Littelfuse 0235003.H Glass Cartridge Fuse 3A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0235003.H is a 3A 250VAC fast-blow glass cartridge fuse in 5x20mm form factor, designed for circuits requiring holder-mounted protection. This part is classified as obsolete. Equivalent and substitute parts are necessary to maintain circuit protection functionality in applications where the original part is no longer available or where active-status alternatives with improved compliance are preferred.

Key Parameters

Parameter	Value
Current Rating	3 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Fast Blow
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	100A
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

Current Rating: 3 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Fast Blow (exact match required)
Mounting Type: Requires Holder (exact match required)

Parts are grouped into three categories:

Parametric Equivalents (Littelfuse Series 235): Parts 0235003.HXP, 0235003.MXP, and 0235003.VXP meet all electrical and mechanical parameters. These are active-status alternatives to the obsolete 0235003.H, with improved RoHS3 compliance and expanded approval certifications.

Direct Manufacturer Equivalent (SCHURTER): Part 0034.3880 meets all core electrical and mechanical parameters from an alternative manufacturer, with active product status and RoHS3 compliance.

Manufacturer Recommended Alternatives: Parts 5MF 3 -R (Bel Fuse), BK/GMA-3-R, BK1/GMA-3-R, and GMA-3-R (Eaton) meet all electrical and mechanical parameters with active status and RoHS3 compliance.

Non-Equivalent Part: BP/GMA-3A operates at 125VAC and does not meet the 250VAC requirement; it is not a substitute.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (AC)	Package / Case	Response Time	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Product Status	RoHS Status
0235003.H	Littelfuse Inc.	3	250 V	5mm x 20mm	Fast Blow	100A	8.62	0.0348	Obsolete	RoHS non-compliant
0235003.HXP	Littelfuse Inc.	3	250 V	5mm x 20mm	Fast Blow	100A	8.395	0.0347	Active	ROHS3 Compliant
0235003.MXP	Littelfuse Inc.	3	250 V	5mm x 20mm	Fast Blow	100A	8.395	0.0347	Active	ROHS3 Compliant
0235003.VXP	Littelfuse Inc.	3	250 V	5mm x 20mm	Fast Blow	100A	8.395	0.0347	Active	ROHS3 Compliant
0034.3880	SCHURTER Inc.	3	250 V	5mm x 20mm	Fast Blow	100A	6.8	Not provided	Active	ROHS3 Compliant
5MF 3 -R	Bel Fuse Inc.	3	250 V	5mm x 20mm	Fast Blow	200A	13	0.03	Active	ROHS3 Compliant
BK/GMA-3-R	Eaton - Electronics Division	3	250 V	5mm x 20mm	Fast Blow	100A	8.8	0.039	Active	ROHS3 Compliant
BK1/GMA-3-R	Eaton - Electronics Division	3	250 V	5mm x 20mm	Fast Blow	100A	8.8	0.039	Active	ROHS3 Compliant
GMA-3-R	Eaton - Electronics Division	3	250 V	5mm x 20mm	Fast Blow	100A	8.8	0.039	Active	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain electrical and mechanical equivalence to the 0235003.H across current rating, voltage, package, and response characteristics. Selection should prioritize active-status parts with current compliance certifications.

Littelfuse Series 235 Alternatives (0235003.HXP, 0235003.MXP, 0235003.VXP): These are direct Littelfuse replacements with ROHS3 compliance and expanded approval certifications (CE, CSA, KC, PSE, UL). Melting I²t values are slightly lower (8.395 vs. 8.62), indicating marginally faster response. These are preferred for applications requiring original manufacturer continuity.

SCHURTER 0034.3880: Offers active status and ROHS3 compliance with cULus certification. Melting I²t of 6.8 indicates faster response than the original part. Suitable for applications where alternative manufacturer sourcing is acceptable.

Bel Fuse 5MF 3 -R: Active status with ROHS3 compliance and CE, CSA, cULus, PSE certifications. Higher breaking capacity (200A vs. 100A) and melting I²t (13 vs. 8.62) indicate slower response. Appropriate for applications requiring higher fault current handling.

Eaton GMA Series (BK/GMA-3-R, BK1/GMA-3-R, GMA-3-R): All three variants are active with ROHS3 compliance and CSA, PSE, UL certifications. Melting I²t of 8.8 closely matches the original part. These are suitable for direct substitution in existing designs.

Frequently Asked Questions (FAQ)

Q: Can I use BP/GMA-3A as a substitute for 0235003.H?

A: No. BP/GMA-3A operates at 125VAC, while 0235003.H requires 250VAC operation. This part does not meet the voltage requirement and is not a valid substitute.

Q: What is the difference between the Littelfuse 235 series alternatives (HXP, MXP, VXP)?

A: All three parts (0235003.HXP, 0235003.MXP, 0235003.VXP) are electrically and mechanically equivalent. The primary difference is packaging: HXP and VXP are supplied in bulk packaging, while MXP is also bulk. Inventory levels differ. Selection can be based on availability and packaging requirements.

Q: Why does 5MF 3 -R have a higher breaking capacity (200A) than the original part (100A)?

A: Breaking capacity is a design characteristic of the fuse element and holder combination. The 5MF 3 -R is rated for higher fault current interruption. This does not affect normal operation at 3A but provides enhanced protection in high-fault-current environments.

Q: Are all substitute parts RoHS compliant?

A: All active-status substitute parts listed are ROHS3 compliant. The original 0235003.H is RoHS non-compliant. If RoHS compliance is required, any of the listed active alternatives are suitable.

Q: What does melting I²t indicate, and why do values vary?

A: Melting I²t is a measure of the fuse element's thermal energy absorption capacity before melting. Lower values indicate faster response to overcurrent. Variations between parts reflect different fuse element designs. All listed parts maintain fast-blow response characteristics and are electrically equivalent for 3A 250VAC applications.

Q: Can I substitute parts from different manufacturers interchangeably?

A: Yes, provided all electrical parameters (current, voltage, response time) and mechanical parameters (package, mounting type) match. All listed substitutes meet these criteria and are mechanically compatible with standard 5x20mm fuse holders.

Q: What certifications should I verify for my application?

A: Verify that the selected substitute part carries certifications required by your application standards. Common certifications include UL, CSA, CE, and PSE. All listed active-status parts carry at least one of these certifications.

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