Littelfuse 031501.5HXP Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 031501.5HXP is a 1.5 A, 250 V AC/DC slow-blow glass cartridge fuse designed for through-hole mounting in 3AB and 3AG package formats. This component is classified as Active product status and carries multiple international approvals including CE, CSA, PSE, and UL certifications. Glass cartridge fuses of this specification are essential in circuit protection applications where controlled current interruption and thermal response characteristics are critical design requirements. Substitute parts are identified to provide alternative sourcing options while maintaining electrical and mechanical compatibility within the same functional category.

Substiute Parts

031501.5HXP

Littelfuse Inc.In Stock: 1010031501.5HXP Datasheet

Current PartRFQ

031501.5MXP

Littelfuse Inc.In Stock: 1976031501.5MXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 031501.5HXP are identified based on strict electrical and mechanical parameter equivalence. The substitution criteria are:

• Current Rating: 1.5 A (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow 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 @ Rated Voltage: 100 A (exact match required)
• Melting I²t: 38 (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Size / Dimension: 0.275" Dia x 1.275" L (6.99mm x 32.39mm) (exact match required)
• DC Cold Resistance: 0.191 Ohms (exact match required)
• Approval Agency: CE, CSA, PSE, UL (exact match required)
• RoHS Status: ROHS3 Compliant (exact match required)

Only parts meeting all specified parameters are classified as direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

Both the 031501.5HXP and 031501.5MXP are Active product status components manufactured by Littelfuse Inc. within the 315 series. Both parts carry identical electrical specifications, mechanical dimensions, and international certifications (CE, CSA, PSE, UL). Both are ROHS3 compliant and REACH unaffected. Selection between these parts is based on availability and inventory considerations rather than technical differentiation. The 031501.5MXP currently maintains higher inventory levels (1884 Pcs) compared to the 031501.5HXP (947 Pcs), making it a viable alternative for applications requiring immediate procurement or bulk quantities.

Frequently Asked Questions (FAQ)

Q: Can the 031501.5MXP be used as a direct replacement for the 031501.5HXP?

A: Yes. Both parts are identical in all electrical and mechanical parameters, including current rating, voltage rating, fuse type, response time, package format, breaking capacity, melting I²t, operating temperature range, physical dimensions, and resistance characteristics. Both carry the same international approvals and compliance certifications.

Q: Are there any differences in the 3AB and 3AG package designations between these parts?

A: No. Both parts use the identical 3AB, 3AG package format with dimensions of 1/4" x 1-1/4" (Axial), equivalent to 0.275" Dia x 1.275" L (6.99mm x 32.39mm). These designations refer to the same physical and electrical package specification.

Q: What is the significance of the slow-blow response time for these fuses?

A: Slow-blow fuses are designed to tolerate temporary inrush currents without nuisance tripping while still providing protection against sustained overcurrent conditions. Both substitute parts maintain identical melting I²t characteristics (38), ensuring consistent thermal response behavior in circuit protection applications.

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

A: Yes. Both the 031501.5HXP and 031501.5MXP carry identical approvals from CE, CSA, PSE, and UL agencies. Both are ROHS3 compliant and REACH unaffected, meeting the same environmental and regulatory requirements.

Q: What is the DC cold resistance specification, and why is it important?

A: Both parts have a DC cold resistance of 0.191 Ohms. This specification defines the resistance of the fuse element at room temperature and is critical for calculating voltage drop across the fuse during normal circuit operation, ensuring minimal impact on circuit performance.