Released recently by Bel Fuse is the square ceramic surface-mountable SMM series of 3812 size
medium-blow fuses. SMD fuses with rated current values up to 30 A and with voltage ratings up to 250 V a.c. and 65 V d.c., they satisfy requirements for devices supporting high power consumption with limited board space. The parts are RoHs compliant, lead-free and halogen free, and are resistant to chemical solvents and aqueous cleaning.
The fuses are well suited for over-current protection in a broad spectrum of high-current applications. 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.
Offered with 20 A, 25 A and 30 A ratings, the SMM series features an operating temperature range of -55°C to +85°C with proper derating. At 100% of ampere rating, opening time is 4 hours minimum; 60 seconds maximum at 200% of ampere rating. The fuses are manufactured of ceramic bodies with matte tin-plated brass caps.
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