Fuse could resume by the conductive polymer materials and mixed materials caused overcurrent protection devices, at normal temperature, its resistance is very small, but in action after a high-impedance state, when troubleshooting and then automatically return to low resistance state.

Based on the maximum voltage can bear, could resume fuse can be divided into several campaigns, each campaign, according to the different currents, is divided into a number of models. Secretary to the production of products as an example: WH series based on voltage division is divided into WH6 series, WH16 series, WH30 series, WH60 series, WH130 series, WH250 series and WH600 series, each below the basis of the current series is divided into a number of models .

WH6 return to fuse the scope of application of products applicable to the lower voltage, current work of a relatively small circuit, such as computers, computer peripherals, the toy industry and other fields.