SCHURTER 0034.3762 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.3762 is a 100 mA, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm form factor. This fuse is designed for circuit protection in applications requiring holder-mounted cartridge fuses with slow-blow response characteristics. The part is active in production and ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response time, and approval certifications to ensure functional interchangeability in protected circuit applications.

Key Parameters

Parameter	Value
Current Rating	100 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35 A
Operating Temperature Range	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Approval Agencies	cULus

Substitute Part Grouping Explanation

Substitute parts for the SCHURTER 0034.3762 are classified based on strict electrical and mechanical parameter matching:

Direct Substitutes share identical electrical ratings (100 mA, 250 V AC), fuse type (cartridge glass), response time (slow blow), and mechanical dimensions (5mm x 20mm). These parts are functionally equivalent and can replace the main part without circuit redesign.

Similar Substitutes maintain the same core electrical parameters and mechanical form factor but may differ in secondary characteristics such as breaking capacity, melting I²t values, DC cold resistance, operating temperature range, or approval agency certifications. Selection of similar substitutes requires verification that the application tolerates these parameter variations.

Key Parameters for Substitution:

Current Rating: 100 mA (mandatory match)
Voltage Rating: 250 V AC (mandatory match)
Fuse Type: Cartridge, Glass (mandatory match)
Response Time: Slow Blow (mandatory match)
Package Dimensions: 5mm x 20mm (mandatory match)
Breaking Capacity: 35 A minimum acceptable
Approval Certifications: Must include at least one common agency (UL, CE, CSA, or equivalent)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (mA)	Voltage (V AC)	Response Time	Package (mm)	Breaking Capacity (A)	Melting I²t	Operating Temp (°C)	Approval Agencies	Inventory (Pcs)
0034.3762	SCHURTER Inc.	100	250	Slow Blow	5 x 20	35	0.128	-40 ~ 85	cULus	728
0239.100MXP	Littelfuse Inc.	100	250	Slow Blow	5 x 20	35	0.055	-55 ~ 125	CE, UL	2389
0218.100HXP	Littelfuse Inc.	100	250	Slow Blow	5 x 20	35	0.0482	-55 ~ 125	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	787
0218.100MXP	Littelfuse Inc.	100	250	Slow Blow	5 x 20	35	0.0482	-55 ~ 125	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE	10490
0219.100MXAP	Littelfuse Inc.	100	250	Slow Blow	5 x 20	150	0.079	-55 ~ 125	CE, SEMKO, UL	3061
5ST 100-R	Bel Fuse Inc.	100	250	Slow Blow	5.1 x 20	35	0.03	-55 ~ 125	CCC, CE, CSA, cURus, IMQ, SEMKO, VDE	6712
BK1/S506-100-R	Eaton - Electronics Division	100	250	Slow Blow	5 x 20	35	0.045	Not specified	BSI, CCC, CSA, IMQ, SEMKO, UR, VDE	1501

Engineering Selection Recommendations

Direct Substitution (Preferred):

0218.100MXP (Littelfuse Inc.) is the primary direct substitute. It maintains all electrical and mechanical parameters of the SCHURTER 0034.3762, offers extended operating temperature range (-55°C ~ 125°C), and carries comprehensive international approvals (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE). Highest inventory availability (10,490 pcs) ensures supply continuity.
0218.100HXP (Littelfuse Inc.) is an alternative direct substitute with identical electrical specifications and equivalent approval coverage. Lower inventory (787 pcs) may impact availability.

Alternative Substitutes (Conditional):

0239.100MXP (Littelfuse Inc.) is functionally equivalent with UL and CE approvals. Lower melting I²t (0.055 vs. 0.128) indicates faster thermal response; verify application tolerance for this characteristic.
0219.100MXAP (Littelfuse Inc.) offers higher breaking capacity (150 A vs. 35 A), suitable for applications requiring enhanced fault current handling. Melting I²t of 0.079 falls between the main part and other substitutes.
5ST 100-R (Bel Fuse Inc.) maintains core electrical ratings with comprehensive approvals. Dimensional tolerance (5.1mm vs. 5.0mm diameter) requires verification of holder compatibility.
BK1/S506-100-R (Eaton - Electronics Division) is electrically equivalent with broad certification coverage. Operating temperature range is not specified; confirm suitability for intended thermal environment.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts interchangeably with the SCHURTER 0034.3762?

A: Direct substitutes (0218.100MXP, 0218.100HXP) are fully interchangeable. Alternative substitutes require verification of application-specific requirements, particularly melting I²t values, breaking capacity, and operating temperature range. Dimensional tolerance of 5ST 100-R (5.1mm diameter) must be confirmed compatible with the fuse holder.

Q: What is the significance of melting I²t values in fuse selection?

A: Melting I²t represents the thermal energy required to melt the fuse element. Lower values indicate faster response to overcurrent. The SCHURTER 0034.3762 has a melting I²t of 0.128. Substitutes with lower values (0.0482 to 0.055) respond faster; higher values (0.079) respond slower. Application circuit design must tolerate the selected fuse's thermal response characteristic.

Q: Why do some substitutes have higher breaking capacity ratings?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. The SCHURTER 0034.3762 is rated 35 A. Substitutes like 0219.100MXAP (150 A) provide enhanced protection in high-fault-current environments. Higher breaking capacity does not affect normal operation but improves safety margin in fault conditions.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the environmental compliance status of the SCHURTER 0034.3762.

Q: What approval certifications should I prioritize when selecting a substitute?

A: Prioritize substitutes carrying UL and CE certifications, as these are the most widely recognized international standards. The SCHURTER 0034.3762 carries cULus approval. Direct substitutes (0218.100MXP, 0218.100HXP) include UL certification. Verify that the selected substitute's certification portfolio meets your application's regulatory requirements.

Q: Does operating temperature range affect fuse selection?

A: Yes. The SCHURTER 0034.3762 operates from -40°C to 85°C. Most substitutes extend this range to -55°C to 125°C, providing greater thermal flexibility. If your application operates within the SCHURTER range, any substitute is acceptable. For extreme temperature environments, confirm the substitute's operating range matches your requirements.

Q: Can I use 5ST 100-R if my holder is designed for 5.0mm diameter fuses?

A: The 5ST 100-R has a 5.1mm diameter versus the standard 5.0mm. Verify mechanical fit with your specific fuse holder before substitution. Improper fit may result in poor electrical contact or mechanical instability.

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