Littelfuse 0237002.M Glass Cartridge Fuse 2A 125VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0237002.M is a 2A 125VAC glass cartridge fuse with 5x20mm dimensions, designed for general-purpose circuit protection in AC/DC applications. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. Active alternatives from Littelfuse's current product lines provide direct functional replacement with improved compliance status and expanded certification coverage.

Key Parameters

Parameter	Value
Current Rating	2 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
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitution for the 0237002.M is based on strict electrical and mechanical parameter matching:

Matching Criteria:

Current Rating: 2 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 (exact match required)
Mounting Type: Requires Holder (exact match required)

All five substitute parts meet these criteria and are manufactured by Littelfuse Inc. The primary distinction between substitutes is product status (active vs. obsolete) and compliance certifications. Series 233 parts (0233002.MXP, 0233002.MXBP, 0233002.MXF34P) and Series 232 parts (0232002.MX125P, 0232002.MXF22125P) are all active products with ROHS3 compliance, whereas the original 0237002.M is obsolete and RoHS non-compliant.

Parameter Comparison

Parameter	0237002.M (Main)	0233002.MXP	0232002.MX125P	0232002.MXF22125P	0233002.MXBP	0233002.MXF34P
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	2 A	2 A	2 A	2 A	2 A	2 A
Voltage Rating - AC	125 V	125 V	125 V	125 V	125 V	125 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Package / Case	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm
Response Time	Medium Blow	Medium Blow	Medium Blow	Medium Blow	Medium Blow	Medium Blow
Breaking Capacity @ Rated Voltage	10kA	10kA	10kA	10kA	10kA	10kA
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)	0.205" Dia x 0.787" L (5.20mm x 20.00mm)	0.205" Dia x 0.787" L (5.20mm x 20.00mm)	0.205" Dia x 0.787" L (5.20mm x 20.00mm)	0.205" Dia x 0.787" L (5.20mm x 20.00mm)	0.205" Dia x 0.787" L (5.20mm x 20.00mm)
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Operating Temperature	Not specified	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Approval Agency	CE, CSA, PSE, UL	CE, CSA, KC, PSE, UL	CE, KC, PSE	CE, KC, PSE	CE, CSA, KC, PSE, UL	CE, CSA, KC, PSE, UL
Melting I²t	Not specified	9.97	8.25	8.25	9.97	9.97
DC Cold Resistance	Not specified	0.0684 Ohms	0.037 Ohms	0.037 Ohms	0.0684 Ohms	0.0684 Ohms
REACH Status	Not specified	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

All five substitute parts provide direct functional replacement for the 0237002.M based on identical electrical and mechanical specifications. Selection should prioritize active product status and compliance requirements:

Series 233 Parts (0233002.MXP, 0233002.MXBP, 0233002.MXF34P): These parts offer the broadest certification coverage, including CE, CSA, KC, PSE, and UL approvals. They feature a melting I²t of 9.97 and DC cold resistance of 0.0684 Ohms. These are suitable for applications requiring comprehensive international compliance.

Series 232 Parts (0232002.MX125P, 0232002.MXF22125P): These parts provide CE, KC, and PSE certifications with a lower melting I²t of 8.25 and reduced DC cold resistance of 0.037 Ohms. These are suitable for applications where CSA and UL certifications are not required.

All substitute parts are ROHS3 compliant and REACH unaffected, addressing environmental and regulatory requirements that the obsolete 0237002.M does not meet. Operating temperature range of -55°C to 125°C is specified for all active substitutes.

Frequently Asked Questions (FAQ)

Q: Can the 0237002.M be directly replaced with any of these substitute parts?

A: Yes. All five substitute parts match the critical electrical and mechanical parameters: 2A current rating, 125V AC voltage rating, medium blow response time, 10kA breaking capacity, and 5x20mm package dimensions. Physical installation in existing fuse holders is identical.

Q: What is the primary reason to transition from the 0237002.M to a substitute?

A: The 0237002.M is classified as obsolete. Active substitutes ensure long-term availability, supply chain continuity, and compliance with current environmental regulations (ROHS3). All substitutes are manufactured by the same supplier, Littelfuse Inc.

Q: Are there differences in electrical performance between the substitute parts?

A: Yes. Series 233 parts (0233002.MXP, 0233002.MXBP, 0233002.MXF34P) have a melting I²t of 9.97 and DC cold resistance of 0.0684 Ohms. Series 232 parts (0232002.MX125P, 0232002.MXF22125P) have a melting I²t of 8.25 and DC cold resistance of 0.037 Ohms. Both configurations maintain the same response time classification (medium blow) and breaking capacity (10kA).

Q: Which substitute should I select for new designs?

A: For new designs requiring comprehensive international certifications (CSA, UL), select Series 233 parts. For applications requiring only CE, KC, and PSE certifications, Series 232 parts are suitable. All substitutes are active products with confirmed inventory availability.

Q: Are packaging options different between substitutes?

A: All substitute parts are supplied in bulk packaging. The 0237002.M was supplied with unspecified packaging. Physical dimensions and fuse holder compatibility remain identical across all parts.

Q: What certifications does each substitute carry?

A: Series 233 parts carry CE, CSA, KC, PSE, and UL certifications. Series 232 parts carry CE, KC, and PSE certifications. The original 0237002.M carried CE, CSA, PSE, and UL certifications but is no longer actively supported.

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