The KLM-12 is a fast-acting supplemental fuse designed for 600Vac/dc applications, available in a 12-ampere rating as part of the Bussmann Series KLM fuse family. It features a compact 13/32" × 1-1/2" form factor with melamine tube construction and nickel-plated endcaps, delivering an interrupting rating of 100 kA at 600 Vac and 50 kA at 600 Vdc. The fuse exhibits fast-acting characteristics with an opening time of 4 hours minimum at 110% of rated amperage and opens within 1 hour at 135% of rated amperage. It is color-coded black for 600Vac/dc identification and is UL Listed (Std. 248-14) and CSA Certified (C22.2 No. 248.14), making it suitable for DC control circuits and photovoltaic systems up to 600Vdc where reliable overcurrent protection is essential.