Littelfuse 0251010.NRT1 Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251010.NRT1 is a 10A 125VAC/VDC board mount axial fuse from the PICO® II 251 series. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The fuse is designed for through-hole mounting applications requiring fast-blow response characteristics with a 50A AC and 300A DC breaking capacity at rated voltage.

Key Parameters

Parameter	Value
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
Breaking Capacity (AC)	50 A
Breaking Capacity (DC)	300 A
Melting I²t	25.5
Size / Dimension	0.110" Dia x 0.280" L (2.80mm x 7.11mm)
DC Cold Resistance	0.0072 Ohms
Operating Temperature Range	-55°C ~ 125°C
Approval Agencies	CSA, cURus, TUV

Substitute Part Grouping Explanation

Substitution for the obsolete 0251010.NRT1 is determined by strict equivalence across the following critical parameters:

Current Rating: 10 A (exact match required)
Voltage Rating: 125 V AC / 125 V DC (exact match required)
Response Time: Fast Blow (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Axial (exact match required)
Breaking Capacity: 50 A AC / 300 A DC (exact match required)
Melting I²t: 25.5 (exact match required)
Size / Dimension: 0.110" Dia x 0.280" L (exact match required)
DC Cold Resistance: 0.0072 Ohms (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
Approval Agencies: CSA, cURus, TUV (exact match required)

All Littelfuse PICO® II 251 series substitutes listed below meet these electrical and mechanical parameters. Packaging format (Cut Tape, Tape & Reel, Tape & Box) does not affect electrical or mechanical compatibility. One cross-manufacturer substitute from SCHURTER Inc. is provided with noted parameter variations.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage AC (V)	Voltage DC (V)	Response	Package	Breaking Cap. AC (A)	Breaking Cap. DC (A)	I²t	Size (in)	Resistance (Ω)	Temp Range (°C)	Status	RoHS
0251010.NRT1	Littelfuse	10	125	125	Fast Blow	Axial	50	300	25.5	0.110 x 0.280	0.0072	-55 ~ 125	Obsolete	Non-compliant
0251010.HAT1L	Littelfuse	10	125	125	Fast Blow	Axial	50	300	25.5	0.110 x 0.280	0.0072	-55 ~ 125	Active	ROHS3
0251010.MAT1JL	Littelfuse	10	125	125	Fast Blow	Axial	50	300	25.5	0.110 x 0.280	0.0072	-55 ~ 125	Active	ROHS3
0251010.MAT1L	Littelfuse	10	125	125	Fast Blow	Axial	50	300	25.5	0.110 x 0.280	0.0072	-55 ~ 125	Active	ROHS3
0251010.MRT1JL	Littelfuse	10	125	125	Fast Blow	Axial	50	300	25.5	0.110 x 0.280	0.0072	-55 ~ 125	Active	ROHS3
0251010.MRT1L	Littelfuse	10	125	125	Fast Blow	Axial	50	300	25.5	0.110 x 0.280	0.0072	-55 ~ 125	Active	ROHS3
0251010.NAT1L	Littelfuse	10	125	125	Fast Blow	Axial	50	300	25.5	0.110 x 0.280	0.0072	-55 ~ 125	Active	ROHS3
0251010.NRT1JL	Littelfuse	10	125	125	Fast Blow	Axial	50	300	25.5	0.110 x 0.280	0.0072	-55 ~ 125	Active	ROHS3
0251010.NRT1L	Littelfuse	10	125	125	Fast Blow	Axial	50	300	25.5	0.110 x 0.280	0.0072	-55 ~ 125	Active	ROHS3
7010.7150.13	SCHURTER	10	125	125	Fast Blow	Cartridge, Non-Standard (Axial)	300	300	39	0.093 x 0.315	Not specified	-55 ~ 85	Active	ROHS3

Engineering Selection Recommendations

All Littelfuse PICO® II 251 series substitutes (0251010.HAT1L, 0251010.MAT1JL, 0251010.MAT1L, 0251010.MRT1JL, 0251010.MRT1L, 0251010.NAT1L, 0251010.NRT1JL, 0251010.NRT1L) provide direct electrical and mechanical equivalence to the obsolete 0251010.NRT1. These parts are all active products with ROHS3 compliance and maintain identical electrical specifications including current rating, voltage ratings, response time, breaking capacity, and thermal characteristics.

The primary difference among Littelfuse substitutes is packaging format. Cut Tape (CT) packaging is suitable for automated assembly processes. Tape & Reel (TR) packaging accommodates high-volume production environments. Tape & Box (TB) packaging supports lower-volume or manual assembly applications. All packaging formats deliver the same electrical component.

The SCHURTER 7010.7150.13 is a cross-manufacturer alternative that meets the core electrical requirements (10A, 125VAC/VDC, Fast Blow response). However, this part exhibits parameter variations: breaking capacity is 300A AC (versus 50A AC for Littelfuse), melting I²t is 39 (versus 25.5), physical dimensions differ (0.093" Dia x 0.315" L versus 0.110" x 0.280"), and maximum operating temperature is -55°C ~ 85°C (versus -55°C ~ 125°C). The SCHURTER part carries CSA and UR approvals (versus CSA, cURus, and TUV for Littelfuse). Use of the SCHURTER substitute requires design validation to confirm mechanical fit and thermal performance compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use any of the Littelfuse PICO® II 251 substitutes interchangeably with the 0251010.NRT1?

A: Yes. All listed Littelfuse substitutes are parametrically equivalent to the obsolete 0251010.NRT1 across all electrical and mechanical specifications. Selection among these parts is determined by packaging requirements and supply availability.

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

A: These are packaging and delivery formats that do not affect the electrical or mechanical properties of the fuse component. Cut Tape (CT) is supplied in individual strips suitable for pick-and-place assembly. Tape & Reel (TR) is supplied on continuous reels for high-speed automated assembly. Tape & Box (TB) is supplied in tape format within a box for lower-volume applications. Choose based on your assembly process requirements.

Q: Can I substitute the SCHURTER 7010.7150.13 for the Littelfuse 0251010.NRT1?

A: The SCHURTER part meets the core electrical requirements but exhibits parameter variations in breaking capacity, melting I²t, physical dimensions, and maximum operating temperature. Cross-manufacturer substitution requires design validation to confirm mechanical fit within your PCB layout and thermal performance under your specific operating conditions.

Q: Why is the original 0251010.NRT1 marked as obsolete?

A: The 0251010.NRT1 has been discontinued by Littelfuse. Active equivalent parts from the same PICO® II 251 series are available as direct replacements with identical electrical and mechanical specifications.

Q: Are all substitute parts RoHS compliant?

A: All active Littelfuse substitutes listed are ROHS3 compliant. The original 0251010.NRT1 is marked as RoHS non-compliant. The SCHURTER 7010.7150.13 is ROHS3 compliant.

Q: What certifications do these fuses carry?

A: All Littelfuse PICO® II 251 substitutes carry CSA, cURus, and TUV approvals. The SCHURTER 7010.7150.13 carries CSA and UR approvals. Verify that the certifications meet your application requirements.

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