Aiphone SKK-620C Power Supply

The Aiphone SKK-620C is a UL Listed 6V DC power supply rated at 200mA, purpose-built to power several Aiphone intercom series that require regulated low-voltage DC rather than the 12V or 24V supplies used by larger system platforms. It converts standard 120V AC input at 50/60Hz to a stable 6V DC output, and its fire-retardant ABS plastic housing meets safety requirements for installation in commercial and residential environments. A 12-inch ground wire connects the unit to earth or electrical ground. This is the updated replacement for the discontinued SKK-620B and ships with the unit and installation manual.

Which Aiphone intercom systems does the SKK-620C power?

The SKK-620C is compatible with a specific set of Aiphone product families that operate on 6V DC: the AT-406 handset intercom, the ChimeCom C-123L/A and C-123LW series, the LEM-1 and LEM-3 master stations, and the TAR-3 tenant stations. These are distinct from Aiphone's larger system platforms such as the JO or IX IP series, which use different power architectures entirely. Getting the power supply wrong on any of these systems creates an immediate problem. Under-voltage starves the unit and causes intermittent operation or failure to initialize. Over-voltage risks damaging the intercom hardware, particularly on the LEM series where the electronics are calibrated tightly around the 6V threshold. The SKK-620C removes that risk by delivering exactly the regulated 6V DC at 200mA that these units require. It's not a universal power supply and it's not intended to be — its value is precision compatibility with the specific Aiphone families listed. For the full range of Aiphone intercom products available on this site, including compatible master and door stations, see the Aiphone brand page.

What does UL Listed mean for a low-voltage power supply?

UL Listed on a power supply means Underwriters Laboratories has tested the unit and confirmed it meets the safety standards set out in UL 60950-1 or the applicable product standard for information technology and audio/video equipment power supplies. For installers and facility managers, this matters because many jurisdictions require UL Listed equipment on commercial intercom installations, and building inspectors or AHJs may reject non-listed components on life-safety or security-related wiring. The fire-retardant ABS housing reinforces this compliance posture: even in the event of internal component failure, the housing resists flame propagation. The SKK-620C's 2-year manufacturer warranty provides additional reassurance on a component that's expected to run continuously in an installed location for years.

Installation requirements and operating conditions for the SKK-620C

The SKK-620C is compact at 2-13/16" H x 2-13/16" W x 1-3/8" D, making it straightforward to install in a wall box, above a ceiling tile, or inside a small enclosure near the intercom master station. Input is 120V AC at 50/60Hz, compatible with standard North American outlets. Operating temperature range is 32°F to 104°F (0°C to 40°C), covering typical indoor commercial and residential environments but not unheated exterior enclosures in cold climates. The included 12-inch ground wire should be connected to earth ground or the electrical panel ground to suppress interference and protect the intercom circuitry from voltage spikes on the AC line. For facilities pairing Aiphone intercom systems with electronic access control at the same entry points, the keypad and proximity lock options available on this site integrate cleanly with the LEF and LEM intercom families the SKK-620C powers.

The SKK-620C is a straightforward specification: if your Aiphone system is on the compatible list and it needs a 6V DC supply, this is the correct part to order.