Littelfuse 0255007.NRT1 Equivalent & Substitute Parts

Part Overview

The Littelfuse 0255007.NRT1 is a 7A 125VAC/125VDC 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 requirements. The PICO® 255 series component requires identification of compatible alternatives that maintain electrical and mechanical compatibility while offering active product status and improved availability.

Substiute Parts

0255007.NRT1

Littelfuse Inc.In Stock: 10680255007.NRT1 Datasheet

Current PartRFQ

0251007.NRT1L

Littelfuse Inc.In Stock: 1751210251007.NRT1L Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0255007.NRT1 is determined by strict equivalence across the following critical parameters:

• Current Rating: 7 A (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Fuse Type: Board Mount, Through Hole Axial (exact match required)
• Breaking Capacity: 50A AC, 300A DC (exact match required)

The primary substitute 0251007.NRT1L from the PICO® II 251 series meets all electrical and mechanical requirements while offering active product status and significantly improved inventory availability. This part represents the manufacturer-recommended upgrade path from the obsolete 0255007.NRT1.

Parameter Comparison

Engineering Selection Recommendations

The 0251007.NRT1L is the appropriate substitute for the obsolete 0255007.NRT1 based on the following engineering criteria:

Electrical equivalence is maintained across all critical parameters: 7A current rating, 125V AC/DC voltage ratings, fast blow response, and 50A AC / 300A DC breaking capacity. Both parts carry CSA approval; the substitute adds cURus and TUV certifications, expanding compliance coverage.

Product status transition from obsolete to active ensures long-term supply chain viability and manufacturing continuity. The substitute demonstrates superior RoHS compliance (ROHS3 Compliant versus non-compliant), supporting modern environmental and regulatory requirements.

Physical dimensions show a minor increase in diameter (0.110" versus 0.095"), which must be verified against PCB footprint constraints. The axial length remains identical at 0.280", preserving board-level spacing requirements.

Frequently Asked Questions (FAQ)

Q: Can the 0251007.NRT1L be used as a direct replacement for the 0255007.NRT1?

A: Yes, provided PCB footprint accommodates the increased diameter of 0.110" (versus 0.095"). All electrical parameters, voltage ratings, current ratings, and breaking capacity are identical. Through-hole mounting and axial package configuration remain unchanged.

Q: What is the significance of the diameter difference between these parts?

A: The 0251007.NRT1L has a diameter of 0.110" compared to 0.095" for the 0255007.NRT1. This 0.015" increase must be evaluated against PCB hole sizing and component placement constraints. The length remains constant at 0.280".

Q: Does the substitute part meet current regulatory requirements?

A: The 0251007.NRT1L is ROHS3 compliant and REACH unaffected, meeting current environmental regulations. The original 0255007.NRT1 is RoHS non-compliant, making the substitute preferable for new designs subject to modern compliance standards.

Q: Are there additional certifications on the substitute part?

A: The 0251007.NRT1L carries CSA, cURus, and TUV approvals, compared to CSA and UL on the original part. These certifications support broader international market acceptance and regulatory compliance.

Q: What is the inventory availability difference?

A: The 0255007.NRT1 has 975 pieces in stock, while the 0251007.NRT1L has 175,060 pieces available. The substitute offers significantly improved supply chain availability for production planning.