1.25 A fast-blow protection in a 0603 footprint
The Littelfuse 04671.25NRHF is a 1.25 A fast-blow surface-mount fuse from the 467 series, packaged in a 0603 (1608 metric) case. It is rated for 32 V AC and 65 V DC, with a breaking capacity of 35 A AC and 13 A DC at the rated voltage. The 1.25 A current rating sets the threshold where the fuse element begins to melt under sustained overload. The fast-blow response means it clears quickly on short-circuit events, limiting peak let-through energy to 0.0518 A²s (melting I²t).
Breaking capacity and coordination
With a breaking capacity of 35 A AC and 13 A DC, this fuse can safely interrupt fault currents up to those levels without rupturing. The 0.0518 A²s melting I²t is the energy required to open the fuse — this value is used to coordinate with downstream semiconductor or PCB trace fusing. The DC cold resistance of 0.051 Ohms at 25°C produces a voltage drop of about 64 mV at rated current — negligible in most low-voltage circuits but worth checking if the load is sensitive to supply droop.
Approvals and operating range
The 04671.25NRHF carries CSA and UL approvals, certifying compliance with North American safety standards for overcurrent protection. The operating temperature range spans -55°C to 90°C, covering most industrial control, telecom, and automotive under-hood environments.