Littelfuse 0251007.NRT1L Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251007.NRT1L is a 7 A, 125 V AC/DC board mount fuse in axial package configuration, part of the PICO® II 251 series. This through-hole fuse is designed for fast-blow response applications requiring board-level protection. The part maintains active product status with 175,060 units in current inventory. Substitute parts are identified based on identical electrical ratings, mechanical dimensions, and regulatory compliance to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	7 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Fast Blow
Mounting Type	Through Hole
Package / Case	Axial
Breaking Capacity @ Rated Voltage	50 A AC, 300 A DC
Melting I²t	10.4
Size / Dimension	0.110" Dia x 0.280" L (2.80 mm x 7.11 mm)
DC Cold Resistance	0.0107 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 0251007.NRT1L are classified as parametric equivalents based on the following criteria:

Substitution-Determining Parameters:

Current Rating: 7 A (identical across all substitutes)
Voltage Rating: 125 V AC / 125 V DC (identical across all substitutes)
Response Time: Fast Blow (identical across all substitutes)
Mounting Type: Through Hole (identical across all substitutes)
Package Configuration: Axial (identical across all substitutes)
Physical Dimensions: 0.110" Dia x 0.280" L (identical across all substitutes)
Breaking Capacity: 50 A AC, 300 A DC (identical across all substitutes)
Melting I²t: 10.4 (identical across all substitutes)
Regulatory Compliance: CSA, cURus, TUV (identical across all substitutes)
RoHS Status: ROHS3 Compliant (identical across all substitutes)

All substitute parts maintain identical electrical performance, mechanical compatibility, and regulatory certifications, enabling direct replacement in existing circuit designs.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Response Time	Breaking Capacity AC	Breaking Capacity DC	Melting I²t	DC Cold Resistance (Ω)	Inventory (Pcs)	Product Status
0251007.NRT1L	Littelfuse Inc.	PICO® II 251	7	125	125	Fast Blow	50 A	300 A	10.4	0.0107	175,060	Active
0251007.HAT1L	Littelfuse Inc.	PICO® II 251	7	125	125	Fast Blow	50 A	300 A	10.4	0.0107	1,012	Active
0251007.MAT1L	Littelfuse Inc.	PICO® II 251	7	125	125	Fast Blow	50 A	300 A	10.4	0.0107	2,612	Active
0251007.MRT1L	Littelfuse Inc.	PICO® II 251	7	125	125	Fast Blow	50 A	300 A	10.4	0.0107	2,400	Active

Engineering Selection Recommendations

All substitute parts (0251007.HAT1L, 0251007.MAT1L, 0251007.MRT1L) maintain active product status with Littelfuse Inc. Each part carries identical regulatory certifications (CSA, cURus, TUV) and ROHS3 compliance. Selection between the main part and substitutes should be based on inventory availability and lead time requirements, as all parts are electrically and mechanically equivalent. The 0251007.NRT1L offers the highest inventory level at 175,060 units, while 0251007.MAT1L provides 2,612 units and 0251007.MRT1L provides 2,400 units as secondary options.

Frequently Asked Questions (FAQ)

Q: Can 0251007.HAT1L, 0251007.MAT1L, and 0251007.MRT1L be used interchangeably with 0251007.NRT1L?

A: Yes. All parts are parametric equivalents with identical current ratings (7 A), voltage ratings (125 V AC/DC), response characteristics (Fast Blow), physical dimensions (0.110" Dia x 0.280" L), and regulatory approvals. Direct substitution is supported in circuit applications.

Q: What determines compatibility between these fuse part numbers?

A: Compatibility is determined by matching electrical parameters (current, voltage, response time), mechanical specifications (package type, dimensions), and regulatory certifications. All four parts meet these criteria identically.

Q: Are there packaging differences between these parts?

A: All parts are supplied in Cut Tape (CT) packaging and feature identical axial through-hole configuration. No packaging or form-factor differences exist.

Q: What is the difference between the part number suffixes (NRT1L, HAT1L, MAT1L, MRT1L)?

A: The suffixes indicate internal manufacturing or tape reel configuration variants. These do not affect electrical performance, mechanical compatibility, or regulatory compliance.

Q: Which part should be selected for new designs?

A: Any of the four parts may be selected based on availability and procurement lead time. All maintain identical performance and compliance characteristics suitable for new circuit protection applications.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message