Littelfuse 0232001.MXW Glass Cartridge Fuse 1A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0232001.MXW is a 1 A, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor, classified as obsolete. This fuse requires a holder for installation and operates across a temperature range of -55°C to 125°C. Due to its obsolete product status, equivalent and substitute parts from active product lines are necessary for ongoing system maintenance and new designs requiring compatible fuse protection.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Medium Blow
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	100A
Operating Temperature Range	-55°C ~ 125°C
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitution for the 0232001.MXW is determined by strict equivalence across the following parameters:

Current Rating: 1 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Response Time: Medium Blow (exact match required)
Mounting Type: Requires Holder (exact match required)
Breaking Capacity @ Rated Voltage: 100A (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed maintain these core electrical and mechanical parameters. Variations in secondary characteristics such as melting I²t, DC cold resistance, and approval agencies do not affect functional substitutability within the specified operating envelope.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (AC)	Fuse Type	Package / Case	Response Time	Mounting Type	Breaking Capacity @ Rated Voltage	Operating Temperature	Product Status	RoHS Status
0232001.MXW	Littelfuse Inc.	1	250 V	Cartridge, Glass	5mm x 20mm	Medium Blow	Requires Holder	100A	-55°C ~ 125°C	Obsolete	RoHS non-compliant
0232001.MXEP	Littelfuse Inc.	1	250 V	Cartridge, Glass	5mm x 20mm (Axial)	Medium Blow	Through Hole	100A	-55°C ~ 125°C	Active	ROHS3 Compliant
0232001.MXF15P	Littelfuse Inc.	1	250 V	Cartridge, Glass	5mm x 20mm	Medium Blow	Requires Holder	100A	-55°C ~ 125°C	Active	ROHS3 Compliant
0232001.MXF34P	Littelfuse Inc.	1	250 V	Cartridge, Glass	5mm x 20mm	Medium Blow	Requires Holder	100A	-55°C ~ 125°C	Active	ROHS3 Compliant
0232001.MXF5P	Littelfuse Inc.	1	250 V	Cartridge, Glass	5mm x 20mm	Medium Blow	Requires Holder	100A	-55°C ~ 125°C	Active	ROHS3 Compliant
0232001.MXP	Littelfuse Inc.	1	250 V	Cartridge, Glass	5mm x 20mm	Medium Blow	Requires Holder	100A	-55°C ~ 125°C	Active	ROHS3 Compliant
0234001.MXBP	Littelfuse Inc.	1	250 V	Cartridge, Glass	5mm x 20mm	Medium Blow	Requires Holder	100A	-55°C ~ 125°C	Active	ROHS3 Compliant
0234001.MXP	Littelfuse Inc.	1	250 V	Cartridge, Glass	5mm x 20mm	Medium Blow	Requires Holder	100A	-55°C ~ 125°C	Active	ROHS3 Compliant
MSC-1A	OptiFuse	1	250 V	Cartridge, Glass	5mm x 20mm	Medium Blow	Requires Holder	100A	-55°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the obsolete 0232001.MXW in existing designs, select from Littelfuse Series 232 or 234 parts with "Requires Holder" mounting type: 0232001.MXF15P, 0232001.MXF34P, 0232001.MXF5P, or 0232001.MXP. These maintain identical mechanical and electrical specifications while offering active product status and ROHS3 compliance.

The 0232001.MXEP variant differs in mounting type (Through Hole vs. Requires Holder) and is suitable only for applications where axial lead configuration is acceptable.

For cross-manufacturer substitution, MSC-1A from OptiFuse meets all electrical and mechanical parameters with active product status and UL 248 certification.

Series 234 parts (0234001.MXBP, 0234001.MXP) provide equivalent functionality with enhanced approval agency coverage including CSA, K-MARK, and UL certifications, supporting broader regulatory compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can 0232001.MXEP replace 0232001.MXW directly?

A: 0232001.MXEP maintains all core electrical parameters but differs in mounting type (Through Hole vs. Requires Holder). Direct mechanical substitution is not possible without holder modification or redesign.

Q: What is the difference between Series 232 and Series 234 fuses?

A: Both series maintain identical current rating, voltage, package, and response time. Series 234 parts carry expanded approval agency certifications (CSA, K-MARK, UL) compared to Series 232. Electrical performance parameters such as melting I²t and DC cold resistance differ between series.

Q: Is MSC-1A from OptiFuse a suitable substitute?

A: MSC-1A meets all specified electrical and mechanical parameters with active product status and cULus/UL 248 certification. It is functionally equivalent for applications requiring 1 A, 250 V AC/DC protection in 5mm x 20mm cartridge form factor with holder mounting.

Q: Why is the 0232001.MXW marked as obsolete?

A: The original part is no longer in active production. Multiple active alternatives from Littelfuse Series 232 and 234 lines provide equivalent functionality and are recommended for new designs and ongoing maintenance.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed are ROHS3 compliant. The original 0232001.MXW is RoHS non-compliant. Compliance requirements should be verified against system-level regulatory requirements.

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