Littelfuse 031801.5MXP Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 031801.5MXP is a 1.5 A, 250 V AC/DC fast-blow glass cartridge fuse designed for through-hole mounting in 3AB and 3AG package configurations. This fuse is actively produced and maintains full compliance with international safety standards including CE, CSA, PSE, and UL certifications. Identifying equivalent substitute parts ensures design flexibility, supply chain continuity, and component availability across manufacturing cycles.

Substiute Parts

031801.5MXP

Littelfuse Inc.In Stock: 1788031801.5MXP Datasheet

Current PartRFQ

031801.5HXP

Littelfuse Inc.In Stock: 1343031801.5HXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 031801.5MXP are identified based on strict electrical and mechanical parameter equivalence. The following criteria determine substitutability:

• Current Rating: 1.5 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity: 100 A (exact match required)
• Melting I²t: 2.35 (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Approval Agencies: CE, CSA, PSE, UL (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

The substitute part 031801.5HXP meets all these criteria and is therefore electrically and mechanically interchangeable with the main part number.

Parameter Comparison

Engineering Selection Recommendations

Both the 031801.5MXP and 031801.5HXP are active products manufactured by Littelfuse Inc. with identical electrical and mechanical specifications. Selection between these parts may be based on inventory availability and supply chain considerations. Both parts maintain full compliance with CE, CSA, PSE, and UL certifications and are ROHS3 compliant, ensuring regulatory conformance in all supported markets. The interchangeability of these components is confirmed by matching all critical parameters including current rating, voltage rating, fuse type, response time, package configuration, breaking capacity, thermal characteristics, and resistance specifications.

Frequently Asked Questions (FAQ)

Q: Can 031801.5HXP be used as a direct replacement for 031801.5MXP?

A: Yes. The 031801.5HXP is a direct parametric equivalent with identical electrical and mechanical specifications across all critical parameters including current rating, voltage rating, fuse type, response time, package configuration, and thermal operating range.

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

A: No. Both parts carry identical approval certifications: CE, CSA, PSE, and UL. Both are ROHS3 compliant and REACH unaffected.

Q: What determines if a fuse can substitute for the 031801.5MXP?

A: Substitutability is determined by exact matching of current rating (1.5 A), voltage rating (250 V AC), fuse type (Cartridge, Glass), response time (Fast Blow), package configuration (3AB, 3AG, 1/4" x 1-1/4"), mounting type (Through Hole), breaking capacity (100 A), melting I²t (2.35), operating temperature range (-55°C ~ 125°C), and regulatory compliance status.

Q: Are the physical dimensions identical?

A: Yes. Both parts have identical dimensions of 0.275" diameter by 1.288" length (6.99mm x 32.72mm) and are compatible with the same through-hole mounting footprints.

Q: What is the DC cold resistance specification?

A: Both parts have a DC cold resistance of 0.1036 Ohms, ensuring identical electrical behavior in circuit applications.