Littelfuse 0318.500VXP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0318.500VXP is a 500 mA, 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 CE, CSA, and UL approval agencies. Alternative equivalent parts are necessary to support supply chain flexibility, inventory management, and continuity of production when primary stock levels fluctuate.

Substiute Parts

0318.500VXP

Littelfuse Inc.In Stock: 9850318.500VXP Datasheet

Current PartRFQ

0318.500HXP

Littelfuse Inc.In Stock: 10460318.500HXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 0318.500VXP is determined by strict equivalence across the following critical parameters:

Current Rating (500 mA), Voltage Rating AC (250 V), Response Time (Fast Blow), Package / Case (3AB, 3AG, 1/4" x 1-1/4"), Fuse Type (Cartridge, Glass), Mounting Type (Through Hole), Breaking Capacity @ Rated Voltage (35A), Melting I²t (0.483), DC Cold Resistance (0.498 Ohms), Operating Temperature Range (-55°C ~ 125°C), and Size / Dimension (0.275" Dia x 1.288" L).

All substitute parts must maintain identical electrical characteristics, mechanical dimensions, and regulatory compliance certifications to ensure direct interchangeability without circuit redesign or board-level modifications.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 0318.500VXP and 0318.500HXP maintain Active product status and carry identical regulatory certifications (CE, CSA, UL). Both components are ROHS3 compliant and REACH unaffected. Selection between these parts may be based on inventory availability and supply chain considerations, as all electrical, mechanical, and compliance parameters are equivalent.

Frequently Asked Questions (FAQ)

Q: Can the 0318.500HXP directly replace the 0318.500VXP in existing designs?

A: Yes. Both parts are parametrically equivalent across all critical specifications including current rating, voltage rating, response time, package configuration, breaking capacity, and thermal characteristics. No circuit modifications are required.

Q: Are the physical dimensions identical between these fuses?

A: Yes. Both the 0318.500VXP and 0318.500HXP share identical dimensions of 0.275" diameter by 1.288" length (6.99mm x 32.72mm) and are packaged in the same 3AB, 3AG, 1/4" x 1-1/4" axial configuration.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both components carry CE, CSA, and UL approvals and are ROHS3 compliant, ensuring equivalent compliance for applications requiring these certifications.

Q: What is the melting I²t value, and why is it important for substitution?

A: The melting I²t value is 0.483 for both parts. This parameter defines the thermal energy required to melt the fuse element and is critical for ensuring identical protection characteristics in the circuit. Equivalence in this parameter guarantees identical response behavior.

Q: Are there any differences in DC cold resistance between these parts?

A: No. Both the 0318.500VXP and 0318.500HXP have a DC cold resistance of 0.498 Ohms, ensuring identical electrical performance in DC applications.