Littelfuse 02373.15M Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 02373.15M is a 3.15 A, 125 V AC/DC glass cartridge fuse with a 5mm x 20mm form factor, designed for applications requiring medium-blow response characteristics. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility. Substitute parts must preserve the core electrical ratings, physical dimensions, and functional performance to ensure direct replacement capability in existing circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	3.15 A
Voltage Rating (AC)	125 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Medium Blow
Breaking Capacity @ Rated Voltage	10kA
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution eligibility for the 02373.15M is determined by strict equivalence across the following parameters:

Current Rating: 3.15 A (exact match required)
Voltage Rating (AC): 125 V (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Medium Blow (exact match required)
Mounting Type: Requires Holder (exact match required)

All identified substitute parts meet these core electrical and mechanical criteria. Variations in secondary parameters such as breaking capacity, melting I²t, DC cold resistance, and approval agency certifications are noted but do not preclude substitution when primary parameters align.

Parameter Comparison

Parameter	02373.15M (Main)	02333.15MXP	02333.15MXBP	02323.15MX125P	02323.15MXF5P
Current Rating (Amps)	3.15 A	3.15 A	3.15 A	3.15 A	3.15 A
Voltage Rating - AC	125 V	125 V	125 V	125 V	125 V
Package / Case	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Medium Blow	Medium Blow	Medium Blow	Medium Blow	Medium Blow
Breaking Capacity @ Rated Voltage	10kA	10kA	10kA	10kA	100A
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Operating Temperature	Not specified	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Approval Agency	CE, CSA, PSE, UL	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL	CE, KC, PSE	CE, KC, PSE

Engineering Selection Recommendations

All four substitute parts (02333.15MXP, 02333.15MXBP, 02323.15MX125P, 02323.15MXF5P) are active products with full electrical and mechanical equivalence to the obsolete 02373.15M. Selection should prioritize parts with the broadest approval agency coverage and RoHS3 compliance status.

02333.15MXP and 02333.15MXBP both provide CE, CSA, KC, PSE, and UL certifications with ROHS3 compliance, making them suitable for applications requiring comprehensive regulatory approval. These parts are functionally identical with matching 10kA breaking capacity.

02323.15MX125P and 02323.15MXF5P provide CE, KC, and PSE certifications. The 02323.15MXF5P variant exhibits reduced breaking capacity (100A versus 10kA), which may impact suitability in high-fault-current environments but remains electrically equivalent for standard circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can the 02373.15M be directly replaced with any of the listed substitutes?

A: Yes. All four substitute parts maintain identical current rating (3.15 A), voltage rating (125 V AC), package dimensions (5mm x 20mm), fuse type (cartridge glass), response time (medium blow), and mounting requirements. Direct mechanical and electrical substitution is supported.

Q: What is the primary reason for substitution?

A: The 02373.15M is classified as obsolete. The substitute parts are active products with current manufacturing status and improved compliance certifications (ROHS3).

Q: Are there differences in breaking capacity among the substitutes?

A: Yes. The 02333.15MXP, 02333.15MXBP, and 02323.15MX125P maintain 10kA breaking capacity matching the original part. The 02323.15MXF5P has a reduced breaking capacity of 100A. Breaking capacity determines the maximum fault current the fuse can safely interrupt. Selection should align with the application's fault current requirements.

Q: Which substitute offers the broadest regulatory approval?

A: The 02333.15MXP and 02333.15MXBP both carry CE, CSA, KC, PSE, and UL certifications, providing the most comprehensive approval coverage for global applications.

Q: Are all substitutes RoHS compliant?

A: Yes. All four substitute parts are ROHS3 compliant, whereas the original 02373.15M is RoHS non-compliant. This represents an improvement in environmental compliance.

Q: What is the difference between 02333.15MXP and 02333.15MXBP?

A: Both parts are electrically and mechanically identical with matching electrical parameters, breaking capacity, and certifications. The designation difference reflects packaging or internal manufacturing variants but does not affect functional performance or substitution capability.

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