Littelfuse 0230.250MXSP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0230.250MXSP is a 250 mA, 250 V AC / 125 V DC glass cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in non-standard axial configurations. This part is classified as obsolete. Equivalent and substitute parts from the Littelfuse 230 series provide active product alternatives with identical electrical and mechanical specifications, ensuring continued availability for circuit protection applications requiring this current and voltage rating.

Key Parameters

Parameter	Value
Current Rating	250 mA
Voltage Rating (AC)	250 V
Voltage Rating (DC)	125 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	Cartridge, Non-Standard (Axial)
Size / Dimension	0.177" Dia x 0.571" L (4.50mm x 14.50mm)
Mounting Type	Through Hole
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant
Approval Agencies	CE, CSA, UL

Substitute Part Grouping Explanation

Substitution within the Littelfuse 230 series is determined by equivalence across the following critical parameters: current rating (250 mA), AC voltage rating (250 V), DC voltage rating (125 V), fuse type (cartridge, glass), response time (slow blow), package configuration (non-standard axial cartridge), physical dimensions (0.177" Dia x 0.571" L), and operating temperature range (-55°C ~ 125°C). All substitute parts maintain identical electrical performance characteristics, melting I²t values (0.216), DC cold resistance (2.43 Ohms), and regulatory compliance (CE, CSA, UL certifications). Substitutes differ only in product status (active versus obsolete) and packaging format (bulk versus tape-and-reel), with one substitute offering enhanced breaking capacity at rated AC voltage.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage AC / DC	Response Time	Breaking Capacity (AC / DC)	Product Status	Inventory
0230.250MXSP	Littelfuse Inc.	250 mA	250 V / 125 V	Slow Blow	35 A / 10 kA	Obsolete	1067 Pcs
0230.250HXP	Littelfuse Inc.	250 mA	250 V / 125 V	Slow Blow	350 A / 10 kA	Active	1002 Pcs
0230.250HXSP	Littelfuse Inc.	250 mA	250 V / 125 V	Slow Blow	35 A / 10 kA	Active	1156 Pcs
0230.250MXP	Littelfuse Inc.	250 mA	250 V / 125 V	Slow Blow	35 A / 10 kA	Active	2400 Pcs
0230.250VXP	Littelfuse Inc.	250 mA	250 V / 125 V	Slow Blow	35 A / 10 kA	Active	813 Pcs

Engineering Selection Recommendations

For applications currently using the obsolete 0230.250MXSP, direct substitution is available through four active Littelfuse 230 series alternatives: 0230.250HXSP, 0230.250MXP, 0230.250VXP, and 0230.250HXP. All substitute parts maintain full compliance with CE, CSA, and UL certifications and are ROHS3 compliant. The 0230.250MXP offers the highest current inventory (2400 Pcs) and is recommended for new designs and high-volume procurement. The 0230.250HXP provides enhanced breaking capacity at rated AC voltage (350 A versus 35 A) and is suitable for applications requiring higher fault current withstand capability. The 0230.250HXSP and 0230.250VXP maintain identical electrical and mechanical specifications to the original part and are interchangeable for direct replacement in existing assemblies.

Frequently Asked Questions (FAQ)

Q: Can the 0230.250HXP be used as a direct replacement for the 0230.250MXSP?

A: Yes. The 0230.250HXP is electrically and mechanically equivalent. It maintains the same 250 mA current rating, 250 V AC / 125 V DC voltage ratings, slow-blow response, and physical dimensions. The higher breaking capacity (350 A AC versus 35 A AC) does not affect compatibility and provides additional fault current protection margin.

Q: What is the difference between the substitute parts?

A: All substitute parts share identical electrical performance: 250 mA current rating, 250 V AC / 125 V DC voltage ratings, slow-blow response, 0.216 melting I²t, and 2.43 Ohms DC cold resistance. The 0230.250HXP differs only in breaking capacity (350 A AC). Differences in part numbers reflect packaging format and manufacturing variations within the Littelfuse 230 series. All are ROHS3 compliant and hold CE, CSA, and UL certifications.

Q: Are all substitute parts currently in production?

A: Yes. All four substitute parts (0230.250HXSP, 0230.250MXP, 0230.250VXP, and 0230.250HXP) have active product status. The original 0230.250MXSP is obsolete and should be replaced with one of these active alternatives for new designs and long-term supply assurance.

Q: Do the substitute parts fit the same physical footprint?

A: Yes. All substitute parts maintain the identical non-standard axial cartridge configuration with dimensions of 0.177" diameter by 0.571" length (4.50mm x 14.50mm). Through-hole mounting compatibility is preserved across all alternatives.

Q: Which substitute part should be selected for new designs?

A: The 0230.250MXP is recommended for new designs due to highest inventory availability (2400 Pcs) and active production status. For applications requiring enhanced fault current protection, the 0230.250HXP with 350 A AC breaking capacity is the appropriate selection.

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