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Littelfuse Inc. 0451015.MR — Circuit Protection

0451015.MR Littelfuse NANO² 451 15A Fast Blow SMD Fuse

MPN0451015.MR
Obsolete

Littelfuse NANO²® 451 Series, Board Mount SMD Fuse, Fast Blow, 15 A, 65 V AC/DC, 50 A Breaking Capacity, 2-SMD Square End Block Package, Tape & Reel.

$2.3800Ref. price · indicative, final on quote
Littelfuse Inc. 0451015.MR datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

0451015.MR specifications
ParameterValue
SeriesNANO²® 451
Fuse typeBoard Mount (Cartridge Style Excluded)
MountingSurface Mount
Voltage rating - AC65 V
Voltage rating - DC65 V
Breaking capacity @ rated voltage50A
Current rating15 A
Response timeFast Blow
Operating temperature-55°C ~ 125°C
Size (Dimension)0.240\" L x 0.106\" W x 0.106\" H (6.10mm x 2.69mm x 2.69mm)
Approval agencyCSA, UL
PackageTape & Reel (TR)
Melting i2t97.82
Case2-SMD, Square End Block
DC cold resistance0.0037 Ohms

Product details

Obsolete NANO² 451 SMD Fuse — Sourcing Reality

The 0451015.MR is a Littelfuse NANO²® 451 series surface-mount fast-blow fuse rated 15 A at 65 V AC/DC with a breaking capacity of 50 A at rated voltage. It is now classified as Obsolete by the manufacturer.

Parametric Profile and Board Fit

The fuse measures 6.10 mm x 2.69 mm x 2.69 mm in a 2-SMD square end block package, surface-mount only. The DC cold resistance is 0.0037 Ohms, and the melting I²t is 97.82 — useful for coordination with downstream components. Approvals include CSA and UL, covering North American regulatory acceptance.

Frequently asked questions

What is the closest pin-compatible alternative to 0451015.MR?

No official pin-compatible successor or cross-reference is recorded from Littelfuse for the 0451015.MR. A functional replacement would require reviewing the same NANO² 451 series ratings or a different package — a board spin may be needed.