One of the local contractors got frustrated by return calls for blown fuses to a recent installation, so they just replaced the 3 Amp fuse with a 25 Amp fuse so they would not keep blowing the fuses. They were correct. The 25 Amp fuse was enough to start an electrical fire. Most digital bus video cameras, vehicle camera, mobile video surveillance systems, digital in-car video camera, in-car camera, bus camera surveillance systems require very low amperage fuses, it is dangerous to increase the fuse rating.