Combined fuse and application device thereof, and protection method of application device

The invention provides a combined type fuse and an application device thereof, and a protection method of the application device. The combined type fuse comprises two fusing modules, which are connected in parallel, wherein each fusing module comprises at least one full-range protection fuse. According to the invention, the combined fuse provided by the invention comprises the two fusing modules which are connected in parallel, so that shunting can be realized; and after the combined fuse is applied to the American box transformer substation, the problem that the capacity of the existing American box transformer substation is limited by the rated current specification of the fuse can be solved, so that the existing fuse meets the model selection requirement that the capacity exceeds 3150KVA American box transformer substation. 本申请提供了一种组合式熔断器及其应用装置与应用装置的保护方法，该组合式熔断器包括：两个熔断模块；两个熔断模块并联；每个熔断模块中，均包括至少一个全范围保护熔断器；由于本申请提供的组合式熔断器包括两个并联的熔断模块，能够实现分流，进而将其应用于美式箱变后，能够解决现有美式箱变的容量受限于熔断器额定电流规格的问题，使得现有熔断器满足容量超过3150KVA美式箱变的选型要求