5121 400AMP Class T FuseFeatures:. Extremely fast short-circuit response. 20,000 Ampere Interrupt Capacity (AIC). UL listed to standard 248-15. DC Tested to UL standard 198L. WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.