This is the highest flammability rating awarded by Underwriters Laboratories (UL 94 standard). It indicates that the PCB material will self-extinguish within 10 seconds and will not drop burning particles when exposed to a vertical flame.
The SH1 94V-0 fuse is widely used in various industries, including: sh1 94v-0 datasheet
If you are repairing electronics, sourcing parts, or designing a printed circuit board (PCB), you have likely seen the text stamped directly onto a green, black, or blue circuit board. This is the highest flammability rating awarded by