Littelfuse 0273004.V Board Mount Fuse 4A 125VAC/VDC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0273004.V is a 4A 125VAC/VDC board mount fuse with radial, can, vertical package configuration. This through-hole component is designed for circuit protection in electronic assemblies requiring fast-blow response characteristics. The part is currently active in production with full compliance to RoHS3, REACH, and major approval agencies including UL, CSA, and QPL certification. Substitute parts are identified when electrical ratings, mechanical dimensions, and approval certifications remain identical across the product line.

Substiute Parts

0273004.V

Littelfuse Inc.In Stock: 10880273004.V Datasheet

Current PartRFQ

0273004.H

Littelfuse Inc.In Stock: 13750273004.H Datasheet

Parametric EquivalentRFQ

0279004.V

Littelfuse Inc.In Stock: 8110279004.V Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0273004.V are identified based on strict electrical and mechanical parameter matching. The substitution criteria include:

• 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 Configuration: 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)
• Compliance: RoHS3 Compliant, REACH Unaffected (exact match required)

Two substitute parts meet all substitution criteria: 0273004.H (MICRO™ 273 series) and 0279004.V (MICRO™ 279 series). Both parts are manufactured by Littelfuse Inc. and maintain identical electrical performance and mechanical compatibility with the primary part number.

Parameter Comparison

Engineering Selection Recommendations

All three parts—0273004.V, 0273004.H, and 0279004.V—are active production components from Littelfuse Inc. with identical electrical specifications and mechanical compatibility. Selection between these parts is based on availability and supply chain considerations rather than technical performance differences.

The 0273004.V and 0273004.H are both members of the MICRO™ 273 series and are fully interchangeable. The 0279004.V belongs to the MICRO™ 279 series but maintains complete electrical and mechanical equivalence.

All three parts carry full compliance certifications from UL, CSA, and QPL, with RoHS3 compliance and REACH unaffected status. Operating temperature range, breaking capacity, and all electrical parameters are identical across all three part numbers.

Frequently Asked Questions (FAQ)

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

A: Yes. Both parts are members of the MICRO™ 273 series with identical current rating (4A), voltage rating (125VAC/VDC), response time (Fast Blow), package configuration (Radial, Can, Vertical), and all electrical parameters. Physical dimensions and mounting characteristics are identical.

Q: What is the difference between 0273004.V and 0279004.V?

A: The primary difference is series designation: 0273004.V belongs to MICRO™ 273 series while 0279004.V belongs to MICRO™ 279 series. All electrical ratings, mechanical dimensions, breaking capacity, and approval certifications are identical. Both are functionally equivalent for circuit protection applications.

Q: Are all three parts suitable for the same PCB layout?

A: Yes. All three parts share identical physical dimensions (0.250" Dia x 0.350" H), mounting type (Through Hole), and package configuration (Radial, Can, Vertical). PCB footprints and mounting hole patterns are compatible across all three part numbers.

Q: Do all substitute parts have the same approval certifications?

A: Yes. All three parts carry identical certifications: UL, CSA, and QPL approval. RoHS3 compliance and REACH unaffected status are consistent across 0273004.V, 0273004.H, and 0279004.V.

Q: What is the melting I²t specification and why is it important?

A: Melting I²t of 1.38 defines the thermal energy required to melt the fuse element. This parameter is identical across all three parts and determines the fuse's response to overcurrent conditions. Identical I²t values ensure equivalent circuit protection performance.

Q: Can these fuses be used in both AC and DC circuits?

A: Yes. All three parts are rated for 125V AC and 125V DC operation. The identical voltage ratings across both AC and DC ensure compatibility with mixed-signal or dual-voltage circuit designs.