PC Power Receptacle: Understanding the C14 Inlet on Your Case
Quick answer / TL;DR: The PC power receptacle is the inlet on the case rear that the power cord plugs into. On the large majority of desktops it is the C14 receptacle from the IEC 60320 family, which takes a C13 cord. It is keyed, rated 10 A at 250 V, and designed to be swapped as a spare part.
PC power receptacle is the term for the socket on the back of a computer case where the power cord enters. Technicians and OEMs use it when the inlet itself – not the cord – is the subject: loose, cracked, or missing from a refurbished unit.
This guide explains which receptacles exist, how the C14 works mechanically, and the decision tree for a failing inlet.
Which Receptacle Is on Your Case?
The C14 receptacle is the wide rectangular inlet with three angled slots, mounted on the case rear panel next to the PSU rocker switch. The smaller rounded C6 receptacle (for a C5 MIDI cord) appears on compact cases. All-in-ones and small form factor units skip the IEC receptacle entirely and use a DC barrel input instead.
Why C14 won the desktop market
The C14/C13 pair offers three conductors including earth, a 10 A 250 V rating, and a positive keying geometry that only fits one way. It became the de facto standard in the IEC 60320 family for equipment drawing meaningful power, which is why essentially every ATX case has one.
Mechanics: How the Receptacle Grips the Plug
Inside the C14 receptacle, three spring contacts hold the C13 plug blades: two for line and neutral, one for earth. The inlet has a strain-relief latch that grips the plug base. A correctly seated plug shows no gap at the base and no wiggle. If the plug rocks, the spring contacts have fatigued – common on cases older than five years with frequent plug cycles.
| Symptom | Likely cause | Action |
|---|
| Plug wiggles in the inlet | Fatigued spring contacts | Replace the receptacle assembly |
| Cracks around the inlet | Heat or mechanical stress | Replace the receptacle and inspect the cord |
| Burn marks on the plug blades | Arcing from a worn contact | Stop use; replace receptacle and check the cord |
| Inlet missing on a refurb unit | OEM stripped the part | Fit a standard C14 inlet plate to the case cutout |
C14 inlet plates and receptacle assemblies are stocked as spare parts; the catalog lists compatible case cutouts and mounting styles.
Replacing a Failing Receptacle
On a DIY case, the C14 inlet is a small screw-mounted module: power off, unplug the cord, disconnect the two or three wires from the PSU, remove the mounting screws, and fit the new inlet. On an OEM prebuilt, the inlet is often soldered or riveted into the rear panel, so replacement means the panel or the PSU section. When in doubt, the safer and usually cheaper path is a new PSU with its own inlet, since the inlet and PSU are one assembly in most prebuilts.
Real-World Applications
Refurb shop: a loose C14 inlet is a standard rework item – replace the inlet plate, re-terminate the wires, and the unit passes inspection. IT fleet: a burned-in C13 plug paired with a fatigued receptacle is the failure combination that takes out a workstation, so keep spares of both. Home builder: if a used case has a cracked inlet, price the fix against a new case before committing to the project.
Related reading: Plug-side counterpart: computer power plug types — computer-power-plug-types
Related reading: Matching C13 to C14, C5 to C6, C7 to C8 — pc-power-plug-match
Frequently Asked Questions
What is a PC power receptacle?
It is the inlet on the back of a computer case where the power cord plugs in. On most desktops it is the C14 receptacle from the IEC 60320 family, which accepts a C13 cord and is rated 10 A at 250 V with an earth connection.
How do I know if my PC power receptacle is failing?
Watch for a plug that wiggles or does not seat flush, cracks forming around the inlet, and discoloration or burn marks on the plug blades. All three point to fatigued spring contacts or arcing; the receptacle should be replaced before it becomes a fire risk.
Can I replace just the C14 inlet on a case?
On DIY cases, yes – it is a small screw-mounted module with two or three wires. On OEM prebuilts the inlet is usually part of the PSU or rear panel assembly, so replacement means the PSU or the panel. Check which style your case uses before ordering the part.
Does the PC power receptacle matter for surge protection?
Indirectly, yes. A healthy earth path through the receptacle is what lets surge protection and grounding do their job. A worn inlet with a poor earth contact degrades the protection of everything else on the circuit, which is why a loose plug should be fixed promptly.
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