が切れる

to run out

→ が
phrase Uncommon #9,701
to run out Used when a supply, power source, or energy is exhausted. The subject is the thing that runs out.
JA: スマホは電池が切れると使えない。
EN: A smartphone can’t be used when its battery runs out.

麻酔が切れるまで抑制できないんです

I can't control it until the anesthesia wears off.

— ビッグ・シック ぼくたちの大いなる目ざめ (2017)

ずっと活発なままかいつかスイッチが切れるのか

Will it stay active forever, or will the switch eventually turn off?

— JUNO/ジュノ (2007)