Littelfuse 0230004.HXAP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230004.HXAP is a 4 A, 125 V AC/DC glass cartridge fuse with axial through-hole mounting. This fuse is designed for circuit protection in applications requiring slow-blow response characteristics. The part is active in production and widely stocked, with 667 units currently available. Alternative part numbers within the same series provide equivalent electrical and mechanical performance for applications where component availability or supply chain considerations necessitate substitution.

Substiute Parts

0230004.HXAP

Littelfuse Inc.In Stock: 6980230004.HXAP Datasheet

Current PartRFQ

0230004.HXP

Littelfuse Inc.In Stock: 9690230004.HXP Datasheet

Parametric EquivalentRFQ

0230004.MXP

Littelfuse Inc.In Stock: 40410230004.MXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Littelfuse 0230004.HXAP is based on strict electrical and mechanical parameter matching within the 230 series product line. The following criteria determine interchangeability:

Critical Parameters for Substitution:

• Current Rating: 4 A (exact match required)
• Voltage Rating: 125 V AC / 125 V DC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: Cartridge, Non-Standard (Axial) (exact match required)
• Physical Dimensions: 0.177" Dia x 0.571" L / 4.50mm x 14.50mm (exact match required)
• Breaking Capacity: 400 A (exact match required)
• Melting I²t: 148 (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• DC Cold Resistance: 0.0258 Ohms (exact match required)

The substitute parts 0230004.HXP and 0230004.MXP meet all critical electrical and mechanical parameters and are therefore direct equivalents suitable for circuit protection applications requiring identical performance characteristics.

Parameter Comparison

Engineering Selection Recommendations

All three part numbers—0230004.HXAP, 0230004.HXP, and 0230004.MXP—are active production components manufactured by Littelfuse Inc. and are ROHS3 compliant. Selection between these equivalents should be based on the following factors:

Approval Agency Compliance: The 0230004.HXAP carries UR certification, while 0230004.HXP and 0230004.MXP carry UL certification. Applications requiring specific regional or industry certifications should reference the approval agency requirements for the target market.

Inventory Availability: The 0230004.MXP offers the highest stock level at 4013 units, followed by 0230004.HXP at 959 units, and 0230004.HXAP at 667 units. Supply chain considerations may favor selection of the part with greater availability.

Electrical and Mechanical Equivalence: All three parts are electrically and mechanically identical across all specified parameters, including current rating, voltage rating, response time, physical dimensions, breaking capacity, and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Are 0230004.HXP and 0230004.MXP direct replacements for 0230004.HXAP?

A: Yes. All three part numbers are parametric equivalents with identical electrical and mechanical specifications. They share the same current rating (4 A), voltage rating (125 V AC/DC), fuse type (cartridge, glass), response time (slow blow), physical dimensions (0.177" Dia x 0.571" L), breaking capacity (400 A), and operating temperature range (-55°C ~ 125°C).

Q: What is the difference between these three part numbers?

A: The primary differences are approval agency certifications and inventory availability. The 0230004.HXAP carries UR certification, while 0230004.HXP and 0230004.MXP carry UL certification. Inventory levels differ, with 0230004.MXP having the highest stock availability.

Q: Can I use these fuses interchangeably in my circuit design?

A: Yes, provided your application does not have specific approval agency requirements that mandate a particular certification. All three parts meet identical electrical performance criteria and physical form factor requirements.

Q: What does "Slow Blow" response time mean?

A: Slow Blow fuses are designed to tolerate temporary current surges without opening the circuit, while still providing protection against sustained overcurrent conditions. This characteristic is consistent across all three equivalent part numbers.

Q: Are these fuses RoHS compliant?

A: Yes. All three part numbers are ROHS3 compliant, meeting environmental and hazardous substance restrictions for electronic components.

Q: What is the breaking capacity specification?

A: The breaking capacity of 400 A indicates the maximum fault current these fuses can safely interrupt at the rated voltage (125 V AC/DC) without hazardous failure.