SCHURTER 0034.3965 Glass Cartridge Fuse 2.5A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.3965 is a 2.5A 250VAC glass cartridge fuse in 5x20mm form factor, part of the FSQ series. This component is a fast-blow fuse cartridge requiring a holder for installation. The part is active in production with 1180 units in current inventory. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response characteristics, and approval certifications to ensure direct functional interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	2.5 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Fast Blow
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

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

Current Rating: 2.5 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Package Dimensions: 5mm x 20mm (exact match required)
Response Characteristic: Fast Blow (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Configuration: Requires Holder (exact match required)

All substitute parts listed meet these core electrical and mechanical criteria. Variations in breaking capacity, melting I²t, DC cold resistance, and approval certifications are noted but do not disqualify substitution when the primary parameters align.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Package	Response Time	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ω)	Approval Agencies	Inventory (Pcs)
0034.3965	SCHURTER Inc.	2.5	250	5x20mm	Fast Blow	Not specified	Not specified	Not specified	Not specified	1180
0034.1520	SCHURTER Inc.	2.5	250	5x20mm	Fast Blow	35A	9.19	Not specified	CCC, cURus, PSE/JET, VDE	15718
023502.5HXP	Littelfuse Inc.	2.5	250	5x20mm	Fast Blow	100A	5.445	0.0437	CE, CSA, KC, PSE, UL	8618
023502.5MXP	Littelfuse Inc.	2.5	250	5x20mm	Fast Blow	100A	5.445	0.0437	CE, CSA, KC, PSE, UL	1690
023502.5VXP	Littelfuse Inc.	2.5	250	5x20mm	Fast Blow	100A	5.445	0.0437	CE, K-MARK, PSE, UL	665
5SF 2.5-R	Bel Fuse Inc.	2.5	250	5x20mm	Fast Blow	35A	10	0.026	CCC, CE, CSA, cURus, IMQ, SEMKO, VDE	2698
021702.5HXP	Littelfuse Inc.	2.5	250	5x20mm	Fast Blow	35A	9.46	0.0334	BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE	3507
021702.5MXP	Littelfuse Inc.	2.5	250	5x20mm	Fast Blow	35A	9.46	0.0334	BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE	3295
021702.5TXP	Littelfuse Inc.	2.5	250	5x20mm	Fast Blow	35A	9.46	0.0334	BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE	952
021702.5VXP	Littelfuse	2.5	250	5x20mm	Fast Blow	35A	9.46	0.0334	BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE	785
061702.5MXP	Littelfuse Inc.	2.5	250	5x20mm	Fast Blow	35A	9.46	0.0334	CCC, CE, CSA, UR, VDE	4100

Engineering Selection Recommendations

All listed substitute parts meet the core electrical and mechanical requirements for direct replacement of the SCHURTER 0034.3965. Selection should be based on:

Certification Alignment: The original part specifies no approval agencies in the provided data. Substitute parts carry certifications including CCC, CE, CSA, UL, VDE, PSE, and others. Verify that the selected substitute meets the regulatory requirements of the target application region.

Availability: SCHURTER 0034.1520 offers the highest inventory (15718 units) among SCHURTER-manufactured alternatives. Littelfuse 061702.5MXP provides 4100 units with broad certification coverage (CCC, CE, CSA, UR, VDE).

Breaking Capacity Considerations: Parts with 35A breaking capacity (SCHURTER 0034.1520, Bel Fuse 5SF 2.5-R, and Littelfuse 217 series) are suitable for standard industrial applications. Littelfuse 235 series parts offer 100A breaking capacity for higher-fault-current environments.

Thermal Performance: All parts operate across -55°C to 125°C. DC cold resistance values range from 0.026Ω to 0.0437Ω, with minimal impact on circuit operation at 2.5A rating.

Frequently Asked Questions (FAQ)

Q: Can I substitute a Littelfuse 235 series fuse (023502.5HXP) for the SCHURTER 0034.3965?

A: Yes. Both parts share identical current rating (2.5A), voltage rating (250V AC), package dimensions (5x20mm), and fast-blow response characteristic. The Littelfuse 235 series offers higher breaking capacity (100A vs. unspecified for the original), which provides additional protection margin in high-fault-current circuits without affecting normal operation.

Q: What is the difference between the Littelfuse 217 series and 235 series fuses?

A: Both series meet the core substitution criteria. The 217 series (021702.5HXP, 021702.5MXP, 021702.5TXP, 021702.5VXP) has 35A breaking capacity and melting I²t of 9.46. The 235 series (023502.5HXP, 023502.5MXP, 023502.5VXP) has 100A breaking capacity and melting I²t of 5.445. Selection depends on the fault current level expected in the application.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance status, matching the environmental requirement of the original SCHURTER 0034.3965.

Q: Do I need to change the fuse holder when substituting parts?

A: No. All substitute parts maintain the 5x20mm cartridge form factor and require a holder for installation, identical to the original part. Existing holders are compatible with all listed substitutes.

Q: Which substitute offers the best availability?

A: SCHURTER 0034.1520 provides the highest inventory at 15718 units. This part is manufactured by the same company as the original and carries certifications for CCC, cURus, PSE/JET, and VDE regions.

Q: Can I use a substitute with different DC cold resistance?

A: Yes. DC cold resistance variations (0.026Ω to 0.0437Ω) have negligible impact on circuit operation at the 2.5A rating. All listed parts are electrically equivalent for protection function.

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