-tower (White)
3.2 Removing Side Panels
The tempered glass side panel is secured with thumbscrews. Carefully unscrew these and gently remove the panel. The opposite side panel can also be removed for cable management access.
3.3 Motherboard Installation
- Install the I/O shield into the rear opening of the chassis.
- Align your ATX, micro-ATX, or mini-ITX motherboard with the pre-installed standoffs. For E-ATX motherboards up to 272mm wide, ensure optional HDD trays are not in use.
- Secure the motherboard with the provided screws.
3.4 Component Installation
- Graphics Card (GPU): Install your graphics card into the appropriate PCIe slot on the motherboard. The case supports GPUs up to 420mm in length. Vertical GPU mounting is supported with the optional PH-VGPUKT_02 bracket.
- CPU Cooler: Install your CPU cooler. The case accommodates CPU coolers up to 160mm in height.
- Storage Drives: Utilize the dedicated SSD brackets and HDD trays for 2.5-inch and 3.5-inch drives respectively. The case offers extensive storage options with 6x HDD and 8x SSD mounting locations.
- Power Supply Unit (PSU): Install the PSU in the designated compartment. The PSU clearance is 270mm.
3.5 Cable Management
The chassis provides 25mm of space for cable management behind the motherboard tray. Utilize the included velcro ties and routing channels to organize cables for improved airflow and aesthetics.
Video 3.5.1: An official Phanteks video showcasing the Eclipse P400A chassis, highlighting its design, airflow, and RGB lighting features. This video provides a visual overview of the case's capabilities and aesthetic appeal.
4. Operation
4.1 Front I/O Panel
The top front panel provides convenient access to essential controls and ports:
- Power Button: Press to power on or off your system.
- Reset Button: Press to restart your system.
- USB 3.0 Ports (x2): Connect USB 3.0 compatible devices for high-speed data transfer.
- Microphone Jack: Connect your microphone.
- Headphone Jack: Connect your headphones or speakers.
- D-RGB Controller Buttons: Used to cycle through various Digital-RGB lighting modes and colors for the pre-installed fans and compatible D-RGB products.

Figure 4.1: Front I/O Panel Overview
4.2 Digital-RGB Lighting Control
The integrated D-RGB controller allows for direct control of the lighting effects. Alternatively, if your motherboard supports Digital-RGB synchronization, you can connect the case's D-RGB cables to your motherboard's header and control lighting via motherboard software.
5. Maintenance
5.1 Cleaning Dust Filters
To maintain optimal airflow and cooling performance, regularly clean the dust filters. The front mesh panel is designed for easy removal and cleaning. Other filters, such as those for the top and bottom fan mounts, should also be checked and cleaned periodically.
- Gently pull the front mesh panel to detach it.
- Use a soft brush or compressed air to remove accumulated dust.
- Reattach the panel securely.
5.2 General Cleaning
Wipe the exterior surfaces of the chassis with a soft, damp cloth. Avoid using harsh chemicals or abrasive materials that could damage the finish or tempered glass.
6. Troubleshooting
- Fans Not Spinning/RGB Not Lighting Up:
- Ensure all fan power cables are securely connected to the motherboard fan headers or a fan controller.
- Verify that the D-RGB cables are correctly connected to the integrated controller or the motherboard's D-RGB header.
- Check your motherboard's BIOS/UEFI settings or RGB software for fan speed and lighting control.
- Poor Airflow/High Temperatures:
- Clean all dust filters, especially the front mesh panel.
- Ensure fans are oriented correctly for optimal intake and exhaust.
- Verify that there are no obstructions to airflow inside the case, such as poorly managed cables.
- Front I/O Ports Not Functioning:
- Check that all front panel connectors (USB, audio, power, reset) are correctly plugged into the corresponding headers on your motherboard.
Video 6.1: A user-generated video demonstrating the Phanteks Eclipse P400A Digital ATX Mid-tower, focusing on its internal components, RGB lighting, and overall build. This video provides a practical look at the case in use.
7. Specifications
| Feature | Detail |
|---|---|
| Model Name | Phanteks Eclipse P400A Digital White |
| Item Model Number | PH-EC400ATG_DWT01 |
| Case Type | Midi Tower |
| Motherboard Compatibility | ATX, Micro-ATX, Mini-ITX, E-ATX (up to 272mm wide with optional HDD trays removed) |
| Material | Alloy Steel, Tempered Glass |
| Color | White |
| Item Weight | 15.43 pounds (approx. 7 kg) |
| Product Dimensions (LxWxH) | 18.5 x 8.3 x 18.3 inches (approx. 470 x 210 x 465 mm) |
| CPU Cooler Height Clearance | 160 mm |
| GPU Length Clearance | 420 mm |
| PSU Length Clearance | 270 mm |
| Cable Management Space | 25 mm |
| Cooling Method | Air |
| Fan Size | 120 Millimeters (pre-installed) |
| Front Radiator Support | Up to 360mm (130x420x115mm) or 280mm (145x325mm) |
| Top Radiator Support | Up to 240mm |
| Rear Radiator Support | 120mm |
| Internal 3.5" Drive Bays | 6 (2 included) |
| Internal 2.5" Drive Bays | 8 (2 dedicated brackets included) |
| Front I/O | 2x USB 3.0, Mic, Headphone, Power Button, Reset Button, D-RGB Controller |
8. Warranty and Support
Specific warranty details are not provided in this document. For warranty information, technical support, or further assistance, please visit the official Phanteks website or contact their customer service directly. Ensure you have your product model number (PH-EC400ATG_DWT01) and proof of purchase available when seeking support.
Official Phanteks Website: www.phanteks.com





