Littelfuse 0451010.NRL Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0451010.NRL is a 10 A, 125 V AC/DC surface mount board mount fuse in the NANO²® 451 series. This fast-blow fuse is designed for circuit protection in applications requiring 2-SMD, square end block packaging. The part is active in production with full inventory availability. Equivalent and substitute parts are identified to support procurement flexibility, alternative sourcing, packaging format preferences, and design optimization across compatible electrical and mechanical specifications.

Substiute Parts

0451010.NRL

Littelfuse Inc.In Stock: 11620451010.NRL Datasheet

Current PartRFQ

0448010.MR

Littelfuse Inc.In Stock: 100000448010.MR Datasheet

Parametric EquivalentRFQ

0451010.MRL

Littelfuse Inc.In Stock: 1002220451010.MRL Datasheet

Parametric EquivalentRFQ

0451010.MRSN

Littelfuse Inc.In Stock: 214610451010.MRSN Datasheet

Parametric EquivalentRFQ

0453010.MR

Littelfuse Inc.In Stock: 224790453010.MR Datasheet

Parametric EquivalentRFQ

0476010.MR

Littelfuse Inc.In Stock: 32220476010.MR Datasheet

Parametric EquivalentRFQ

0476010.MRSN

Littelfuse Inc.In Stock: 29500476010.MRSN Datasheet

Parametric EquivalentRFQ

0679L9100-01

Bel Fuse Inc.In Stock: 815530679L9100-01 Datasheet

DirectRFQ

0679L9100-05

Bel Fuse Inc.In Stock: 14090679L9100-05 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts are grouped into two categories based on substitution type and electrical characteristics:

Parametric Equivalents (Littelfuse NANO²® Series): Parts 0448010.MR, 0451010.MRL, 0451010.MRSN, 0453010.MR, 0476010.MR, and 0476010.MRSN share identical current rating, voltage rating, response time, mounting type, package format, and physical dimensions with the main part. These parts differ in series designation, packaging format (Cut Tape vs. Tape & Reel), and in some cases, breaking capacity and melting I²t characteristics. Parametric equivalents maintain full electrical and mechanical compatibility for direct substitution in circuit protection applications.

Direct Manufacturer Equivalent (Bel Fuse Inc. 0679L Series): Parts 0679L9100-01 and 0679L9100-05 are from an alternative manufacturer and meet the same current rating, voltage rating, response time, mounting type, and package format. These parts feature slightly different physical dimensions (0.240" L x 0.100" W x 0.110" H vs. 0.240" L x 0.106" W x 0.106" H) and different breaking capacity specifications, but maintain functional equivalence for 10 A, 125 V AC/DC circuit protection.

Key Parameters for Substitution Compatibility:

• Current Rating: 10 A
• Voltage Rating: 125 V AC / 125 V DC
• Response Time: Fast Blow
• Mounting Type: Surface Mount
• Package / Case: 2-SMD, Square End Block
• Operating Temperature: -55°C ~ 125°C

Parameter Comparison

Engineering Selection Recommendations

Littelfuse NANO²® 451 Series (0451010.MRL, 0451010.MRSN, 0453010.MR): These parts maintain identical electrical characteristics and DC cold resistance to the main part 0451010.NRL. Selection between these options is determined by packaging format preference (Cut Tape & Digi-Reel® vs. Tape & Reel) and inventory availability. All three carry CSA, PSE, and UL approvals. The 0451010.MRL variant offers the highest inventory level (100,200 pcs) and is suitable for high-volume production requirements.

Littelfuse NANO²® 448 Series (0448010.MR): This part provides parametric equivalence with a slightly higher melting I²t value (28 vs. 26.46) and marginally higher DC cold resistance (0.007 Ω vs. 0.0056 Ω). It is available in Cut Tape & Digi-Reel® packaging with substantial inventory (9,937 pcs). Approval agencies include CSA, UL, and PSE.

