Littelfuse 0232003.MXF34P Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0232003.MXF34P is a 3 A, 250 V AC/DC glass cartridge fuse with a 5mm x 20mm form factor. This fuse is designed for applications requiring medium-blow response characteristics and is currently in active production status. Alternative equivalent parts may be required due to inventory availability, supply chain considerations, or specific certification requirements for regional compliance.

Key Parameters

Parameter	Value
Current Rating	3 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Medium Blow
Breaking Capacity @ Rated Voltage	100 A
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 0232003.MXF34P are qualified based on the following critical parameters:

Current Rating: 3 A (exact match required)
Voltage Rating: 250 V AC (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)
Breaking Capacity: 100 A (exact match required)
Operating Temperature: -55°C ~ 125°C (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed meet these core electrical and mechanical parameters. Variations in secondary characteristics such as melting I²t, DC cold resistance, and approval agencies do not preclude substitution when primary parameters align.

Parameter Comparison

Parameter	0232003.MXF34P (Main)	0232003.MXP	0234003.MXBP	MSC-3A
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	OptiFuse
Current Rating (Amps)	3 A	3 A	3 A	3 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Package / Case	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm
Response Time	Medium Blow	Medium Blow	Medium Blow	Medium Blow
Breaking Capacity @ Rated Voltage	100 A	100 A	100 A	100 A
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)	0.205" Dia x 0.787" L (5.20mm x 20.00mm)	0.205" Dia x 0.787" L (5.20mm x 20.00mm)	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Melting I²t	17.19	17.19	26.24	15.5
DC Cold Resistance (Ohms)	0.0226	0.0226	0.0431	Not specified
Approval Agency	CE, KC, PSE	CE, KC, PSE	CE, CSA, K-MARK, PSE, UL	cULus, UL 248
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All four parts listed are active products with ROHS3 compliance and meet the core electrical and mechanical specifications for direct substitution in applications requiring a 3 A, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor.

The 0232003.MXP is a direct Littelfuse equivalent with identical electrical characteristics and approval certifications to the main part number 0232003.MXF34P.

The 0234003.MXBP is a Littelfuse alternative from the 234 series with expanded approval certifications (CSA, K-MARK, UL in addition to CE and PSE). This part exhibits a higher melting I²t value (26.24 versus 17.19) and increased DC cold resistance (0.0431 versus 0.0226 Ohms), which may be relevant for specific thermal or resistance-sensitive applications.

The MSC-3A is an OptiFuse equivalent with cULus and UL 248 certifications. This part has a lower melting I²t value (15.5) compared to the main part, which may be significant in applications with strict thermal response requirements.

Selection should be based on regional certification requirements, inventory availability, and application-specific thermal or resistance characteristics.

Frequently Asked Questions (FAQ)

Q: Can the 0232003.MXP be used as a direct replacement for the 0232003.MXF34P?

A: Yes. Both parts are manufactured by Littelfuse, share identical current rating (3 A), voltage rating (250 V AC), package dimensions (5mm x 20mm), response time (Medium Blow), and approval certifications (CE, KC, PSE). They are electrically and mechanically equivalent.

Q: What is the difference between the 0234003.MXBP and the main part 0232003.MXF34P?

A: Both parts meet the core substitution criteria. The 0234003.MXBP offers additional certifications (CSA, K-MARK, UL) and has a higher melting I²t (26.24 versus 17.19) and increased DC cold resistance (0.0431 versus 0.0226 Ohms). These differences may be relevant for applications requiring specific thermal or electrical characteristics.

Q: Is the MSC-3A from OptiFuse compatible with the 0232003.MXF34P?

A: Yes. The MSC-3A meets all core electrical and mechanical parameters: 3 A current rating, 250 V AC voltage rating, 5mm x 20mm package, Medium Blow response, and 100 A breaking capacity. It carries cULus and UL 248 certifications. The lower melting I²t (15.5) should be evaluated for thermal response requirements in your specific application.

Q: Do all substitute parts require the same holder?

A: Yes. All parts listed are cartridge fuses with 5mm x 20mm dimensions and require a compatible fuse holder. Mechanical compatibility is ensured across all substitutes.

Q: Are there regional compliance considerations when selecting a substitute?

A: Yes. The 0232003.MXF34P and 0232003.MXP carry CE, KC, and PSE certifications. The 0234003.MXBP adds CSA, K-MARK, and UL certifications. The MSC-3A carries cULus and UL 248 certifications. Select based on your target market and regulatory requirements.

Q: What does the melting I²t value indicate?

A: Melting I²t is a thermal characteristic that indicates the fuse element's thermal energy absorption capacity. Variations in this parameter (17.19 for 0232003.MXF34P, 26.24 for 0234003.MXBP, and 15.5 for MSC-3A) may affect response behavior in specific thermal environments and should be evaluated for applications with strict thermal response requirements.

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