What are the disadvantages of poly fuse?

Poly fuses, or polymeric positive temperature coefficient (PPTC) devices, can have several disadvantages. They may not respond as quickly as traditional fuses, leading to potential damage in the circuit before they react. Additionally, their resistance can increase over time due to thermal cycling, which may affect performance. Lastly, they can have a limited number of reset cycles, potentially leading to reduced reliability in applications requiring frequent resets.