Littelfuse 0255010.M Equivalent & Substitute Parts

Part Overview

The Littelfuse 0255010.M is a 10A 125VAC/VDC board mount fuse in axial package configuration, designed for through-hole mounting applications. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing system support and new design implementations. The PICO® 255 series fuse provides fast-blow response characteristics with a breaking capacity of 50A AC and 300A DC at rated voltage.

Substiute Parts

0255010.M

Littelfuse Inc.In Stock: 7170255010.M Datasheet

Current PartRFQ

0251010.MXL

Littelfuse Inc.In Stock: 36940251010.MXL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 0255010.M is based on electrical and mechanical parameter equivalence. The primary substitute, Littelfuse 0251010.MXL, maintains identical electrical specifications: 10A current rating, 125VAC/125VDC voltage ratings, fast-blow response, and equivalent breaking capacity (50A AC, 300A DC). Both components are through-hole axial fuses suitable for board mount applications excluding cartridge-style configurations.

The substitution is valid based on the following matching parameters:

• Current Rating: 10 A (identical)
• Voltage Rating AC: 125 V (identical)
• Voltage Rating DC: 125 V (identical)
• Response Time: Fast Blow (identical)
• Mounting Type: Through Hole (identical)
• Fuse Type: Board Mount, Cartridge Style Excluded (identical)
• Breaking Capacity: 50A AC, 300A DC (identical)

Physical dimensions differ slightly (0.110" Dia vs 0.095" Dia), but both maintain the same 0.280" length and axial package configuration compatible with standard through-hole board mount applications.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 0251010.MXL is the direct substitute for the obsolete 0255010.M based on electrical parameter equivalence. The substitute part is currently in active production status with significantly higher inventory availability (3652 pcs vs 672 pcs), ensuring supply chain continuity.

The 0251010.MXL provides enhanced compliance characteristics: ROHS3 compliance versus non-compliance of the original part, and expanded approval agency certifications (CSA, cURus, TUV versus CSA, UL). The substitute includes documented thermal operating range (-55°C ~ 125°C) and DC cold resistance specifications (0.0072 Ohms) not provided for the original part.

Physical dimension variance (0.110" diameter versus 0.095" diameter) requires board layout verification to confirm PCB hole compatibility and component spacing clearance. The identical 0.280" length and axial configuration maintain functional equivalence for through-hole mounting applications.

Frequently Asked Questions (FAQ)

Q: Can the 0251010.MXL directly replace the 0255010.M in existing designs?

A: Electrical substitution is valid based on identical current rating (10A), voltage ratings (125VAC/125VDC), response time (fast-blow), and breaking capacity (50A AC, 300A DC). Physical board layout must be verified due to diameter difference (0.110" vs 0.095"). Hole spacing and component clearance confirmation is required before implementation.

Q: What is the significance of the different series designations (PICO® 255 vs PICO® II 251)?

A: The series designation indicates product generation within the Littelfuse PICO fuse family. Both series maintain equivalent electrical specifications for this 10A 125V application. The PICO® II 251 represents a current-generation product with active manufacturing status and enhanced compliance documentation.

Q: Are there compliance differences between the original and substitute parts?

A: Yes. The 0251010.MXL is ROHS3 compliant, while the 0255010.M is non-compliant. The substitute includes expanded regulatory approvals (cURus, TUV in addition to CSA). These differences favor the substitute for new designs and systems requiring modern compliance standards.

Q: What packaging format is the 0251010.MXL supplied in?

A: The 0251010.MXL is supplied in bulk packaging, compared to the original part's unspecified packaging format. Bulk packaging is standard for through-hole component distribution and does not affect functional performance or board mount compatibility.

Q: How do the thermal specifications compare?

A: The 0251010.MXL includes documented operating temperature range (-55°C ~ 125°C) and DC cold resistance (0.0072 Ohms). The original 0255010.M does not provide these specifications. The substitute's thermal range covers standard industrial and commercial operating environments.