Littelfuse 03181.25VXP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 03181.25VXP is a 1.25 A, 250 V AC/DC fast-blow glass cartridge fuse designed for through-hole mounting in 3AB and 3AG package configurations. This component is classified as Active product status and maintains full compliance with international safety standards including CE, CSA, KC, PSE, and UL certifications. Substitute parts are identified when equivalent electrical and mechanical parameters are required for component replacement, inventory optimization, or supply chain continuity.

Substiute Parts

03181.25VXP

LittelfuseIn Stock: 81403181.25VXP Datasheet

Current PartRFQ

03181.25HXP

Littelfuse Inc.In Stock: 125503181.25HXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 03181.25VXP are identified based on strict equivalence across the following critical parameters:

• Current Rating: 1.25 A
• Voltage Rating (AC): 250 V
• Fuse Type: Cartridge, Glass
• Response Time: Fast Blow
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial)
• Breaking Capacity @ Rated Voltage: 100 A
• Melting I²t: 1.45
• Operating Temperature Range: -55°C ~ 125°C
• DC Cold Resistance: 0.1385 Ohms
• Mounting Type: Through Hole
• Approval Agencies: CE, CSA, KC, PSE, UL
• RoHS Status: ROHS3 Compliant

The substitute part 03181.25HXP meets all specified electrical and mechanical parameters, ensuring direct functional equivalence for circuit protection applications requiring identical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

Both the 03181.25VXP and 03181.25HXP are Active product status components manufactured by Littelfuse with identical electrical and mechanical specifications. Selection between these parts may be based on inventory availability, supply chain logistics, or procurement requirements. Both parts maintain full compliance with CE, CSA, KC, PSE, and UL certifications and are ROHS3 compliant, ensuring regulatory conformance across global markets. The 03181.25HXP currently maintains higher inventory levels (1167 Pcs) compared to the 03181.25VXP (736 Pcs), which may influence procurement decisions for high-volume applications.

Frequently Asked Questions (FAQ)

Q: Can the 03181.25HXP be used as a direct replacement for the 03181.25VXP?

A: Yes. Both parts are identical in all critical electrical and mechanical parameters, including current rating, voltage rating, fuse type, response time, package configuration, breaking capacity, melting I²t, operating temperature range, and DC cold resistance. Direct substitution is supported without circuit modification.

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

A: No. Both the 03181.25VXP and 03181.25HXP carry identical approval certifications: CE, CSA, KC, PSE, and UL. Both are ROHS3 compliant and REACH unaffected.

Q: What is the significance of the 3AB and 3AG package designation?

A: The 3AB and 3AG designations refer to standardized glass cartridge fuse package formats with dimensions of 1/4" x 1-1/4" (6.99mm x 32.72mm). These packages are industry-standard for through-hole mounting applications and ensure mechanical compatibility across equivalent fuse designs.

Q: How do the melting I²t values affect substitution compatibility?

A: The melting I²t value (1.45 for both parts) defines the thermal energy required to melt the fuse element. Identical I²t values ensure that both parts respond identically to overcurrent conditions, maintaining circuit protection performance and timing characteristics.

Q: What does "Fast Blow" response time indicate?

A: Fast Blow indicates that the fuse element melts rapidly under overcurrent conditions, typically within milliseconds. This response characteristic is identical for both the 03181.25VXP and 03181.25HXP, ensuring equivalent circuit protection behavior.

Q: Are these parts suitable for both AC and DC applications?

A: Yes. Both parts are rated for 250 V AC/DC operation, supporting applications in both alternating and direct current circuits within the specified voltage and current parameters.