Littelfuse 0251003.M Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0251003.M is a 3A 125VAC/125VDC board mount fuse with axial through-hole mounting. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications. The part operates across a temperature range of -55°C to 125°C and features fast-blow response characteristics suitable for circuit protection in low-voltage applications.

Substiute Parts

0251003.M

LittelfuseIn Stock: 6820251003.M Datasheet

Current PartRFQ

0251003.MXL

Littelfuse Inc.In Stock: 94310251003.MXL Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 0251003.M is determined by strict equivalence across electrical and mechanical parameters. The primary substitute, 0251003.MXL, maintains identical specifications for current rating, voltage ratings (AC and DC), response time, breaking capacity, melting I²t, operating temperature range, and physical dimensions. Both parts belong to the PICO® II 251 series and feature identical approval certifications (CCC, CSA, cURus, PSE, TUV).

The key parameters governing substitution are:

• Current Rating: 3 A
• Voltage Ratings: 125 V AC / 125 V DC
• Response Time: Fast Blow
• Mounting Configuration: Through Hole Axial
• Physical Dimensions: 0.110" Dia x 0.280" L (2.80mm x 7.11mm)
• Breaking Capacity: 50 A AC / 300 A DC
• Melting I²t: 1.19

Parameter Comparison

Engineering Selection Recommendations

The 0251003.MXL is the direct active equivalent for the obsolete 0251003.M. Both parts are electrically and mechanically identical across all specified parameters. The primary distinction is product status: 0251003.M is obsolete while 0251003.MXL is active and maintains full manufacturing support.

An additional compliance advantage of 0251003.MXL is its ROHS3 compliance status, compared to the non-compliant status of the original part. Both parts carry identical regulatory approvals (CCC, CSA, cURus, PSE, TUV) and are suitable for applications requiring these certifications.

For new designs or component replacement in existing systems, 0251003.MXL is the appropriate selection due to its active product status and continued availability.

Frequently Asked Questions (FAQ)

Q: Can 0251003.MXL be used as a direct replacement for 0251003.M?

A: Yes. The parts are electrically and mechanically identical. All electrical parameters (current rating, voltage ratings, response time, breaking capacity, and melting I²t) are equivalent. Physical dimensions and mounting configuration are identical, enabling direct board-level substitution.

Q: What is the difference between 0251003.M and 0251003.MXL?

A: The primary differences are product status and RoHS compliance. 0251003.M is obsolete and RoHS non-compliant, while 0251003.MXL is active and ROHS3 compliant. All electrical and mechanical specifications are identical.

Q: Are there packaging differences between these parts?

A: The main part (0251003.M) is supplied in standard packaging, while the substitute (0251003.MXL) is supplied in bulk packaging. This packaging difference does not affect electrical or mechanical performance.

Q: What regulatory approvals apply to both parts?

A: Both 0251003.M and 0251003.MXL carry identical regulatory approvals: CCC, CSA, cURus, PSE, and TUV. These certifications apply to the electrical performance and safety characteristics of the fuse.

Q: Are the physical dimensions identical?

A: Yes. Both parts have identical dimensions of 0.110" diameter by 0.280" length (2.80mm x 7.11mm). The axial through-hole mounting configuration is identical, ensuring compatibility with existing PCB layouts.