A sump pump kicks on automatically due to the buoyant movement of its attached float switch. As rainwater or groundwater accumulates inside the sump pit basin during a storm, the rising water level lifts the float (whether it is a tethered ball, vertical rod, or electronic pressure sensor) to a predetermined threshold. Once the float reaches this activation height, it mechanically or electronically closes the electrical switch contacts, supplying power to the motor. Verification: Watch the float rise when adding water to confirm the motor engages automatically.
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