Littelfuse 0232003.MXF22P Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0232003.MXF22P is a 3 A, 250 V AC/DC glass cartridge fuse with a 5mm x 20mm form factor. This fuse is designed for circuits requiring medium-blow response characteristics and operates across a temperature range of -55°C to 125°C. The part is actively produced and maintains full compliance with international safety standards including CE, KC, and PSE certifications. Substitute parts are identified when equivalent electrical and mechanical parameters are required for component sourcing, inventory management, or design flexibility.

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 to 125°C
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 0232003.MXF22P 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 to 125°C (exact match required)
Mounting Type: Requires Holder (exact match required)

All identified substitutes meet these core electrical and mechanical specifications. Variations in secondary parameters such as melting I²t, DC cold resistance, and approval agency certifications do not preclude substitution eligibility when primary parameters align.

Parameter Comparison

Parameter	0232003.MXF22P (Littelfuse)	0232003.MXP (Littelfuse)	0234003.MXBP (Littelfuse)	MSC-3A (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 to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder
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
Product Status	Active	Active	Active	Active
Approval Agency	CE, KC, PSE	CE, KC, PSE	CE, CSA, K-MARK, PSE, UL	cULus, UL 248

Engineering Selection Recommendations

All four parts listed maintain active product status and full RoHS3 compliance. Selection among these substitutes should be based on the following considerations:

Littelfuse 0232003.MXF22P and 0232003.MXP: These parts are functionally identical across all primary electrical and mechanical parameters, including melting I²t and DC cold resistance. Both carry CE, KC, and PSE certifications. The 0232003.MXP offers higher inventory availability (8421 units versus 1143 units).

Littelfuse 0234003.MXBP: This part meets all core substitution criteria but operates under the 234 series designation. It carries expanded approval certifications including CSA, K-MARK, and UL in addition to CE and PSE. The melting I²t value (26.24) and DC cold resistance (0.0431 Ohms) differ from the primary part, reflecting different thermal and electrical characteristics within the same functional envelope.

OptiFuse MSC-3A: This part provides an alternative manufacturer source while maintaining all critical electrical and mechanical specifications. It carries cULus and UL 248 certifications. The melting I²t value (15.5) is lower than the primary part, indicating faster thermal response. HTSUS classification differs from Littelfuse parts.

Frequently Asked Questions (FAQ)

Q: Can 0232003.MXP be used as a direct replacement for 0232003.MXF22P?

A: Yes. Both parts share identical electrical ratings (3 A, 250 V AC), fuse type (cartridge, glass), package dimensions (5mm x 20mm), response time (medium blow), and operating temperature range (-55°C to 125°C). Melting I²t and DC cold resistance values are identical.

Q: What is the difference between 0234003.MXBP and 0232003.MXF22P?

A: Both parts meet the core substitution criteria for current rating, voltage, package, and response time. The 0234003.MXBP operates under a different series designation (234 versus 232) and exhibits different melting I²t (26.24 versus 17.19) and DC cold resistance (0.0431 versus 0.0226 Ohms) values. The 0234003.MXBP carries additional UL and CSA certifications.

Q: Can OptiFuse MSC-3A replace Littelfuse parts in all applications?

A: OptiFuse MSC-3A meets all primary electrical and mechanical specifications. It carries cULus and UL 248 certifications. The melting I²t value (15.5) is lower than the Littelfuse 0232003.MXF22P (17.19), indicating faster thermal response. Verify that the application's thermal response requirements are compatible with this characteristic.

Q: Are all substitute parts compatible with the same fuse holder?

A: Yes. All parts share the identical 5mm x 20mm package dimensions and require a holder for mounting. Physical compatibility is assured across all listed substitutes.

Q: What certifications apply to each part?

A: Littelfuse 0232003.MXF22P and 0232003.MXP carry CE, KC, and PSE certifications. Littelfuse 0234003.MXBP carries CE, CSA, K-MARK, PSE, and UL certifications. OptiFuse MSC-3A carries cULus and UL 248 certifications. Select based on regional regulatory requirements.

Q: Do all parts maintain RoHS3 compliance?

A: Yes. All four parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings.

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