A compact, very-high-interrupting fuse (~20,000 A) used as the main lithium battery fuse. MRBF and MEGA fuses are fine for smaller/branch duties but cannot break as much fault current.
A lithium bank can short-circuit into tens of thousands of amps. A Class T fuse has the very high interrupting rating to clear that cleanly — where an ordinary fuse could arc or burst.
It is the main fuse at the battery positive on lithium systems. MRBF and MEGA fuses serve smaller or branch duties but cannot break as much fault current.
Design your van, boat, cabin or RV system in Wattonomy and it specifies a Class T as the main lithium battery fuse by default, sized with the right interrupting rating for your bank — from the appliances you actually run, sized to the recognized standard for your region. You see it on the wiring diagram, in the sized parts list, and in a plain-English build pack that explains the reasoning behind every choice. No account, no email — about a minute to a complete, validated design.
Because of its very high interrupting rating (around 20,000A). A lithium short can exceed what ordinary fuses can break; a Class T clears it safely.
Class T has the highest interrupting rating and is the main lithium battery fuse. MRBF and MEGA are fine for smaller single batteries or branches but break far less fault current.
It takes about a minute. No account, no email.