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FADUINO users frequently ask this type of question. FADUINO is an industrial controller based on Arduino, and since Arduino is widely used by beginners, this seems to be a common issue. Many users who connect external relays, contactors, or pumps/motors to FADUINO report that: "FADUINO suddenly resets when the pump starts running." They often assume this is due to a product defect. The Importance of the RC Snubber When I ask them, "Did you install an RC Snubber?", they often respond with "What …