Littelfuse 02302.25MXSP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 02302.25MXSP is a 2.25 A, 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, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued system support and procurement.

Key Parameters

Parameter	Value
Current Rating	2.25 A
Voltage Rating (AC)	250 V
Voltage Rating (DC)	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)
Melting I²t	39
DC Cold Resistance	0.0567 Ohms
Operating Temperature Range	-55°C ~ 125°C
Approval Agencies	CE, CSA, PSE, UL
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 02302.25MXSP is determined by strict equivalence across the following critical parameters:

Current Rating: 2.25 A (exact match required)
Voltage Ratings: 250 V AC and 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)
Size / Dimension: 0.177" Dia x 0.571" L (4.50mm x 14.50mm) (exact match required)
Melting I²t: 39 (exact match required)
DC Cold Resistance: 0.0567 Ohms (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
Approval Agencies: CE, CSA, PSE, UL (exact match required)
RoHS Status: ROHS3 Compliant (exact match required)

All four substitute parts listed below meet these criteria. The primary distinction among substitutes is the Breaking Capacity @ Rated Voltage specification, which varies between 35 A AC (02302.25MXSP, 02302.25HXP) and 100 A AC (02302.25VXP, 02302.25VXSP). This parameter does not affect substitution eligibility but may influence selection based on application requirements.

Parameter Comparison

Parameter	02302.25MXSP (Main)	02302.25HXP	02302.25MXP	02302.25VXP	02302.25VXSP
Product Status	Obsolete	Active	Active	Active	Active
Current Rating (Amps)	2.25 A	2.25 A	2.25 A	2.25 A	2.25 A
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V
Voltage Rating - DC	125 V	125 V	125 V	125 V	125 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)	Cartridge, Non-Standard (Axial)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Size / Dimension	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)	0.177" Dia x 0.571" L (4.50mm x 14.50mm)
Melting I²t	39	39	39	39	39
DC Cold Resistance	0.0567 Ohms	0.0567 Ohms	0.0567 Ohms	0.0567 Ohms	0.0567 Ohms
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Approval Agencies	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Breaking Capacity @ Rated Voltage (AC)	35 A	35 A	35 A	100 A	100 A
Breaking Capacity @ Rated Voltage (DC)	10 kA	10 kA	10 kA	10 kA	10 kA

Engineering Selection Recommendations

All four substitute parts (02302.25HXP, 02302.25MXP, 02302.25VXP, 02302.25VXSP) are active products with full compliance to CE, CSA, PSE, and UL approval agencies. Each maintains ROHS3 compliance and identical electrical and mechanical specifications to the obsolete 02302.25MXSP.

Selection between 02302.25HXP / 02302.25MXP (35 A AC breaking capacity) and 02302.25VXP / 02302.25VXSP (100 A AC breaking capacity) depends on application fault current requirements. The 35 A AC variants are suitable for circuits with lower fault current levels, while the 100 A AC variants provide enhanced breaking capacity for higher fault current environments.

Packaging availability differs: 02302.25MXSP was supplied in tape and reel format (obsolete), while all active substitutes are available in bulk packaging. Inventory levels are consistent across all active alternatives, with 959–978 units in stock.

Frequently Asked Questions (FAQ)

Q: Can 02302.25HXP, 02302.25MXP, 02302.25VXP, or 02302.25VXSP be used as direct replacements for the obsolete 02302.25MXSP?

A: Yes. All four parts are parametric equivalents with identical current rating (2.25 A), voltage ratings (250 V AC / 125 V DC), fuse type (cartridge, glass), response time (slow blow), physical dimensions (0.177" Dia x 0.571" L), and thermal characteristics. All maintain the same approval certifications and RoHS compliance.

Q: What is the difference between the 35 A AC and 100 A AC breaking capacity variants?

A: Breaking capacity defines the maximum fault current the fuse can safely interrupt without rupturing the fuse body. The 35 A AC variants (02302.25HXP, 02302.25MXP) are suitable for standard industrial circuits. The 100 A AC variants (02302.25VXP, 02302.25VXSP) provide enhanced fault current handling for applications with higher available short-circuit current. Selection depends on the circuit's maximum prospective fault current.

Q: Are there packaging differences between the main part and substitutes?

A: Yes. The obsolete 02302.25MXSP was supplied in tape and reel packaging. All active substitutes are supplied in bulk packaging. This does not affect electrical or mechanical compatibility; only procurement and handling procedures differ.

Q: Do all substitutes carry the same regulatory approvals?

A: Yes. All substitute parts carry identical approval certifications: CE, CSA, PSE, and UL. All are ROHS3 compliant. Regulatory compliance is maintained across all alternatives.

Q: What is the operating temperature range for these fuses?

A: All parts, including the main part and all substitutes, operate within the range of -55°C to 125°C. This specification is identical across all variants.

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