Current Interrupting Rating is another critical rating. A fuse may be rated to blow at 50 amps, but it may actually see several thousand amps at the instant it blows.

 Induction is the reason. Electrical circuits with coils of wire, such as motors, ballasts or transformers store huge amounts of electricity. This is called "induction". Circuits with purely resistive loads, such as electric heaters, do not. When a fuse protecting high inductive loads blows, it may experience thousands of amps. Many fuses commonly used to protect a single motor are only rated for 10,000-amps. In some applications especially with just one motor, this is adequate. It is important, however to consult a qualified electrician, or engineer to verify that the fuse has a proper interruptin or AIC rating. A fuse or circuit breaker, which does not have proper AIC rating may violently explode. In the process it can destroy the fused disconnect, even the wall, shower the area with molten metal and injure or kill personnel.

 In some applications a fuse holder may be designed to only accept fuses that have a higher AIC rating. Such fuse holders are called "rejection type fuse holders" and only accept fuses that are considered "current limiting" meaning that they have the highest AIC rating available. Rejection type fuses can be used in any holder designed for the correct fuse class, voltage and amperage of the fuse. However, only rejection type fuses can be used in rejection type holders.