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Physical Fuse Selection
In regulation 8.5.Ab, it states, “A DC-rated fuse (not a circuit breaker) must be placed first in series with the battery starting at the positive connection within each battery enclosure“All other wiring branching off the main bus circuit must have properly sized fuses. Fuses must be located near the branch point, either within the same enclosure or before a reduction in rated conductor ampacity.” This means we can't rely solely on the eFuse, and we need to place a physical fuse in series to act as backup protection.
The physical fuse will be selected to a current specification above the maximum of the eFuse so that the eFuse, which requires minimal manual intervention to reset, should trip first and save the physical fuse.
As the fuse will only be required to act when there is a failure to do so by the eFuse, a very rare occurrence, we will be prioritizing size in our selection of physical fuse.
eFuse Parts Selection
eFuse IC: TPS25983 (
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