Raychem E307-120 PolySwitch PPTC Resettable Fuse

Raychem E307-120 PolySwitch PPTC Resettable Fuse is a polymer resettable fuse (PPTC) from Raychem (now TE Connectivity) that provides overcurrent protection by switching from a low-resistance state to a high-resistance state when current exceeds its threshold. When the fault condition is removed, the device cools and returns to its original low-resistance state, enabling automatic reset without replacement. PPTC devices like the E307-120 are used across consumer electronics, power supplies, battery packs, and telecom equipment to safeguard wiring from short circuits and overloads. Exact electrical ratings for the E307-120—such as hold current, trip current, voltage rating, and resistance—are defined in the model's datasheet; consult TE Connectivity's documentation for precise parameters.