SCHURTER 0034.1521 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.1521 is a 3.15 A 250 V AC/DC fast-blow glass cartridge fuse in 5mm x 20mm form factor. This fuse requires a holder for installation and is designed for circuit protection in industrial and commercial applications. The part is active in production with ROHS3 compliance and multiple international approvals including CCC, cURus, PSE/JET, and VDE. Substitute parts are necessary to address supply chain variations, regional availability, and specific application requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Current Rating	3.15 A
Voltage Rating (AC)	250 V
Response Time	Fast Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35 A
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: 3.15 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Response Time: Fast Blow (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Type: Requires Holder (exact match required)
Breaking Capacity @ Rated Voltage: 35 A (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed meet these criteria. Variations in melting I²t values, DC cold resistance, and approval agency certifications do not disqualify substitution but may influence selection based on specific application requirements and regional compliance mandates.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package / Case	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Operating Temperature	Approval Agencies	Inventory (Pcs)
0034.1521	SCHURTER Inc.	3.15	250	Fast Blow	5mm x 20mm	35	16.1	Not Specified	-55°C ~ 125°C	CCC, cURus, PSE/JET, VDE	811
02173.15HXP	Littelfuse Inc.	3.15	250	Fast Blow	5mm x 20mm	35	17.72	0.0224	-55°C ~ 125°C	BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE	3739
5SF 3.15-R	Bel Fuse Inc.	3.15	250	Fast Blow	5mm x 20mm	35	16	0.022	-55°C ~ 125°C	CCC, CE, CSA, cURus, IMQ, SEMKO, VDE	10008
BK/S500-3.15-R	Eaton - Electronics Division	3.15	250	Fast Blow	5mm x 20mm	35	13	0.025	-55°C ~ 125°C	BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE	2409
02173.15MXBP	Littelfuse	3.15	250	Fast Blow	5mm x 20mm	35	17.72	0.0224	-55°C ~ 125°C	BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE	2241
02173.15TXP	Littelfuse Inc.	3.15	250	Fast Blow	5mm x 20mm	35	17.72	0.0224	-55°C ~ 125°C	BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE	949
02173.15VXP	Littelfuse Inc.	3.15	250	Fast Blow	5mm x 20mm	35	17.72	0.0224	-55°C ~ 125°C	BSI, CE, CCC, CSA, KC, PSE, SEMKO, UR, VDE	905
06173.15MXP	Littelfuse Inc.	3.15	250	Fast Blow	5mm x 20mm	35	17.71	0.0224	-55°C ~ 125°C	CCC, CE, CSA, UR, VDE	8900
FSD-3.15A	OptiFuse	3.15	250	Fast Blow	5mm x 20mm	35	22.33	Not Specified	-55°C ~ 125°C	cURus, IEC 60127	4288

Engineering Selection Recommendations

All listed substitute parts are electrically and mechanically equivalent to the SCHURTER 0034.1521 and maintain active product status. Selection should be based on the following criteria:

Compliance Requirements: The SCHURTER 0034.1521 carries CCC, cURus, PSE/JET, and VDE approvals. For applications requiring these specific certifications, verify that the selected substitute carries matching or equivalent regional approvals. Littelfuse 02173.15HXP, 02173.15MXBP, 02173.15TXP, and 02173.15VXP carry expanded approval coverage including BSI, CE, CSA, KC, PSE, SEMKO, and UR, suitable for broader international deployment. Bel Fuse 5SF 3.15-R and Eaton BK/S500-3.15-R provide CCC and cURus coverage with additional IMQ certification. OptiFuse FSD-3.15A carries cURus and IEC 60127 approvals.

Availability: Bel Fuse 5SF 3.15-R offers the highest inventory level at 10,008 pieces. Littelfuse 06173.15MXP provides 8,900 pieces. Littelfuse 02173.15HXP offers 3,739 pieces. These options support high-volume procurement requirements.

Melting I²t Characteristics: Melting I²t values range from 13 (Eaton BK/S500-3.15-R) to 22.33 (OptiFuse FSD-3.15A). The SCHURTER 0034.1521 specifies 16.1. Littelfuse variants (02173.15HXP, 02173.15MXBP, 02173.15TXP, 02173.15VXP, 06173.15MXP) cluster at 17.71–17.72, providing thermal response characteristics closely aligned with the original part. Bel Fuse 5SF 3.15-R at 16 matches the original specification precisely.

DC Cold Resistance: Littelfuse parts specify 0.0224 Ohms. Bel Fuse 5SF 3.15-R specifies 0.022 Ohms. Eaton BK/S500-3.15-R specifies 0.025 Ohms. These variations are within acceptable tolerance for circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can I substitute any of these parts directly into an application designed for the SCHURTER 0034.1521?

A: Yes. All listed substitute parts meet the core electrical and mechanical specifications: 3.15 A current rating, 250 V AC voltage rating, fast-blow response, 5mm x 20mm package, 35 A breaking capacity, and -55°C to 125°C operating temperature range. Direct substitution is electrically and mechanically compatible.

Q: Do regional compliance certifications affect substitution eligibility?

A: Compliance certifications do not affect electrical or mechanical compatibility. However, application deployment in specific regions may require fuses carrying particular certifications. The SCHURTER 0034.1521 carries CCC, cURus, PSE/JET, and VDE approvals. If your application mandates these specific certifications, confirm that the substitute part carries equivalent regional approvals before selection.

Q: What is the significance of melting I²t values in the parameter comparison?

A: Melting I²t defines the thermal energy required to melt the fuse element and is a measure of fuse response speed under fault conditions. The SCHURTER 0034.1521 specifies 16.1. Substitute parts range from 13 to 22.33. Littelfuse variants at 17.71–17.72 and Bel Fuse 5SF 3.15-R at 16 provide thermal response characteristics closely aligned with the original. OptiFuse FSD-3.15A at 22.33 exhibits slower thermal response. For applications with strict thermal response requirements, select substitutes with melting I²t values within ±10% of the original specification.

Q: Does DC cold resistance affect circuit performance?

A: DC cold resistance values are provided for reference and range from 0.022 to 0.025 Ohms across substitute parts. These minimal resistance variations do not materially affect circuit performance in standard protection applications. For precision applications requiring specific resistance characteristics, consult application-specific design documentation.

Q: Which substitute part offers the best inventory availability?

A: Bel Fuse 5SF 3.15-R provides the highest inventory at 10,008 pieces, followed by Littelfuse 06173.15MXP at 8,900 pieces. These options support high-volume procurement and rapid fulfillment requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status and REACH Unaffected designation, meeting environmental and regulatory requirements equivalent to the SCHURTER 0034.1521.

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