Littelfuse 0232010.M Glass Cartridge Fuse 10A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0232010.M is a 10A 250VAC glass cartridge fuse in 5x20mm form factor, designed for medium-blow response applications requiring a holder for installation. This part is classified as obsolete, making identification of active equivalent and substitute components essential for ongoing system support and procurement planning. The fuse provides 100A breaking capacity at rated voltage with a melting I²t of 298.5, suitable for general-purpose circuit protection in AC and DC applications across the -55°C to 125°C operating temperature range.

Key Parameters

Parameter	Value
Current Rating	10 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 to 125°C
DC Cold Resistance	0.0061 Ohms

Substitute Part Grouping Explanation

Substitution for the 0232010.M is determined by strict equivalence across the following critical parameters: current rating (10A), voltage rating (250VAC), fuse type (cartridge glass), physical package (5x20mm), response time (medium blow), and mounting configuration (requires holder). All identified substitutes maintain these core electrical and mechanical specifications, ensuring direct functional replacement without circuit redesign or holder modification.

The two substitute parts identified—0232010.MXP (Littelfuse) and MSC-10A (OptiFuse)—satisfy all substitution criteria. Both are active products with current manufacturing status, addressing the obsolescence of the original 0232010.M.

Parameter Comparison

Parameter	0232010.M (Main)	0232010.MXP (Littelfuse)	MSC-10A (OptiFuse)
Current Rating (Amps)	10 A	10 A	10 A
Voltage Rating - AC	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Package / Case	5mm x 20mm	5mm x 20mm	5mm x 20mm
Response Time	Medium Blow	Medium Blow	Medium Blow
Mounting Type	Requires Holder	Requires Holder	Requires Holder
Breaking Capacity @ Rated Voltage	100A	100A	200A
Melting I²t	298.5	290.665	257.8
Operating Temperature Range	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C
DC Cold Resistance (Ohms)	0.0061	0.0059	Not specified
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the obsolete 0232010.M, the Littelfuse 0232010.MXP represents the primary substitution path. This part maintains identical electrical and mechanical specifications while offering active product status and ROHS3 compliance. The 0232010.MXP is functionally equivalent with marginally lower melting I²t (290.665 versus 298.5), remaining within acceptable tolerance for medium-blow fuse applications.

The OptiFuse MSC-10A provides an alternative substitute with equivalent core parameters and higher breaking capacity (200A versus 100A). This part carries cULus and UL 248 certifications and ROHS3 compliance. The MSC-10A exhibits lower melting I²t (257.8), which may affect response characteristics in specific circuit conditions.

Selection between 0232010.MXP and MSC-10A should be based on certification requirements specific to the application, with preference for the Littelfuse variant when melting I²t tolerance is critical to circuit protection strategy.

Frequently Asked Questions (FAQ)

Q: Can the 0232010.MXP directly replace the obsolete 0232010.M without circuit modification?

A: Yes. The 0232010.MXP maintains identical current rating (10A), voltage rating (250VAC), fuse type (cartridge glass), physical dimensions (5x20mm), response time (medium blow), and mounting configuration (requires holder). No circuit redesign or holder replacement is required.

Q: What is the significance of the melting I²t difference between substitutes?

A: Melting I²t determines the thermal energy required to melt the fuse element. The 0232010.MXP (290.665) and MSC-10A (257.8) both differ from the original 0232010.M (298.5). These variations affect response time under transient overcurrent conditions. Selection should verify compatibility with circuit protection coordination requirements.

Q: Why does the MSC-10A have higher breaking capacity (200A) than the main part (100A)?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. The MSC-10A's higher rating (200A) provides enhanced fault protection capability while maintaining the same 10A nominal current rating. This does not affect normal operation but offers greater safety margin in high-fault-current environments.

Q: Are all substitutes RoHS compliant?

A: The 0232010.M is RoHS non-compliant. Both substitutes—0232010.MXP and MSC-10A—are ROHS3 compliant, meeting current environmental and regulatory standards for electronic components.

Q: What certifications should I verify for my specific application?

A: The 0232010.MXP carries CE, KC, and PSE approvals. The MSC-10A carries cULus and UL 248 certifications. Verify that the selected substitute meets the certification requirements mandated by your application's regulatory framework and end-use market.

Q: Can I use MSC-10A and 0232010.MXP interchangeably in the same circuit?

A: Both parts are functionally equivalent for direct replacement of the 0232010.M. However, differences in melting I²t and breaking capacity may affect circuit protection coordination in systems with multiple fuses or sensitive load protection requirements. Verify compatibility with your specific circuit protection strategy before substitution.

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