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No. The LED lights with the circuit it switches, so with the switch off nothing is drawing. That is the whole point of it — in daylight you cannot hear a water pump or see an under-tray light, but you can see a lit bezel from across the camp.
Not directly. Use it to switch a relay instead and let the relay carry the heavy current. The 20A rating is a ceiling, not a target, and motor loads pull a hefty surge the moment they start. Lights, a fan, a pump or a fridge feed are what it suits.
More than you think. The 22mm figure is the hole in the panel — the switch body, the terminals and the bend radius of the wiring all sit behind it. Measure the depth before you cut, and drill with a step bit or hole saw so the edge stays round and clean.

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