Will the smart switch store energy if it does not reclose

What happens when a smart switch is turned off?

When a smart switch is turned off, the circuit is broken and no power flows to the connected device. However, this causes a problem for smart switches, as they require a small amount of power to function.

Do smart switches need a neutral connection?

Smart switches that don't require a neutral connection power themselves by leaking power through the lamp (or other device) being switched.

How much power does a smart switch need?

However, in their documentation they suggest that an LED load of around 5W is the minimum which can provide sufficient leakage current to power the electronics of the smart switch in the 'off' state.

Can a broken protective earth cause a light switch to fail?

The broken protective earth in a fixture is an invisible failure (and may not cause the device to fail). Then a subsequent isolation failure could be fatal. My legacy light switch had a slightly 'hot' back box just weeks after a full inspection.