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Surge Protectors by Mars. Details:The Mars spd is designed to protect your HVAC equipment for power surges spikes and transients. Power surges can damage compressors controls sensors logic boards and ecm motor electronics resulting in costly repairs. The Mars surge utilizes state-of-the-art thermally protected mov tpmov technology to outperform competitive units while providing safe and reliable protection. Mars spd is designed to protect the entire HVAC unit and controls: compressors heat pumps ecm Motors control boards and sensors.