question

mike-g avatar image
mike-g asked

Lynx Smart BMS ATC and ATD Port Fusing

The representative schematics that incorporate the Lynx Smart BMS all show external fusing of the AUX, ATD and ATC contacts. However, the manual indicates in section 3.9 that the AUX port is fused. "This supply outputs the same voltage as the system battery voltage and is rated at a maximum continuous current rating of 1.1A and is protected by a re-settable fuse."

In section 3.6, the manual states, "The maximum current rating of the allow-to-charge and allow-to-discharge contact is 0.5A and the ports are protected by a self-resetting fuse."

I have two questions about this. Is external fusing required, as indicated in the system schematics, or is the re-settable fuse sufficient? Where are these resettable fuses located?

Thanks.


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1 Answer
Stefanie (Victron Energy Staff) avatar image
Stefanie (Victron Energy Staff) answered ·

Hi @Mike_G

A current conducting wire always need to be protected despite of an internal fuse, which is protecting the internal electronics or relay from overload. It's not only good habit but also required to protect all live wires.

The internal fuse is not accessible for the user. AFAIK it's one of those self-resettable SMD fuses on the PCB.

FYI: I have adjusted the title a bit to include the correct product name.


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