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Child Tamper-Resistant Outlets
A few electrical device manufacturers make electrical outlets that are intended to prevent a child from inserting something into the outlet holes. They look just like any other outlet, but behind the face of the receptacle are plastic shutters.

These shutters are designed to remain closed until a plug is inserted. When something is inserted into both vertical outlet holes at the same time, the interior plastic shutters open. Its safety is premised on the fact that most young children will not try to stick two objects into the two vertical outlet holes at the same time.

может предложить более общий вариант:

outlets with safety shutters

The power boards must have overload protection, be fitted with internal safety shutters that protect unused outlets and be fitted with an on/off switch for each outlet.