Think of cutout as what is left after you cut something out: a line goes right round, and something comes away from the whole. Sometimes what comes away is a shape you can hold. Sometimes what is taken away is the flow of electricity, and the part that does the taking is itself called the cutout.
Two branches
剪下來的那一片形狀
這一邊把注意力放在「被切下來的東西」。切完之後，那片形狀變成一個獨立、可以拿在手上的東西。
noun · B1
A shape of a person, animal, or object that has been cut out of card, paper, wood, or thin metal. A big one of a person is often stood up so that, from a distance, it looks like the real thing.
剪下的形狀；紙板立牌
把電切斷的零件
這一邊被切掉的不是紙，是電流。名字落在「做這個切斷動作的零件」上，所以它是機器裡的一個東西，不是一片形狀。
noun · C1
A part built into a machine or an electrical circuit that cuts off the power by itself when something goes wrong, so the machine stops before it is damaged.
自動斷電裝置