HS Electronics HN-200C 200W AT Power Supply 12-Pin XT Style Rear Switch 115V

HS Electronics HN-200C 200W AT Power Supply 12-Pin XT Style Rear Switch 115V

The HS Electronics HN-200C is a 200-watt AT-form-factor power supply designed for vintage IBM XT, IBM AT, and compatible desktop PC systems. It uses the classic split 12-pin AT motherboard connector (P11/P12) and features a rear-mounted rocker power switch — the standard configuration for AT-class machines before ATX became the norm in the mid-1990s. Input is switchable between 115V and 230V AC at 50/60 Hz.

Specifications & What's Included

• Model: HS Electronics HN-200C
• Maximum output power: 200W
• Input: AC 115V / 5A or AC 230V / 2.5A, 50/60 Hz
• Output rails: +12V, -12V, +5V, COM
• Output current (+12V): 1.00A (P12 connector), 2.80A (P11/P10 connectors), 2.80A (P9 connector)
• Output current (+5V): 1.00A / 1.80A / 1.80A across connector groups; P9 rail: 3.80A
• Motherboard connector: 12-pin AT (split P11 + P12 plugs)
• Peripheral connectors: multiple Molex 4-pin drive power connectors
• Power switch: rear-mounted rocker switch (XT/AT style)
• Cooling: dual top-mounted fans
• Form factor: AT
• Country of manufacture: South Korea
• Includes: power supply unit with full output harness

Applications

AT-style power supplies like the HN-200C were the standard for IBM PC/XT and PC/AT compatible desktop computers from roughly the mid-1980s through the mid-1990s, before the ATX standard replaced them around 1995–1996. They are distinguished by the split 12-pin motherboard connector (two 6-pin plugs snapped together), the rear-panel power switch wired directly into the AC line, and the absence of a soft standby rail. Today these units are used primarily for maintaining, restoring, or upgrading vintage IBM XT and AT machines, early 286/386/486-era clones, and other retro PC hardware that requires the AT form factor and connector pinout. They are also sought by collectors and hobbyists working with vintage computing platforms.