Fuses and Breakers
Fuses and circuit breakers are safety devices that protect electrical circuits by interrupting the flow of electricity in the event of an overload or short circuit, preventing damage to the circuit and reducing the risk of fire.
Fuses and Breakers must be sized properly – Please read our Guide to Fuse Sizing and Selection for more information.
MEGA fuses are commonly used in Campers and RVs for protecting high-current circuits like power inverters, DC-DC chargers, and solar charge controllers. MEGA fuses are affordable and reliable, however, they have a low interrupt rating of 2,000 Amps and therefore, should not be used as battery bank fuses.
ANL Fuses are also used for protecting high-current circuits like power inverters, DC-DC chargers, and solar charge controllers. ANL fuses are designed to be ignition protected, making them suitable for installation near combustible vapors. ANL fuses have an interrupt rating of 5,000 Amps, meeting the ABYC standards for serving as the main circuit protection for large lead acid battery banks. However, for lithium battery banks Class-T Fuses are recommended.
MRBF Fuses – Marine Rated Battery Fuse
MRBF fuses have an interrupt rating of 10,000 Amps and meet ABYC standards for lead acid battery banks.
Class T fuses have an interrupt rating of 20,000 Amps and should be used in lithium battery banks or situations where multiple lead acid battery banks are wired in parallel. Both of these types of battery installs could produce current interrupt values that would exceed what an ANL / MRBF fuse could interrupt safely.