Incoming 3-way spike protectionComprehensive protection that detects and suppresses spikes between positive and negative, positive and ground, and negative and ground. Low clamping voltage Compresses a 6,000V spike to a manageable 400V. For the techs this is known as a UL1449 rating of 400V. High power filtering Most units like this will work to 10 or 12 AMPS but this unit works to 15 AMPS (that"s 1,800 WATTS of regulation capacity.) Overload protection In the event of a circuit overload, your equipment will be protected by a "soft" shutdown vs. the "hard" shutdown of a relay collapsing. Noise filtering Up to 35 dB reduction in line noise in the RF spectrum (100KHZ to 100MHZ spectrum). UL Recognized