Bel Fuse's square ceramic
surface-mountable SMM Series of
3812 size medium-blow fuses have rated current values up to 30A and with
voltage ratings up to 250V ac and 65V dc. They are RoHs-compliant, Pb-free and
Series have 20, 25 and 30A ratings and an operating temperature range of -55 to
+85C with proper derating. At 100 percent of ampere rating, opening time is 4
hours minimum; 60 secs maximum at 200 percent of ampere rating. Fuses are
manufactured of ceramic bodies with matte tin plated brass caps. Parts are
provided on 13 inch reels, 2,000 per reel.†
SMM fuses are useful for overcurrent protection in a broad spectrum of
high-current applications in which a small form factor device is specified to
optimize board space. Included among their most common usage is in the
protection of high-current circuits (primary or secondary) of larger power
supplies, as well as in the protection of (telecom) backplane structures from
overloads or short circuits, which could disrupt an entire system. The SMM fuse
can isolate a specific section or circuit, allowing the remaining circuits to
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