Meicheng System Power Supply Controller KPS-12SD offers all basic power conditioning features. It provides varistor spike and surge protection across all three modes (line to neutral, line to ground, and neutral to ground), specialized 40amp multi-stage EMI filter is used to purify system power. The filter works to prevent noise from fluorescent lights, certain dimmers, radio transmitters, and similar sources of " electronic pollution" from leaking from the AC line to audio, video, or computer circuits. Ensuring the system operation stability and optimal performance.