Littelfuse 02291.25HXSP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 02291.25HXSP is a 1.25 A, 250 V AC / 125 V DC glass cartridge fuse in the 2AG form factor (5mm x 15mm). This slow-blow fuse is designed for circuit protection in applications requiring moderate current ratings with dual voltage capability. The part is Active status and widely stocked, making it suitable for new designs and replacement applications. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Substiute Parts

02291.25HXSP

Littelfuse Inc.In Stock: 101102291.25HXSP Datasheet

Current PartRFQ

02291.25HXP

Littelfuse Inc.In Stock: 123702291.25HXP Datasheet

Parametric EquivalentRFQ

02291.25MXP

Littelfuse Inc.In Stock: 180802291.25MXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 02291.25HXSP are identified based on electrical and mechanical parameter equivalence within the Littelfuse 229 series. Substitution is valid when all critical parameters match exactly:

• Current Rating: 1.25 A
• Voltage Rating - AC: 250 V
• Voltage Rating - DC: 125 V
• Response Time: Slow Blow
• Package / Case: 2AG, 5mm x 15mm
• Breaking Capacity @ Rated Voltage: 35 A AC, 10 kA DC
• Melting I²t: 9.8
• DC Cold Resistance: 0.146 Ohms
• Operating Temperature Range: -55°C to 125°C
• Approval Agencies: CE, CSA, PSE, UL
• RoHS Status: ROHS3 Compliant

The substitute parts 02291.25HXP and 02291.25MXP meet all these criteria and are direct parametric equivalents suitable for interchangeable use in circuit protection applications.

Parameter Comparison

Engineering Selection Recommendations

All three parts—02291.25HXSP, 02291.25HXP, and 02291.25MXP—are Active status products from Littelfuse Inc. and carry identical electrical and mechanical specifications. Selection among these parts may be based on inventory availability and procurement lead times. All parts hold the same regulatory approvals (CE, CSA, PSE, UL) and comply with ROHS3 and REACH requirements, ensuring regulatory compliance across all applications. The interchangeability of these parts supports flexible supply chain management without compromising circuit protection performance or safety standards.

Frequently Asked Questions (FAQ)

Q: Can 02291.25HXP and 02291.25MXP be used interchangeably with 02291.25HXSP?

A: Yes. All three parts are parametric equivalents with identical current ratings (1.25 A), voltage ratings (250 V AC / 125 V DC), response time (Slow Blow), package dimensions (2AG, 5mm x 15mm), and all electrical characteristics. They are direct substitutes suitable for interchangeable use in the same circuit protection application.

Q: What determines whether a fuse can substitute for the 02291.25HXSP?

A: Substitution requires exact matching of current rating, AC and DC voltage ratings, response time classification, package form factor, breaking capacity, melting I²t value, and operating temperature range. All three parts listed meet these criteria.

Q: Are there any packaging or mounting differences between these parts?

A: No. All three parts use the 2AG form factor (5mm x 15mm) and require the same holder. Mechanical and electrical mounting characteristics are identical.

Q: Do all substitute parts carry the same regulatory approvals?

A: Yes. All three parts hold CE, CSA, PSE, and UL approvals and comply with ROHS3 and REACH requirements.

Q: What is the difference between the part numbers 02291.25HXSP, 02291.25HXP, and 02291.25MXP?

A: The part numbers differ in their suffix designations (HXSP, HXP, MXP), which may indicate different packaging configurations or distribution channels within Littelfuse's product line. Electrically and mechanically, they are equivalent.