Class T fuses provide fast response and very high interrupt ratings, up to 20,000 Amps. Lithium batteries and large AGM banks are capable of very high short circuit currents which may be beyond the ratings of some circut breakers and fuses. Pro Installer fuse holders are ruggedly built and are compatible with the Pro Installer modular system. Note that a different holder is needed for fuses 400A and below, and for 450A and above.