Littelfuse 0255002.NRT1 Equivalent & Substitute Parts

Part Overview

The Littelfuse 0255002.NRT1 is a 2A 125VAC/VDC board mount axial fuse with fast blow response time, designed for through-hole applications. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The PICO® 255 series has been superseded by newer product lines that maintain electrical and mechanical compatibility while offering extended availability and improved compliance status.

Substiute Parts

0255002.NRT1

Littelfuse Inc.In Stock: 9940255002.NRT1 Datasheet

Current PartRFQ

0251002.NRT1L

Littelfuse Inc.In Stock: 1048180251002.NRT1L Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0255002.NRT1 is based on strict equivalence of the following critical parameters:

• Current Rating: 2 A (exact match required)
• Voltage Rating: 125 V AC / 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Through Hole Axial (exact match required)
• Breaking Capacity: 50A AC / 300A DC (exact match required)

The Littelfuse 0251002.NRT1L from the PICO® II 251 series meets all these criteria. While minor dimensional variations exist (0.110" Dia vs. 0.095" Dia), the axial through-hole mounting remains compatible with standard PCB footprints designed for this fuse category. The substitute part maintains identical electrical performance and approval certifications required for equivalent circuit protection.

Parameter Comparison

Engineering Selection Recommendations

The 0251002.NRT1L is the direct manufacturer-recommended substitute for the obsolete 0255002.NRT1. Selection of this substitute is justified by:

• Identical electrical specifications (2A, 125VAC/VDC, Fast Blow, 50A AC / 300A DC breaking capacity)
• Active product status with confirmed inventory availability (104,745 pcs in stock vs. 941 pcs for the obsolete part)
• Enhanced compliance: ROHS3 compliant vs. RoHS non-compliant; expanded approval certifications (CCC, CSA, cURus, PSE, TUV vs. CSA, UL)
• Extended operating temperature range (-55°C ~ 125°C vs. unspecified for main part)
• Improved supply chain continuity through an active product line

The minor dimensional increase in diameter (0.110" vs. 0.095") does not affect circuit protection function and remains within standard axial fuse footprint tolerances for through-hole PCB applications.

Frequently Asked Questions (FAQ)

Q: Can the 0251002.NRT1L be used as a direct replacement for the 0255002.NRT1 in existing designs?

A: Yes. Both parts share identical current rating (2A), voltage rating (125VAC/VDC), response time (Fast Blow), and breaking capacity (50A AC / 300A DC). The axial through-hole mounting is compatible with standard PCB layouts. The slight diameter increase (0.110" vs. 0.095") does not affect electrical performance or mechanical fit in typical fuse holder applications.

Q: What is the difference between the PICO® 255 and PICO® II 251 series?

A: The PICO® II 251 is the current-generation successor to the PICO® 255. Both series maintain the same electrical specifications for equivalent current and voltage ratings. The PICO® II 251 offers improved compliance (ROHS3 vs. non-compliant), expanded certifications, and active manufacturing status.

Q: Are there any packaging differences between these parts?

A: The main part (0255002.NRT1) is listed with unspecified packaging, while the substitute (0251002.NRT1L) is supplied in Cut Tape (CT) packaging. Both are axial through-hole components suitable for PCB assembly.

Q: Does the substitute part have better environmental specifications?

A: Yes. The 0251002.NRT1L specifies an operating temperature range of -55°C ~ 125°C, while the main part does not provide this specification. The substitute also includes REACH Unaffected status and ROHS3 compliance, providing better regulatory alignment for modern applications.

Q: What approval certifications should I verify for my application?

A: The substitute part (0251002.NRT1L) carries certifications from CCC, CSA, cURus, PSE, and TUV. Verify that these certifications meet your specific regional and application requirements. The main part carried CSA and UL certifications.