Littelfuse 0237003.M Glass Cartridge Fuse 3A 125VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0237003.M is a 3A 125VAC glass cartridge fuse with 5x20mm dimensions, designed for circuit protection in AC/DC applications. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications. Substitute parts must preserve the 3A current rating, 125V voltage rating, medium blow response time, 10kA breaking capacity, and 5x20mm form factor to ensure direct functional replacement without circuit redesign.

Key Parameters

Parameter	Value
Manufacturer Part Number	0237003.M
Manufacturer	Littelfuse Inc.
Current Rating	3 A
Voltage Rating (AC)	125 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Medium Blow
Breaking Capacity @ Rated Voltage	10kA
Mounting Type	Requires Holder
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the 0237003.M are qualified based on strict parametric equivalence across the following criteria:

Current Rating: 3 A (exact match required)
Voltage Rating: 125 V AC (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)
Breaking Capacity: 10kA @ rated voltage (exact match required)
Mounting Type: Requires Holder (exact match required)

All identified substitutes are manufactured by Littelfuse Inc. and maintain active product status, ensuring ongoing availability and supply chain continuity. Substitutes are grouped by series designation (232 and 233 series) while maintaining complete electrical and mechanical compatibility with the obsolete 0237003.M.

Parameter Comparison

Part Number	Series	Current Rating	Voltage Rating (AC)	Response Time	Package / Case	Breaking Capacity	Product Status	RoHS Status	Approval Agency
0237003.M	237	3 A	125 V	Medium Blow	5mm x 20mm	10kA	Obsolete	RoHS non-compliant	CE, CSA, PSE, UL
0233003.MXP	233	3 A	125 V	Medium Blow	5mm x 20mm	10kA	Active	ROHS3 Compliant	CE, CSA, KC, PSE, UL
0232003.MX125P	232	3 A	125 V	Medium Blow	5mm x 20mm	10kA	Active	ROHS3 Compliant	CE, KC, PSE
0232003.MXF22125P	232	3 A	125 V	Medium Blow	5mm x 20mm	10kA	Active	ROHS3 Compliant	CE, KC, PSE
0232003.MXF5125P	232	3 A	125 V	Medium Blow	5mm x 20mm	10kA	Active	ROHS3 Compliant	CE, KC, PSE
0233003.MXBP	233	3 A	125 V	Medium Blow	5mm x 20mm	10kA	Active	ROHS3 Compliant	CE, CSA, KC, PSE, UL
0233003.MXF4P	233	3 A	125 V	Medium Blow	5mm x 20mm	10kA	Active	ROHS3 Compliant	CE, CSA, KC, PSE, UL

Engineering Selection Recommendations

All identified substitute parts provide direct functional equivalence to the obsolete 0237003.M. Selection among active alternatives should prioritize regulatory compliance requirements for the target application:

For applications requiring CSA and UL certification in addition to CE and PSE, select 0233003.MXP, 0233003.MXBP, or 0233003.MXF4P (233 series). These parts maintain full approval agency coverage equivalent to or exceeding the original part's certifications while offering ROHS3 compliance.

For applications requiring only CE, KC, and PSE certifications, the 232 series alternatives (0232003.MX125P, 0232003.MXF22125P, 0232003.MXF5125P) provide equivalent electrical performance with ROHS3 compliance and reduced approval agency scope.

All substitute parts are manufactured by Littelfuse Inc. with active product status, ensuring supply chain availability and technical support continuity.

Frequently Asked Questions (FAQ)

Q: Can 0233003.MXP directly replace 0237003.M without circuit modification?

A: Yes. The 0233003.MXP maintains identical current rating (3A), voltage rating (125V AC), response time (medium blow), breaking capacity (10kA), and physical dimensions (5x20mm). No circuit redesign is required for direct substitution.

Q: What is the difference between 232 and 233 series substitutes?

A: Both series maintain identical electrical specifications (3A, 125V, medium blow, 10kA breaking capacity) and physical form factor (5x20mm). The 233 series (0233003.MXP, 0233003.MXBP, 0233003.MXF4P) includes CSA and UL certifications, while 232 series parts (0232003.MX125P, 0232003.MXF22125P, 0232003.MXF5125P) provide CE, KC, and PSE certifications. Selection depends on regulatory requirements for the target application.

Q: Are all substitute parts RoHS compliant?

A: Yes. All identified substitute parts are ROHS3 compliant. The original 0237003.M is RoHS non-compliant, making substitution beneficial for applications requiring RoHS compliance.

Q: Do substitute parts require the same holder as the original 0237003.M?

A: Yes. All substitute parts maintain the 5x20mm cartridge form factor and require a compatible fuse holder. Existing holders designed for 5x20mm glass cartridge fuses are compatible with all identified substitutes.

Q: What inventory levels are available for substitute parts?

A: Current inventory includes 0233003.MXP (3081 pcs), 0232003.MX125P (1095 pcs), 0232003.MXF22125P (896 pcs), 0232003.MXF5125P (1088 pcs), 0233003.MXBP (861 pcs), and 0233003.MXF4P (851 pcs).

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