Key ratings and what they drive
The 0451010.NR: Rated 10 A continuous at 125 V AC or DC — this fuse sits in a secondary-side DC rail or low-voltage AC branch where the supply is under 125 V. The fast-blow response time means it clears on short-duration overcurrents, so it suits circuits with minimal inrush (e.g., control logic, sensor power, or signal conditioning). Breaking capacity is 35 A AC and 50 A DC at the rated voltage — the fuse can interrupt a fault current up to those levels without rupturing the package. For a 10 A rail, a short-circuit current above 50 A DC would require an upstream current-limiting device to keep the fault within the fuse's interrupt rating. Melting I²t is 26.46 A²s — this value governs the fuse's ability to ride through brief current pulses. A downstream capacitor bank or motor start that draws a surge exceeding this I²t threshold will open the fuse, so the pulse energy must be budgeted against this figure during design. This is negligible for most PCB layouts but should be accounted for in a low-voltage rail where every millivolt of drop matters.
Package and board-fit
Housed in a 2-SMD square end block package measuring 6.10 mm x 2.69 mm x 2.69 mm — the compact footprint fits dense PCB layouts where a through-hole fuse would consume too much board area. Surface-mount assembly aligns with reflow soldering processes; the Tape & Reel packaging supports automated pick-and-place.
Approvals and temperature range
Approved by CSA, PSE, and UL — the fuse carries the certifications needed for equipment sold into North American and Japanese markets.