Why a kettle clicks off at the boil

Steam travels through a tiny channel to a bimetal strip, and heat makes it snap 🫧

That snap trips the switch and cuts power. If steam can not reach it, the kettle may not shut off.

Bonus safety: boil-dry protection helps stop scorching when the kettle is empty 🔒✅ Check your kettle type at home and see what shut-off it uses.