This is the 17086th most frequent Russian word.
сработавшая
"Triggered" or "worked successfully."
Acting as an adjective, 'сработавшая' describes the alarm that has triggered.
Сработавшая сигнализация испугала злоумышленника.
The triggered alarm scared off the intruder.
Used as a participle adjective, 'сработавшая' describes the mechanics that functioned or worked properly.
Это была сработавшая механика, которая принесла успех проекту.
It was the implemented mechanics that brought success to the project.
Here, 'сработавшая' is used figuratively to describe the team that performed efficiently.