The advancement of solid-state controls has produced another type of current-sensitive relay, a PTC starting switch.

Question

Quizplus · Accepted Answer

PTC (Positive Temperature Coefficient) starting switches are a type of current-sensitive relay that utilize solid-state controls. They are designed to increase their resistance significantly with an increase in temperature, which is useful in motor starting circuits for providing overcurrent protection.

The Advancement of Solid-State Controls Has Produced Another Type of Current-Sensitive