Description
RU 8631 AT XT Vintage PC Power Supply 115/230V External Switch 101-6906-25
The RU 8631 is an AT/XT-style desktop PC power supply in the classic box format used by early IBM-compatible personal computers. It features an external rocker-style power switch — a hallmark of AT-era PC design, where the power switch was a separate component wired to the supply rather than integrated into a front-panel button as in later ATX systems. Input is switchable between 115V and 230V AC at 50–60 Hz, making it compatible with both North American and international systems. Part number 101-6906-25 is printed on the output rating label.
Specifications & What's Included
- Model: RU 8631
- Part Number: 101-6906-25
- Input Voltage: 115/230V AC, 50–60 Hz (switchable)
- Output +5V: 15A DC
- Output +12V: 4.2A DC
- Output –12V: 0.4A DC
- Power Switch: External rocker-style switch (AT design)
- AC Inlet: IEC C14 socket
- Output Connectors: AT-style multi-pin Molex harness cables (two connectors visible)
- Cooling: Internal fan mounted on top of chassis
- Enclosure: Zinc-plated steel box chassis
- Certifications: UL listed (UL mark visible on chassis)
Applications
AT and XT power supplies like the RU 8631 powered the first generation of IBM PC-compatible desktop computers from the early-to-mid 1980s through the early 1990s. The AT form factor defined the standard for PC power supplies during this era, delivering the +5V, +12V, and –12V rails that IBM PC, PC/XT, and PC/AT motherboards and peripherals required. The external switch design — where a high-current rocker switch on the power supply itself controlled mains power — was standard on all AT-class systems before the ATX specification introduced soft-switching in the mid-1990s. Today, units like this are sought by vintage computer restorers and collectors maintaining working IBM PC, XT, AT, and compatible clone systems, as well as by industrial users running legacy embedded or control systems that still use AT-style PSUs. The +5V/15A and +12V/4.2A output ratings are typical of mid-range AT supplies adequate for a single hard drive, floppy drives, and a full complement of ISA expansion cards.
This RU 8631 AT/XT-style vintage PC power supply has been inspected and is in good used condition. It was pulled from a working environment where it was in use and functional. The metal enclosure shows typical light wear consistent with age and prior use, including some surface scuffing and minor discoloration on the zinc-plated chassis. The external rocker power switch, IEC AC inlet, cooling fan, and output harness cables all appear intact and undamaged. Please view our photo set and contact us if you have any questions.
Warranty Information
Additional Information
Brand: |
Unbranded |
Model: |
RU 8631 |
MPN: |
101-6906-25 |
SKU: |
34647 |
Type: |
AT/XT Desktop PC Power Supply |
Form Factor: |
AT/XT (External Power Switch) |
Input Voltage: |
115/230V AC, 50-60Hz |
Output +5V: |
+5V, 15A DC |
Output +12V: |
+12V, 4.2A DC |
Output -12V: |
-12V, 0.4A DC |
Output Connector: |
AT-style multi-pin Molex connectors |
Cooling: |
Internal cooling fan |
Power Switch: |
External rocker-style power switch |
AC Inlet: |
IEC C14 AC inlet |
Condition: |
Used – Pulled from Working Environment |
Seller Notes: |
Includes attached power harness cables; external switch intact |
Compatible With: |
AT/XT form factor vintage desktop computers |
Country/Region of Manufacture: |
Unknown |
Condition Notes: |
RU 8631 AT/XT vintage PC power supply. Inspected, in good used condition. Pulled from a working environment where it was in active use. Chassis shows light scuffing and age wear. Switch, fan, AC inlet, and cables intact. |
