Littelfuse 0451.062MR Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0451.062MR is a 62 mA, 125 V AC/DC surface mount board mount fuse in the NANO²® 451 series with a 2-SMD square end block package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The electrical and mechanical specifications of this fuse establish the baseline parameters for identifying compatible alternatives across active product lines.

Substiute Parts

0451.062MR

Littelfuse Inc.In Stock: 28000451.062MR Datasheet

Current PartRFQ

0448.062MR

Littelfuse Inc.In Stock: 24520448.062MR Datasheet

Parametric EquivalentRFQ

0451.062MRL

Littelfuse Inc.In Stock: 189440451.062MRL Datasheet

Parametric EquivalentRFQ

0451.062NRL

LittelfuseIn Stock: 9210451.062NRL Datasheet

Parametric EquivalentRFQ

0453.062MR

Littelfuse Inc.In Stock: 21280453.062MR Datasheet

Parametric EquivalentRFQ

0453.062NR

Littelfuse Inc.In Stock: 7890453.062NR Datasheet

Parametric EquivalentRFQ

SF-2410FP0062T-2

Bourns Inc.In Stock: 1148SF-2410FP0062T-2 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0451.062MR is determined by strict equivalence across the following parameters:

• Current Rating: 62 mA (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Package / Case: 2-SMD, Square End Block (exact match required)
• Breaking Capacity @ Rated Voltage: 50 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Approval Agency: CSA and/or UL certification (required)

All substitute parts listed below meet these electrical and mechanical criteria. Variations in product status, packaging format (tape & reel, cut tape, digi-reel), series designation, and RoHS compliance do not affect functional substitutability but may impact procurement and supply chain considerations.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the obsolete 0451.062MR, the following selection criteria apply:

Littelfuse NANO²® Series (Preferred for Direct Compatibility): The 0451.062MRL, 0451.062NRL, 0448.062MR, 0453.062MR, and 0453.062NR are all active Littelfuse products with ROHS3 compliance and full CSA/UL certification. These parts maintain identical electrical and mechanical specifications to the original 0451.062MR. Selection among these variants depends on packaging requirements: cut tape & digi-reel (0451.062MRL), tape & reel (0451.062NRL, 0448.062MR, 0453.062MR, 0453.062NR).

Cross-Manufacturer Alternative: The Bourns SF-2410FP0062T-2 (SinglFuse™ series) meets all electrical and mechanical parameters with cUL and UL certification. This part is suitable for applications where cross-manufacturer qualification is acceptable.

All substitute parts carry active product status and current compliance certifications, ensuring long-term supply chain viability and regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can the 0451.062MR be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts meet the identical electrical specifications (62 mA, 125 V AC/DC, fast blow response) and mechanical requirements (2-SMD square end block package, 50 A breaking capacity, -55°C to 125°C operating range). Functional substitution is valid across all alternatives.

Q: What is the difference between the Littelfuse NANO²® 451, 448, and 453 series fuses?

A: The series designation reflects internal design iterations within the Littelfuse product line. All three series (451, 448, 453) share identical electrical and mechanical specifications for the 62 mA, 125 V rating. Series differences do not affect substitutability.

Q: Does packaging format (tape & reel vs. cut tape) affect electrical performance?

A: No. Packaging format affects only procurement and assembly handling. The electrical and mechanical performance of the fuse element is identical regardless of packaging. Selection should be based on manufacturing process requirements.

Q: Is the Bourns SF-2410FP0062T-2 a suitable substitute for the Littelfuse 0451.062MR?

A: Yes. The Bourns part meets all specified electrical and mechanical parameters and carries cUL and UL certification. Cross-manufacturer substitution is valid for applications where multi-source qualification is acceptable.

Q: Why is the original 0451.062MR listed as obsolete?

A: The 0451.062MR has been superseded by active alternatives within the Littelfuse NANO²® product line. The 0451.062MRL and 0451.062NRL represent the current active variants with improved compliance status (ROHS3). Procurement should transition to active part numbers.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed (0451.062MRL, 0451.062NRL, 0448.062MR, 0453.062MR, 0453.062NR, and SF-2410FP0062T-2) are ROHS3 compliant. The original 0451.062MR is RoHS non-compliant, making the transition to compliant alternatives necessary for regulatory alignment.

Q: What certifications apply to all substitute parts?

A: All substitute parts carry CSA and/or UL certification (Littelfuse parts: CSA and UL; Bourns part: cUL and UL). These certifications ensure compliance with North American electrical safety standards.