Aiphone PS-12C is a DC power supply for intercoms, compatible with TD-H, TD-Z, LEF, and MP-S systems. This unit contains solid-state voltage regulation and self-restoring overload protection. It has an input voltage of AC 120V and a frequency of 50/60 Hz. The power consumption is 28W, the output voltage is DC 12V, and the maximum output current is DC 1A. The PS-12C has DC plus and minus output terminals, and the terminal polarity must be observed during installation.