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Official Interpretation

2/28/2005 Regulation 5.8.3
Question:
For over-current protection with li-ion batteries, is a standard DC fast blow fuse sufficient? also, the regulations don't go into much detail, but the BPS testing precedure document implies that a relay will be used for the BPS. is MOSFET switching acceptable for the battery protection system?
Official Response:
Fast blow fuses are not acceptable for BPS overcurrent protection as their performance is too variable. MOSFETs are not acceptable for BPS shutoff as they can fail shorted.