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I own a Brymen BM235 multimeter, among other test instruments. While it's a nice multimeter, I have one problem with it: the fuse for the mA jack is a Siba 7017240.0,4, and nobody even bothers with putting this part in their catalog, never mind stocking it. (Octopart shows no results at all. That's how bad this situation is.)

However, the adjacent values (315mA and 500mA) in the Siba 7017240 line are stocked. Given that my BM235 (interestingly enough) says 600mA on the front for the maximum current it can measure using the mA jack, which fuse (315mA or 500mA) should I substitute for the unobtanium 400mA fuse, or should I try to poke Brymen or the distributor I got the meter through about this little conundrum? Or should I try to find a way to get Siba to point me at where I can get these in the USA? (It's the one fuse I don't have spares on-hand for at the moment -- even though I generally don't blow meter fuses to begin with, and haven't blown the one in the Brymen, I'd rather be prepared in this case.)

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  • \$\begingroup\$ I don't think there's anything special about that particular fuse. Any HRC fuse with the same dimensions and capacity should work. \$\endgroup\$
    – Ignacio Vazquez-Abrams
    Commented Dec 17, 2017 at 2:22
  • \$\begingroup\$ @IgnacioVazquez-Abrams -- I don't know of any true substitutes for the Siba 7017240 line -- the Littelfuse 508 comes close, but a) isn't available in 400mA (only 315mA and 500mA) and b) is only rated to 10kAIC@1kVAC/DC (while the Siba parts in question are rated to 30kAIC@1kVAC/DC minimum) \$\endgroup\$
    – ThreePhaseEel
    Commented Dec 17, 2017 at 12:28

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A thread on the EEVBlog mentions that the SIBA 70 172 40 FF400mA Fuse Ultra Rapid FF 400mA 1000V DMM DMI fuse is available on eBay. And, in fact, a cursory search for 400mA FF reveals that there are several offerings.

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    \$\begingroup\$ I was actually able to find a European distributor who carried it in the end (eBay is not a distributor in my book, although if it's a cal service type place selling them, your chances of getting the real deal are probably better than some random seller of junk) \$\endgroup\$
    – ThreePhaseEel
    Commented Oct 17, 2018 at 3:54

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