Littelfuse 0259003.T Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0259003.T is a 3A 125VAC/125VDC board mount fuse with fast blow response time, designed for through-hole mounting applications. This component is rated for hazardous locations and features intrinsic safety certification. The part maintains active product status with robust inventory availability. Substitute parts are identified to provide alternative sourcing options while maintaining identical electrical and mechanical specifications for direct circuit board replacement.

Substiute Parts

0259003.T

Littelfuse Inc.In Stock: 10130259003.T Datasheet

Current PartRFQ

0259003.M

Littelfuse Inc.In Stock: 14110259003.M Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The Littelfuse 0259003.M qualifies as a direct substitute for the 0259003.T based on identical electrical and mechanical parameters. Substitution is valid when the following criteria are met:

• Current Rating: 3A (exact match)
• Voltage Rating: 125 VAC / 125 VDC (exact match)
• Response Time: Fast Blow (exact match)
• Mounting Type: Through Hole (exact match)
• Package / Case: Radial, Can, Horizontal (exact match)
• Physical Dimensions: 0.315" Dia x 0.512" L / 8.00mm x 13.00mm (exact match)
• Operating Temperature Range: -55°C ~ 90°C (exact match)
• Breaking Capacity: 50A AC, 300A DC (exact match)
• Approval Agencies: Baseefa, UR (exact match)
• RoHS Compliance: ROHS3 Compliant (exact match)

Both parts belong to the Littelfuse 259 series and maintain identical functional specifications for board-level circuit protection in hazardous location applications.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 0259003.T and 0259003.M are active products with full regulatory compliance. Selection between these parts is based on inventory availability and supply chain considerations rather than technical differentiation. The 0259003.M currently maintains higher inventory levels (1384 pcs vs 973 pcs), making it a viable alternative when primary part availability is constrained. Both parts carry identical Baseefa and UR approvals, ROHS3 compliance, and are suitable for hazardous location applications requiring intrinsic safety certification. Direct substitution is permissible without circuit redesign or re-qualification.

Frequently Asked Questions (FAQ)

Q: Can the 0259003.M be used as a direct replacement for the 0259003.T in existing designs?

A: Yes. Both parts are electrically and mechanically identical with matching current ratings (3A), voltage ratings (125VAC/125VDC), response time (Fast Blow), physical dimensions (0.315" Dia x 0.512" L), and regulatory approvals. Direct board-level substitution is permissible without design modification.

Q: Are there any differences in the approval certifications between these parts?

A: No. Both parts carry identical Baseefa and UR approvals and maintain ROHS3 compliance. Hazardous location application requirements are met by both variants.

Q: What is the significance of the packaging designation "Bulk"?

A: Bulk packaging indicates standard reel or tape packaging for automated assembly processes. This designation applies to both the 0259003.T and 0259003.M and does not affect electrical or mechanical compatibility.

Q: Are the melting I²t and DC cold resistance values identical?

A: Yes. Both parts specify a melting I²t of 1.27 and DC cold resistance of 0.275 Ohms, confirming thermal and electrical equivalence.

Q: Can these fuses be used interchangeably in circuits rated for 125VAC and 125VDC operation?

A: Yes. Both parts are rated for dual voltage operation (125VAC and 125VDC) with identical breaking capacity (50A AC, 300A DC) and operating temperature range (-55°C ~ 90°C), making them fully interchangeable for mixed-voltage circuit protection applications.