Littelfuse 0234004.M Ceramic Fuse 4A 250VAC 5x20mm - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0234004.M is a ceramic cartridge fuse rated for 4A at 250VAC with a 5x20mm form factor. This part is classified as obsolete, making it necessary to identify active equivalent alternatives for ongoing procurement and system maintenance. The fuse requires a compatible holder for installation and is designed for medium-blow response applications requiring 200A breaking capacity at rated voltage.

Key Parameters

Parameter	Value
Current Rating	4 A
Voltage Rating (AC)	250 V
Form Factor	5mm x 20mm
Fuse Type	Cartridge, Ceramic
Response Time	Medium Blow
Breaking Capacity	200 A @ Rated Voltage
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution eligibility for the 0234004.M is determined by the following mandatory parameters:

Current Rating: 4 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Form Factor: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Ceramic (exact match required)
Response Time: Medium Blow (exact match required)
Mounting Type: Requires Holder (exact match required)

All identified substitutes meet these core electrical and mechanical requirements. Variations in secondary parameters such as melting I²t, DC cold resistance, operating temperature range, and approval agencies do not disqualify substitution eligibility when primary parameters align.

Parameter Comparison

Parameter	0234004.M	0234004.MXBP	0234004.MXP	0034.2522
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	SCHURTER Inc.
Current Rating (A)	4	4	4	4
Voltage Rating - AC (V)	250	250	250	250
Voltage Rating - DC (V)	Not specified	Not specified	Not specified	125
Form Factor (mm)	5 x 20	5 x 20	5 x 20	5 x 20
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Medium Blow	Medium Blow	Medium Blow	Medium Blow
Breaking Capacity @ Rated Voltage (A)	200	200	200	1000
Melting I²t	10.7	10.37	10.37	35.2
DC Cold Resistance (Ohms)	0.032	0.0304	0.0304	Not specified
Operating Temperature Range (°C)	Not specified	-55 to 125	-55 to 125	-40 to 85
Product Status	Obsolete	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Not specified	Bulk	Bulk	Bulk
Inventory Status	819 Pcs New Original	890 Pcs New Original	4345 Pcs New Original	2264 Pcs New Original

Engineering Selection Recommendations

Littelfuse 0234004.MXBP and 0234004.MXP are direct parametric equivalents manufactured by Littelfuse Inc. Both parts are active products with ROHS3 compliance and extended operating temperature ranges (-55°C to 125°C). The 0234004.MXP variant offers the highest inventory availability (4345 units) and is suitable for applications requiring modern compliance standards. The 0234004.MXBP provides an intermediate inventory option (890 units) with identical electrical characteristics.

SCHURTER 0034.2522 is a parametric equivalent from an alternative manufacturer. This part provides enhanced breaking capacity (1kA versus 200A) and includes DC voltage rating specification (125V DC). The SCHURTER part is suitable for applications requiring higher fault current handling or dual AC/DC voltage operation. Operating temperature range is -40°C to 85°C.

For new designs and procurement requiring modern compliance, Littelfuse 0234004.MXP is the preferred selection due to active product status, highest inventory availability, and ROHS3 compliance. For applications requiring enhanced breaking capacity or DC voltage specification, SCHURTER 0034.2522 is appropriate.

Frequently Asked Questions (FAQ)

Q: Can 0234004.MXBP and 0234004.MXP be used interchangeably with 0234004.M?

A: Yes. Both parts are parametric equivalents with identical current rating (4A), AC voltage rating (250V), form factor (5x20mm), fuse type (ceramic cartridge), and response time (medium blow). The primary difference is product status: 0234004.M is obsolete while both alternatives are active products with ROHS3 compliance.

Q: What is the difference between 0234004.MXBP and 0234004.MXP?

A: Both parts are electrically and mechanically identical. The primary distinction is inventory availability: 0234004.MXP has 4345 units in stock compared to 890 units for 0234004.MXBP. Both are packaged in bulk and manufactured by Littelfuse Inc.

Q: Can SCHURTER 0034.2522 replace Littelfuse 0234004.M?

A: Yes, for AC applications. The SCHURTER part meets all mandatory substitution parameters. However, it provides additional DC voltage rating (125V DC) and higher breaking capacity (1kA). The melting I²t value is higher (35.2 versus 10.7), which may affect response characteristics in specific circuit designs. Verify application requirements before selection.

Q: Are all substitute parts RoHS compliant?

A: The original 0234004.M is RoHS non-compliant. Both Littelfuse alternatives (0234004.MXBP and 0234004.MXP) and the SCHURTER 0034.2522 are ROHS3 compliant, meeting current environmental regulations.

Q: What holder is required for these fuses?

A: All listed parts require a compatible 5x20mm fuse holder. Verify holder compatibility with your specific application before installation.

Q: Does operating temperature range affect substitution?

A: Operating temperature range does not disqualify substitution. The original 0234004.M does not specify an operating temperature range. Littelfuse alternatives operate from -55°C to 125°C, and SCHURTER operates from -40°C to 85°C. Select based on your application's thermal requirements.

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