SCHURTER 0034.3963 Glass Fuse 2A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.3963 is a 2A 250VAC glass cartridge fuse in 5x20mm form factor, part of the FSQ series. This component requires a fuse holder for installation and is designed for fast-blow response characteristics. The part is currently in active production with 820 pieces available in new original stock. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and approval certifications to ensure direct functional interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	2 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 ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (2A), voltage rating (250VAC), fuse type (cartridge glass), and mechanical package (5x20mm). All substitute parts listed maintain these core electrical and mechanical specifications. Differences in breaking capacity, melting I²t values, and approval agency certifications are noted but do not preclude substitution when the primary electrical and dimensional parameters match. Response time classification (fast blow) is consistent across all listed equivalents.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage (V AC)	Package	Response Time	Breaking Capacity (A)	Melting I²t	Inventory (Pcs)
0034.3963	SCHURTER Inc.	2	250	5x20mm	Fast Blow	—	—	820
0034.1519	SCHURTER Inc.	2	250	5x20mm	Fast Blow	35	5.28	20622
0034.1519.G	SCHURTER Inc.	2	250	5x20mm	Fast Blow	35	5.28	821
0034.1519.TR	SCHURTER Inc.	2	250	5x20mm	Fast Blow	35	5.28	710
0034.3877	SCHURTER Inc.	2	250	5x20mm	Fast Blow	100	2.93	1840
0235002.MXP	Littelfuse Inc.	2	250	5x20mm	Fast Blow	100	2.645	9994
0235002.VXP	Littelfuse Inc.	2	250	5x20mm	Fast Blow	100	2.645	1048
0217002.HXP	Littelfuse Inc.	2	250	5x20mm	Fast Blow	35	5.73	3823
0217002.MXBP	Littelfuse Inc.	2	250	5x20mm	Fast Blow	35	5.73	1037
0217002.MXP	Littelfuse Inc.	2	250	5x20mm	Fast Blow	35	5.73	30200
0217002.TXP	Littelfuse Inc.	2	250	5x20mm	Fast Blow	35	5.73	35

Engineering Selection Recommendations

All listed substitute parts maintain the core electrical specifications (2A, 250VAC) and mechanical form factor (5x20mm) required for direct replacement in the 0034.3963 application. SCHURTER parts 0034.1519, 0034.1519.G, and 0034.1519.TR are parametric equivalents within the same manufacturer family and carry expanded approval certifications including CCC, CE, CSA, cURus, UL, and VDE. Littelfuse 217 series parts (0217002.HXP, 0217002.MXBP, 0217002.MXP, 0217002.TXP) provide equivalent electrical performance with certifications spanning BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE. Littelfuse 235 series parts (0235002.MXP, 0235002.VXP) offer higher breaking capacity (100A) with certifications including CE, CSA, K-MARK, PSE, and UL. Selection should be based on required approval certifications for the end application and available inventory levels.

Frequently Asked Questions (FAQ)

Q: Can I substitute the SCHURTER 0034.3963 with a Littelfuse part?

A: Yes. Littelfuse 217 and 235 series parts listed in the parameter comparison table are electrically and mechanically equivalent. All maintain 2A current rating, 250VAC voltage rating, and 5x20mm form factor. Verify that the required approval certifications for your application are present on the selected substitute.

Q: What is the difference between SCHURTER FSQ, FSF, and FSK series fuses?

A: These are different series designations within SCHURTER's product line. FSF 5x20 and FSK 5x20 parts listed here are parametric equivalents to the FSQ series 0034.3963, all sharing identical electrical ratings and mechanical dimensions. Series designation reflects internal product categorization and does not affect functional interchangeability.

Q: Does breaking capacity affect substitution?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. The 0034.3963 does not specify breaking capacity in the provided data. Substitute parts range from 35A to 100A breaking capacity. Selection should consider the maximum prospective fault current in your circuit. Higher breaking capacity provides additional safety margin but does not prevent substitution in applications where the specified breaking capacity is adequate.

Q: Are all listed parts ROHS3 compliant?

A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the environmental compliance status of the main part.

Q: What approval certifications should I prioritize?

A: Selection depends on your application's regulatory requirements. SCHURTER 0034.1519 series parts carry the broadest certification set including CCC, CE, CSA, cURus, UL, and VDE. Littelfuse 217 series parts include BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, and VDE. Littelfuse 235 series parts include CE, CSA, K-MARK, PSE, and UL. Confirm that your selected substitute meets all certifications required by your end-use market.

Q: Can I use these fuses in any orientation?

A: All listed parts are cartridge glass fuses requiring a fuse holder for installation. Orientation is determined by the holder design. Consult your fuse holder documentation for proper installation orientation.

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