ActronAir 3-Phase Soft Starter Kit reduces compressor start current to less than 45 amps on 3-phase residential and commercial ducted systems, protecting the compressor from lock-rotor stress and reducing peak demand draw at startup. Without a functioning soft starter, compressor start currents can exceed safe thresholds, causing contactor wear and potential compressor damage. Low voltage inputs only — connecting 240VAC will damage equipment and void your ActronAir warranty.