The JBJ ATO has an auto-shutoff which is set at default to 3 minutes and you can adjust it to go longer. You open up the unit and you'll see a little dial on the circuit board.
My float switch gets stuck sometimes and it will blast for 3 minutes and shut off. The water level in my sump goes up about an inch but no animals are ever affected. You reset it by unplugging the ATO and plugging it back in.
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-Mason
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