Littelfuse 0255.250M Equivalent & Substitute Parts

Part Overview

The Littelfuse 0255.250M is a 250 mA, 125 V AC/DC board mount axial fuse with fast blow response characteristics. 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 is designed for through-hole mounting applications requiring reliable overcurrent protection in low-voltage circuits.

Substiute Parts

0255.250M

LittelfuseIn Stock: 11260255.250M Datasheet

Current PartRFQ

0251.250MXL

LittelfuseIn Stock: 10320251.250MXL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete 0255.250M is based on electrical and mechanical parameter equivalence within the Littelfuse axial fuse product family. The substitute part 0251.250MXL maintains identical electrical specifications: 250 mA current rating, 125 V AC/DC voltage rating, and fast blow response time. Both parts are board mount through-hole axial fuses with equivalent breaking capacity ratings of 50A AC and 300A DC.

The substitution is valid based on the following key parameters:

• Current Rating: 250 mA (identical)
• Voltage Rating: 125 V AC / 125 V DC (identical)
• Response Time: Fast Blow (identical)
• Mounting Type: Through Hole (identical)
• Fuse Type: Board Mount Axial (identical)
• Breaking Capacity: 50A AC, 300A DC (identical)

Physical dimensions differ slightly between the two parts. The 0251.250MXL has a larger diameter (0.110" vs 0.095") while maintaining the same length (0.280"). This dimensional difference must be evaluated against available board space in the target application.

Parameter Comparison

Engineering Selection Recommendations

The 0251.250MXL is the manufacturer-recommended substitute for the obsolete 0255.250M. Both parts carry equivalent electrical ratings and breaking capacity specifications, ensuring functional compatibility in overcurrent protection applications.

The 0251.250MXL offers advantages in terms of product lifecycle status and regulatory compliance. As an active product, it benefits from ongoing manufacturing support and availability. The part is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The original 0255.250M is RoHS non-compliant, making the 0251.250MXL the preferred choice for new designs and systems requiring compliance documentation.

The primary consideration for substitution is the dimensional difference in fuse diameter (0.110" vs 0.095"). Verification of available board space and fuse holder compatibility is necessary prior to implementation. The axial length remains constant at 0.280", and both parts maintain identical electrical performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can the 0251.250MXL directly replace the 0255.250M in existing applications?

A: Electrical substitution is valid based on identical current rating, voltage rating, response time, and breaking capacity. Physical compatibility depends on fuse holder design and available board space. The 0251.250MXL has a larger diameter (0.110" vs 0.095"), which must be confirmed against the existing fuse holder specifications.

Q: What is the difference in product status between these two parts?

A: The 0255.250M is classified as obsolete and no longer in active production. The 0251.250MXL is an active product with ongoing manufacturing support and availability. For new designs and long-term system support, the 0251.250MXL is the appropriate selection.

Q: Are there compliance differences between the two parts?

A: The 0255.250M is RoHS non-compliant. The 0251.250MXL is ROHS3 compliant and REACH unaffected. Both parts carry CSA and UL-based approvals (UL for the original part, cURus for the substitute). Systems requiring RoHS compliance documentation must use the 0251.250MXL.

Q: Do the electrical characteristics remain identical between the two parts?

A: Yes. Both parts have identical current rating (250 mA), voltage rating (125 V AC/DC), response time (fast blow), and breaking capacity (50A AC, 300A DC). Electrical performance in overcurrent protection applications is equivalent.

Q: What physical dimensions should be verified before substitution?

A: The fuse diameter differs between parts: 0255.250M is 0.095" diameter, while 0251.250MXL is 0.110" diameter. The axial length is identical at 0.280" for both parts. Confirm that the fuse holder or socket can accommodate the larger diameter of the substitute part.