After quite some time lobbying Adler Electric USA to bring their 36x22mm EF3 fuses to North America, they are now planning to stock them in their Seattle warehouse. If you’re not familiar with these fuses, then search the forum for EF3 fuses or see one discussion here: Fuses and Wattloss on T Class …

I understand that’s the point of the thread. My comment wasn’t aimed at the overall discussion about EF3 interrupt capacity or the importance of a high interrupt rating. I was responding specifically to Rick’s breaking-time comparison, which seemed to place a lot of emphasis on the differences betwe…

Gotcha. Thanks for clarifying that for me. It’s been a long week haha

Agreed! I’d rather not rely on the BMS to detect overcurrent and shutdown.

As a replacement for 70V MEGA fuses I am currently using here, I’m considering the 100A EF3 for branch circuits connected to the Victron SmartSolar 250/100, 250/85, and 250/70. And possibly the 200A ones for connecting Quattro or Multiplus 5k/48s to the DC bus bars. I’ll have to decide if the incr…

@ricardocello Pls use the Adler EF3 only for bigger batteries that have a second faster fuse build in. Branches like MPPT, RS, MP2 or Quattro do not require AiC greater than 2,000A. Consequently a faster MEGA fuse is the better choice there. My batteries have 250A MCCBs build in and an additional…

[image] Rick: Also, great conversation from everyone here, thanks! Ditto! I very much appreciate the conversation. It reinforces why we have technical reviews in the first place.

[image] Björn Kellermann: Branches like MPPT, RS, MP2 or Quattro do not require AiC greater than 2,000A. Consequently a faster MEGA fuse is the better choice there. Are you sure? With a short circuit somewhere in that branch, the fuse would have to break the current coming from the entire DC …

[image] Björn Kellermann: Branches like MPPT, RS, MP2 or Quattro do not require AiC greater than 2,000A. Consequently a faster MEGA fuse is the better choice there. I disagree! Like @Ektus above also mentions: The more batteries are present in the system, the higher the AIC needs to be. And …

A quick Google search I found semiconductor fuses special for ess/ bess systems. (GRL FUSES)

Attention distributors/dealers/installers: Adler EF3 fuses Available in the USA

Q&A and troubleshooting

OGPS (Ed @ Off-Grid Power Systems - offgridps.com) 23 July 2026 14:17 23

I measured the resistance for 200A EF3 samples that I have. See here: Fuses and Wattloss on T Class MEGA EF3 and DC Breakers

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Attention distributors/dealers/installers: Adler EF3 fuses Available in the USA

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