Littelfuse 0230003.HXSW Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230003.HXSW is a 3 A, 250 V AC glass cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in axial configuration. This part is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity. The 0230003 series provides multiple active alternatives that maintain core electrical and mechanical compatibility while offering enhanced compliance and certification coverage.

Key Parameters

Parameter	Value
Current Rating	3 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Mounting Type	Through Hole
Package / Case	Cartridge, Non-Standard (Axial)
Size / Dimension	0.177" Dia x 0.571" L (4.50mm x 14.50mm)
Melting I²t	77
Operating Temperature Range	-55°C ~ 125°C
DC Cold Resistance	0.038 Ohms
Series	230

Substitute Part Grouping Explanation

Substitution of the obsolete 0230003.HXSW is determined by strict equivalence across the following parameters:

Current Rating: 3 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)
Physical Dimensions: 0.177" Dia x 0.571" L (exact match required)
Melting I²t: 77 (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed maintain these core electrical and mechanical parameters. Active substitutes additionally provide DC voltage rating (125 V DC) and enhanced breaking capacity specifications not present in the obsolete main part. Substitute parts are classified as either direct manufacturer equivalents (0230003.HXSP) or parametric equivalents (0230003.HXP, 0230003.MXP, 0230003.MXF16P, 0230003.MXF17P, 0230003.MXF23P, 0230003.VXP, 0230003.VXSP).

Parameter Comparison

Part Number	Current Rating (A)	Voltage AC (V)	Voltage DC (V)	Response Time	Breaking Capacity AC	Breaking Capacity DC	DC Resistance (Ohms)	Product Status	RoHS Status
0230003.HXSW (Main)	3	250	—	Slow Blow	100 A	—	0.038	Obsolete	Non-compliant
0230003.HXSP	3	250	125	Slow Blow	35 A	10 kA	0.0383	Active	ROHS3 Compliant
0230003.HXP	3	250	125	Slow Blow	35 A	10 kA	0.0383	Active	ROHS3 Compliant
0230003.MXP	3	250	125	Slow Blow	35 A	10 kA	0.0383	Active	ROHS3 Compliant
0230003.MXF16P	3	250	125	Slow Blow	100 A	10 kA	0.0383	Active	ROHS3 Compliant
0230003.MXF17P	3	250	125	Slow Blow	100 A	10 kA	0.0383	Active	ROHS3 Compliant
0230003.MXF23P	3	250	125	Slow Blow	100 A	10 kA	0.0383	Active	ROHS3 Compliant
0230003.VXP	3	250	125	Slow Blow	100 A	10 kA	0.0383	Active	ROHS3 Compliant
0230003.VXSP	3	250	125	Slow Blow	100 A	10 kA	0.0383	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are active products manufactured by Littelfuse Inc. and maintain the core electrical and mechanical specifications of the obsolete 0230003.HXSW. The following factors apply to selection:

Product Status: The main part (0230003.HXSW) is obsolete. All substitute parts carry active product status, ensuring long-term availability and manufacturing support.

Compliance & Certifications: The obsolete main part holds CSA, METI, and UL approvals but is RoHS non-compliant. All active substitute parts are ROHS3 compliant and hold CE, CSA, PSE, and UL certifications, providing broader regulatory coverage for modern applications.

Breaking Capacity Differences: The main part specifies 100 A breaking capacity at rated voltage. Substitute parts 0230003.HXSP, 0230003.HXP, and 0230003.MXP provide 35 A AC breaking capacity. Substitute parts 0230003.MXF16P, 0230003.MXF17P, 0230003.MXF23P, 0230003.VXP, and 0230003.VXSP provide 100 A AC breaking capacity, matching the main part specification.

DC Voltage Rating: All active substitutes add 125 V DC rating, extending application scope beyond AC-only designs.

Resistance Tolerance: DC cold resistance values across all active substitutes (0.0383 Ohms) are within acceptable tolerance of the main part (0.038 Ohms).

Frequently Asked Questions (FAQ)

Q: Can 0230003.HXSP be used as a direct replacement for 0230003.HXSW?

A: Yes. The 0230003.HXSP maintains all core electrical parameters (3 A, 250 V AC, slow-blow response, 77 I²t) and physical dimensions. It is classified as a direct manufacturer equivalent and is the primary active substitute. The addition of 125 V DC rating and enhanced certifications (ROHS3, CE, PSE) makes it suitable for modern applications.

Q: What is the difference between 0230003.HXSP and 0230003.HXP?

A: Both parts are parametric equivalents with identical electrical specifications (3 A, 250 V AC, 125 V DC, slow-blow, 35 A AC breaking capacity). The primary difference is inventory availability and packaging designation. Selection between these parts depends on procurement requirements and supply chain considerations.

Q: Why do some substitutes have 100 A breaking capacity while others have 35 A?

A: Breaking capacity is a specified parameter that differs between part variants within the 0230003 series. Parts 0230003.MXF16P, 0230003.MXF17P, 0230003.MXF23P, 0230003.VXP, and 0230003.VXSP maintain the 100 A breaking capacity of the obsolete main part. Parts 0230003.HXSP, 0230003.HXP, and 0230003.MXP specify 35 A AC breaking capacity. Selection should be based on circuit protection requirements.

Q: Are all substitute parts physically identical to the main part?

A: Yes. All substitute parts share the same physical dimensions (0.177" Dia x 0.571" L / 4.50mm x 14.50mm) and axial cartridge configuration, ensuring mechanical compatibility in existing through-hole mounting applications.

Q: What certifications do the active substitutes hold?

A: All active substitute parts hold CE, CSA, PSE, and UL certifications. The obsolete main part held CSA, METI, and UL certifications. The expanded certification set of active substitutes provides compliance for broader geographic and regulatory requirements.

Q: Is the DC cold resistance difference between the main part and substitutes significant?

A: No. The main part specifies 0.038 Ohms; active substitutes specify 0.0383 Ohms. This difference of 0.0003 Ohms is negligible for circuit design purposes and falls within normal manufacturing tolerance ranges.

Q: Can I use these substitutes in both AC and DC applications?

A: The obsolete main part (0230003.HXSW) is rated for 250 V AC only. All active substitute parts are rated for both 250 V AC and 125 V DC, enabling use in dual-voltage applications. Ensure your circuit design does not exceed the 125 V DC rating.

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