Littelfuse 0230004.HXSW Glass Axial Fuse 4A 125VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230004.HXSW is a 4 A, 125 V AC glass cartridge fuse with axial through-hole mounting. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. The fuse features slow-blow response characteristics, a 400 A breaking capacity, and operates across a temperature range of -55°C to 125°C. Direct substitutes maintain identical electrical and mechanical specifications while offering improved compliance status and broader certification coverage.

Key Parameters

Parameter	Value
Current Rating	4 A
Voltage Rating (AC)	125 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	Cartridge, Non-Standard (Axial)
Mounting Type	Through Hole
Size / Dimension	0.177" Dia x 0.571" L (4.50mm x 14.50mm)
Breaking Capacity @ Rated Voltage	400 A
Melting I²t	148
Operating Temperature Range	-55°C to 125°C
DC Cold Resistance	0.0256 Ohms

Substitute Part Grouping Explanation

Substitution of the 0230004.HXSW is determined by strict equivalence across the following parameters:

Current Rating: 4 A (exact match required)
Voltage Rating (AC): 125 V (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)
Mounting Type: Through Hole (exact match required)
Size / Dimension: 0.177" Dia x 0.571" L (4.50mm x 14.50mm) (exact match required)
Breaking Capacity @ Rated Voltage: 400 A (exact match required)
Melting I²t: 148 (exact match required)
Operating Temperature Range: -55°C to 125°C (exact match required)

All substitute parts listed below meet these criteria. The primary distinction between the main part and substitutes is product status (obsolete vs. active) and regulatory compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage AC	Voltage DC	Response Time	Package	Size (Dia x L)	Breaking Capacity	Melting I²t	DC Cold Resistance	Operating Temp	Product Status	RoHS Status	Inventory
0230004.HXSW	Littelfuse Inc.	4 A	125 V	—	Slow Blow	Cartridge, Non-Standard (Axial)	0.177" x 0.571" (4.50mm x 14.50mm)	400 A	148	0.0256 Ω	-55°C to 125°C	Obsolete	RoHS Non-Compliant	879 Pcs
0230004.HXSP	Littelfuse Inc.	4 A	125 V	125 V	Slow Blow	Cartridge, Non-Standard (Axial)	0.177" x 0.571" (4.50mm x 14.50mm)	400 A	148	0.0258 Ω	-55°C to 125°C	Active	ROHS3 Compliant	787 Pcs
0230004.HXAP	Littelfuse Inc.	4 A	125 V	125 V	Slow Blow	Cartridge, Non-Standard (Axial)	0.177" x 0.571" (4.50mm x 14.50mm)	400 A	148	0.0258 Ω	-55°C to 125°C	Active	ROHS3 Compliant	667 Pcs
0230004.HXP	Littelfuse Inc.	4 A	125 V	125 V	Slow Blow	Cartridge, Non-Standard (Axial)	0.177" x 0.571" (4.50mm x 14.50mm)	400 A	148	0.0258 Ω	-55°C to 125°C	Active	ROHS3 Compliant	959 Pcs
0230004.MXP	Littelfuse Inc.	4 A	125 V	125 V	Slow Blow	Cartridge, Non-Standard (Axial)	0.177" x 0.571" (4.50mm x 14.50mm)	400 A	148	0.0258 Ω	-55°C to 125°C	Active	ROHS3 Compliant	4013 Pcs
0230004.MXSP	Littelfuse Inc.	4 A	125 V	125 V	Slow Blow	Cartridge, Non-Standard (Axial)	0.177" x 0.571" (4.50mm x 14.50mm)	400 A	148	0.0258 Ω	-55°C to 125°C	Active	ROHS3 Compliant	808 Pcs
0230004.VXP	Littelfuse Inc.	4 A	125 V	125 V	Slow Blow	Cartridge, Non-Standard (Axial)	0.177" x 0.571" (4.50mm x 14.50mm)	400 A	148	0.0258 Ω	-55°C to 125°C	Active	ROHS3 Compliant	838 Pcs
0230004.VXSP	Littelfuse Inc.	4 A	125 V	125 V	Slow Blow	Cartridge, Non-Standard (Axial)	0.177" x 0.571" (4.50mm x 14.50mm)	400 A	148	0.0258 Ω	-55°C to 125°C	Active	ROHS3 Compliant	847 Pcs

Engineering Selection Recommendations

All substitute parts are functionally equivalent to the 0230004.HXSW and maintain identical electrical and mechanical specifications. The primary selection criteria are product status and regulatory compliance:

Active Product Status: All substitute parts (0230004.HXSP, 0230004.HXAP, 0230004.HXP, 0230004.MXP, 0230004.MXSP, 0230004.VXP, 0230004.VXSP) are classified as active products, ensuring long-term availability and manufacturing support compared to the obsolete main part.

RoHS3 Compliance: All substitute parts are ROHS3 compliant, whereas the main part is RoHS non-compliant. This distinction is significant for applications subject to RoHS regulations.

Certification Coverage: Substitute parts carry expanded certification coverage (CE, CSA, PSE, UL, UR) compared to the main part (cUL, METI), providing broader regulatory acceptance across international markets.

DC Voltage Rating: Substitute parts are rated for 125 V DC in addition to 125 V AC, extending application flexibility. The main part specifies AC voltage only.

Inventory Availability: Part 0230004.MXP offers the highest inventory level (4013 Pcs), followed by 0230004.HXP (959 Pcs) and 0230004.VXP (838 Pcs), supporting supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 0230004.HXSW with any of the listed substitute parts?

A: Yes. All substitute parts meet the identical electrical and mechanical specifications: 4 A current rating, 125 V AC voltage rating, slow-blow response, 400 A breaking capacity, and 4.50mm x 14.50mm axial cartridge package. Direct substitution is electrically and mechanically compatible.

Q: What is the difference between the main part and the substitutes?

A: The main part (0230004.HXSW) is obsolete and RoHS non-compliant. All substitute parts are active products with ROHS3 compliance, expanded certifications (CE, CSA, PSE, UL, UR), and dual AC/DC voltage ratings (125 V AC / 125 V DC). The DC cold resistance is marginally higher in substitutes (0.0258 Ω vs. 0.0256 Ω), which is within acceptable tolerance for this component class.

Q: Are there any packaging differences between these parts?

A: All parts use identical packaging: Cartridge, Non-Standard (Axial), Through Hole mounting. Physical dimensions are identical at 0.177" diameter x 0.571" length (4.50mm x 14.50mm).

Q: Which substitute part should I select for new designs?

A: Selection should be based on inventory availability, certification requirements, and supply chain strategy. Part 0230004.MXP offers the highest inventory level. Parts 0230004.HXSP, 0230004.HXAP, and 0230004.HXP provide balanced availability with active product status and full compliance certifications.

Q: Do the substitute parts have the same thermal characteristics?

A: Yes. All parts operate across the identical temperature range of -55°C to 125°C and maintain the same melting I²t value of 148, ensuring equivalent thermal performance and protection characteristics.

Q: Is the DC voltage rating on substitute parts relevant if my application uses AC only?

A: No. If your application operates on 125 V AC exclusively, the DC voltage rating does not affect performance. The AC specifications remain identical across all parts. The DC rating on substitutes simply provides additional application flexibility.

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