line status indicator

As shown in the attached picture, when the line is normal, H1 and H2 glow, but H3 and H4 do not light up. When the fuse on the live line blows, H3 lights up and H2 goes out. When the fuse on the neutral line blows, H4 lights up and H2 goes out. When both fuses are blown, H2, H3, and H4 will not light up, but H1 will still light up. When H1 and H2 are glowing, the electrical appliance cannot work normally, which means that the electrical appliance or the circuit after H2 is faulty. After the fuse blows at night, H1 can also provide indoor low-light lighting, allowing users to safely replace the fuse. When making, neon lamps can be made from neon bulbs in fluorescent lamp starters, which consume very little when working. If colored paper is pasted on the outside of the neon bubble, it will be easier to observe.