Yes, residential sump pumps operate automatically without requiring manual intervention. They utilize an attached float switch (either a tethered float, vertical float, or electronic pressure sensor) that floats on the surface of the water inside the sump pit basin. As rainwater or groundwater fills the pit during a storm, the rising water lifts the float to a specific threshold, which mechanically or electronically triggers the electrical switch to turn the pump motor on. Verification: Watch the float rise when adding water to confirm the motor engages automatically.
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