Littelfuse 0251010.NF030JL Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251010.NF030JL is a 10 A 125 V AC/DC board mount fuse in the PICO® II 251 series, designed for through-hole axial mounting applications. This fast-blow fuse is actively produced and widely used in industrial and commercial electronics requiring overcurrent protection. Substitute parts are identified to provide design flexibility, inventory optimization, and supply chain alternatives while maintaining identical electrical and mechanical performance specifications.

Key Parameters

Parameter	Specification
Current Rating	10 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Fast Blow
Mounting Type	Through Hole
Package / Case	Axial
Size / Dimension	0.110" Dia x 0.280" L (2.80mm x 7.11mm)
Breaking Capacity @ Rated Voltage	50A AC, 300A DC
Melting I²t	25.5
DC Cold Resistance	0.0072 Ohms
Operating Temperature Range	-55°C ~ 125°C
Approval Agencies	CSA, cURus, TUV
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 0251010.NF030JL are qualified based on strict electrical and mechanical parameter equivalence within the PICO® II 251 series. All substitute parts maintain identical current rating (10 A), voltage ratings (125 V AC/DC), response time (Fast Blow), package geometry (Axial, 0.110" Dia x 0.280" L), breaking capacity (50A AC, 300A DC), melting I²t (25.5), DC cold resistance (0.0072 Ohms), operating temperature range (-55°C ~ 125°C), and regulatory approvals (CSA, cURus, TUV). Substitutes differ only in packaging format (Tape & Box versus Cut Tape) and REACH compliance status, which do not affect electrical or mechanical performance in the application circuit.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage AC/DC	Response Time	Package / Case	Size (Dia x L)	Breaking Capacity	Melting I²t	DC Cold Resistance	Operating Temp	Approvals	RoHS Status	Packaging Format
0251010.NF030JL	Littelfuse Inc.	PICO® II 251	10 A	125 V / 125 V	Fast Blow	Axial	0.110" x 0.280"	50A AC, 300A DC	25.5	0.0072 Ω	-55°C ~ 125°C	CSA, cURus, TUV	ROHS3	Tape & Box
0251010.HAT1L	Littelfuse Inc.	PICO® II 251	10 A	125 V / 125 V	Fast Blow	Axial	0.110" x 0.280"	50A AC, 300A DC	25.5	0.0072 Ω	-55°C ~ 125°C	CSA, cURus, TUV	ROHS3	Cut Tape
0251010.MAT1JL	Littelfuse Inc.	PICO® II 251	10 A	125 V / 125 V	Fast Blow	Axial	0.110" x 0.280"	50A AC, 300A DC	25.5	0.0072 Ω	-55°C ~ 125°C	CSA, cURus, TUV	ROHS3	Cut Tape
0251010.MAT1L	Littelfuse Inc.	PICO® II 251	10 A	125 V / 125 V	Fast Blow	Axial	0.110" x 0.280"	50A AC, 300A DC	25.5	0.0072 Ω	-55°C ~ 125°C	CSA, cURus, TUV	ROHS3	Cut Tape

Engineering Selection Recommendations

All four part numbers are active products from Littelfuse Inc. and carry identical electrical and mechanical specifications. Selection between 0251010.NF030JL and its substitutes (0251010.HAT1L, 0251010.MAT1JL, 0251010.MAT1L) should be based on packaging requirements and supply chain availability. The main part (0251010.NF030JL) is supplied in Tape & Box format, while all substitutes are supplied in Cut Tape format. For high-volume production requiring reel packaging, Cut Tape variants offer operational efficiency. All parts maintain CSA, cURus, and TUV certifications and comply with ROHS3 standards. The 0251010.MAT1L variant is REACH Unaffected, while 0251010.NF030JL and 0251010.HAT1L are also REACH Unaffected; 0251010.MAT1JL is REACH Affected. For applications subject to REACH compliance requirements, select 0251010.NF030JL, 0251010.HAT1L, or 0251010.MAT1L.

Frequently Asked Questions (FAQ)

Q: Can 0251010.HAT1L, 0251010.MAT1JL, and 0251010.MAT1L be used interchangeably with 0251010.NF030JL in the same circuit?

A: Yes. All four parts are electrically and mechanically identical. They share the same current rating (10 A), voltage ratings (125 V AC/DC), response time (Fast Blow), physical dimensions (0.110" Dia x 0.280" L), breaking capacity (50A AC, 300A DC), and thermal characteristics. Substitution is valid for any application using the 0251010.NF030JL.

Q: What is the difference between Tape & Box and Cut Tape packaging?

A: Tape & Box packaging (0251010.NF030JL) provides components on a reel with a protective box, suitable for manual handling and smaller order quantities. Cut Tape packaging (0251010.HAT1L, 0251010.MAT1JL, 0251010.MAT1L) provides components on a continuous reel without individual boxing, optimized for automated pick-and-place assembly and high-volume production. Both formats contain identical components.

Q: Are there any compliance or certification differences between these parts?

A: All parts carry CSA, cURus, and TUV approvals and are ROHS3 compliant. REACH status differs: 0251010.NF030JL, 0251010.HAT1L, and 0251010.MAT1L are REACH Unaffected, while 0251010.MAT1JL is REACH Affected. For applications requiring REACH compliance, use 0251010.NF030JL, 0251010.HAT1L, or 0251010.MAT1L.

Q: Can I substitute a different current rating or voltage rating fuse?

A: No. Fuse substitution is valid only when all electrical parameters—current rating, voltage rating (AC and DC), response time, and breaking capacity—are identical. Using a fuse with different ratings will not provide proper circuit protection and may create safety hazards.

Q: What does "Fast Blow" response time mean?

A: Fast Blow indicates the fuse responds quickly to overcurrent conditions, typically within milliseconds. This characteristic is determined by the fuse element design and melting I²t value (25.5 for this series). All substitute parts maintain this identical response characteristic.

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