Littelfuse NANO²® 476 Series (0476010.MR, 0476010.MRSN): These parts differ significantly in breaking capacity (100A AC, 300A DC vs. 35A AC, 50A DC) and melting I²t (14.879 vs. 26.46). Selection of these parts is appropriate only when higher breaking capacity is required. DC cold resistance is higher (0.0096 Ω). Approval agency is cURus. REACH status differs between variants.

Bel Fuse Inc. 0679L Series (0679L9100-01, 0679L9100-05): These parts from an alternative manufacturer meet the same current and voltage ratings with fast-blow response. Physical dimensions differ slightly (0.240" L x 0.100" W x 0.110" H). Breaking capacity is 50A AC and 300A DC. Both variants carry AEC-Q200 and cURus approvals. The 0679L9100-01 variant has significantly higher inventory (81,508 pcs), supporting extended supply chain flexibility.

Selection Criteria Based on Product Status and Compliance:

• All substitute parts are active in production status
• All parts maintain ROHS3 compliance and MSL 1 rating
• Approval agency coverage varies; verify specific regulatory requirements for target application
• Packaging format selection (Tape & Reel vs. Cut Tape & Digi-Reel®) depends on assembly equipment and production volume

Frequently Asked Questions (FAQ)

Q: Can 0451010.MRL be used as a direct replacement for 0451010.NRL?

A: Yes. Both parts are from the NANO²® 451 series with identical current rating (10 A), voltage rating (125 V AC/DC), response time (fast blow), DC cold resistance (0.0056 Ω), and melting I²t (26.46). The difference is packaging format: 0451010.NRL is Tape & Reel, while 0451010.MRL is Cut Tape & Digi-Reel®. Electrical and mechanical compatibility is maintained.

Q: What is the difference between the Littelfuse NANO²® 451 and NANO²® 476 series?

A: The primary difference is breaking capacity. NANO²® 451 parts have 35A AC / 50A DC breaking capacity, while NANO²® 476 parts have 100A AC / 300A DC breaking capacity. NANO²® 476 also has lower melting I²t (14.879 vs. 26.46) and higher DC cold resistance (0.0096 Ω vs. 0.0056 Ω). Select NANO²® 476 only when higher breaking capacity is required.

Q: Are Bel Fuse 0679L parts compatible with Littelfuse NANO²® parts?

A: Bel Fuse 0679L parts meet the same current rating (10 A), voltage rating (125 V AC/DC), response time (fast blow), and mounting type (surface mount). Physical dimensions differ slightly (0.240" L x 0.100" W x 0.110" H vs. 0.240" L x 0.106" W x 0.106" H). Functional compatibility is maintained for circuit protection applications, but PCB layout and mechanical fit must be verified.

Q: What packaging formats are available?

A: Substitute parts are available in two packaging formats: Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel®. Tape & Reel is standard for high-volume automated assembly. Cut Tape & Digi-Reel® is suitable for lower-volume production or mixed-component assembly. Selection depends on assembly equipment capability and production volume requirements.

Q: Which substitute part has the highest inventory availability?

A: Bel Fuse 0679L9100-01 has the highest inventory at 81,508 pcs. Among Littelfuse parts, 0451010.MRL offers the highest inventory at 100,200 pcs. Both support extended supply chain flexibility for high-volume production.

Q: Do all substitute parts carry the same regulatory approvals?

A: No. Littelfuse NANO²® 451 and 453 series parts carry CSA, PSE, and UL approvals. NANO²® 448 carries CSA, UL, and PSE. NANO²® 476 carries cURus approval. Bel Fuse 0679L parts carry AEC-Q200 and cURus approvals. Verify specific regulatory requirements for your target application and select accordingly.

Q: What is the significance of DC cold resistance differences?

A: DC cold resistance affects voltage drop and power dissipation during normal operation. The main part 0451010.NRL has 0.0056 Ω. Substitute parts range from 0.0056 Ω to 0.0096 Ω. Higher resistance results in greater voltage drop and heat generation. For applications sensitive to voltage drop or thermal performance, select parts with lower DC cold resistance values.