UNIQUE DIMENSIONS FOR TODAY'S SMALLER EQUIPMENT AND COMPONENTS Fast-acting general purpose SBS fuses were developed in response to the industry's demand for smaller equipment and components. They are the only fuses in their size with a full 600 volt AC rating for all ampere ratings by Underwriters Laboratories Standard 248-14 and CSA No. 59.2, and are the only fuses of this size with an interrupting rating of 100kA RMS, compared to 10kA on other brands.