Littelfuse 0279004.V Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0279004.V is a 4 A, 125 V AC/DC board mount fuse with fast blow response characteristics, designed for through-hole radial mounting in electronic circuit protection applications. This component is classified as Active product status with full CSA, QPL, and UL approval certifications. Substitute parts are identified when equivalent electrical and mechanical parameters are required due to inventory constraints, design flexibility, or supply chain considerations.

Substiute Parts

0279004.V

Littelfuse Inc.In Stock: 8110279004.V Datasheet

Current PartRFQ

0273004.H

Littelfuse Inc.In Stock: 13750273004.H Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Littelfuse 0279004.V are identified based on strict electrical and mechanical parameter equivalence. The substitution criteria are:

• Current Rating: 4 A (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Can, Vertical (exact match required)
• Breaking Capacity: 10 kA (exact match required)
• Melting I²t: 1.38 (exact match required)
• Physical Dimensions: 0.250" Dia x 0.350" H (exact match required)
• DC Cold Resistance: 0.0202 Ohms (exact match required)
• Approval Certifications: CSA, QPL, UL (exact match required)

The Littelfuse 0273004.H meets all substitution criteria and is classified as a parametric equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 0279004.V and 0273004.H are Active product status components with identical electrical, mechanical, and compliance characteristics. Selection between these parts may be based on inventory availability. The 0273004.H currently maintains higher inventory levels (1290 Pcs) compared to the 0279004.V (736 Pcs). Both components carry full CSA, QPL, and UL certifications, ensuring compliance with industry standards. Both are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements. The series designation differs (MICRO™ 279 versus MICRO™ 273), but this distinction does not affect functional equivalence or interchangeability in circuit applications.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0273004.H be used as a direct replacement for the 0279004.V?

A: Yes. The 0273004.H is a parametric equivalent with identical electrical ratings (4 A, 125 V AC/DC), response time (Fast Blow), breaking capacity (10 kA), physical dimensions (0.250" Dia x 0.350" H), and approval certifications (CSA, QPL, UL). Both components are through-hole radial mount board mount fuses with identical DC cold resistance and melting I²t values.

Q: Are there any differences in mounting or PCB layout considerations?

A: No. Both parts share identical mounting type (Through Hole), package configuration (Radial, Can, Vertical), and physical dimensions. PCB footprints and mounting hole spacing are identical, requiring no design modifications.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both the 0279004.V and 0273004.H carry identical approval certifications (CSA, QPL, UL), are ROHS3 compliant, and are REACH unaffected. Both operate across the same temperature range (-55°C ~ 85°C).

Q: What is the difference between the MICRO™ 279 and MICRO™ 273 series designations?

A: The series designation reflects internal Littelfuse product line organization but does not indicate functional or electrical differences. Both series components meet identical performance specifications for this 4 A, 125 V fast blow fuse application.

Q: Are there any performance differences in breaking capacity or melting characteristics?

A: No. Both components have identical breaking capacity (10 kA) at rated voltage and identical melting I²t values (1.38), ensuring equivalent circuit protection performance.