SCHURTER 0034.3771 Glass Cartridge Fuse 500mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.3771 is a 500mA 250VAC glass cartridge fuse in 5x20mm form factor, part of the FSL 5x20 series. This slow-blow fuse cartridge requires a holder for installation and is designed for circuit protection in AC/DC applications. The part maintains active product status with 942 units in current inventory. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional performance characteristics within the 5x20mm glass cartridge fuse category.

Key Parameters

Parameter	Value
Current Rating	500 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-40°C ~ 85°C
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the SCHURTER 0034.3771 are classified based on strict electrical and mechanical parameter matching:

Parametric Equivalent: Parts sharing identical current rating (500mA), voltage rating (250VAC), fuse type (cartridge glass), response time (slow blow), and package dimensions (5x20mm) with the same breaking capacity (35A) and RoHS compliance status.

Direct Manufacturer Equivalent: Parts from alternative manufacturers meeting all core electrical specifications and mechanical dimensions, with active product status and equivalent approval certifications.

Similar Substitute: Parts maintaining core electrical ratings and package form factor but with variations in melting I²t characteristics, DC cold resistance, operating temperature range, or approval agency certifications that remain within acceptable substitution parameters for the 5x20mm glass cartridge fuse category.

Key parameters determining substitution eligibility:

Current Rating: 500 mA (mandatory match)
Voltage Rating: 250 V AC (mandatory match)
Package Dimensions: 5x20mm (mandatory match)
Fuse Type: Cartridge, Glass (mandatory match)
Response Time: Slow Blow (mandatory match)
Breaking Capacity: 35A minimum
RoHS Compliance: ROHS3 Compliant (mandatory match)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating (Amps)	Voltage Rating (AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage	Melting I²t	Operating Temperature	RoHS Status	Product Status
0034.3771	SCHURTER Inc.	FSL 5x20	500 mA	250 V	Slow Blow	5mm x 20mm	35A	0.73	-40°C ~ 85°C	ROHS3 Compliant	Active
0034.5040	SCHURTER Inc.	FTT 5x20	500 mA	250 V	Slow Blow	5mm x 20mm	35A	7.9	-40°C ~ 85°C	ROHS3 Compliant	Active
0239.500MXP	Littelfuse Inc.	239	500 mA	250 V	Slow Blow	5mm x 20mm	35A	1.985	-55°C ~ 125°C	ROHS3 Compliant	Active
0214.600MXP	Littelfuse Inc.	213	500 mA	250 V	Slow Blow	5mm x 20mm	35A	2.905	-55°C ~ 125°C	ROHS3 Compliant	Active
0218.500MXP	Littelfuse Inc.	218	500 mA	250 V	Slow Blow	5mm x 20mm	35A	2.825	-55°C ~ 125°C	ROHS3 Compliant	Active
5ST 500-R	Bel Fuse Inc.	5ST	500 mA	250 V	Slow Blow	5mm x 20mm	35A	1.4	-55°C ~ 125°C	ROHS3 Compliant	Active
5TT 500-R	Bel Fuse Inc.	5TT	500 mA	250 V	Slow Blow	5mm x 20mm	100A	2.5	-55°C ~ 125°C	ROHS3 Compliant	Active

Engineering Selection Recommendations

SCHURTER 0034.5040 (Parametric Equivalent): Direct SCHURTER alternative within the same manufacturer ecosystem. Maintains identical electrical ratings, mechanical dimensions, and RoHS compliance. Suitable for direct substitution where SCHURTER series continuity is required. Approval agency: cURus.

Littelfuse 0239.500MXP (Direct Manufacturer Equivalent): Meets all core electrical and mechanical specifications with expanded operating temperature range (-55°C ~ 125°C). Holds multiple approval certifications (CE, CSA, KC, UL). Recommended for applications requiring broader temperature performance and multi-standard compliance.

Littelfuse 0218.500MXP (Similar Substitute): Highest inventory availability (15,465 units). Maintains core electrical ratings and package dimensions with comprehensive approval certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE). Suitable for high-volume applications and extended supply chain requirements.

Littelfuse 0214.600MXP (Similar Substitute): Alternative Littelfuse option with extended temperature range and broad certification coverage (BSI, CCC, CE, CSA, SEMKO, UR, VDE). Lower DC cold resistance (0.37 Ohms) compared to main part.

Bel Fuse 5ST 500-R (Similar Substitute): Highest inventory availability among all substitutes (22,671 units). Maintains core electrical specifications with comprehensive multi-standard certifications (CCC, CE, CSA, cURus, IMQ, SEMKO, VDE). Extended operating temperature range (-55°C ~ 125°C).

Bel Fuse 5TT 500-R (Similar Substitute): Enhanced breaking capacity (100A vs. 35A). Suitable for applications requiring higher fault current protection. Certifications: CE, CSA, cULus. Extended operating temperature range (-55°C ~ 125°C).

Frequently Asked Questions (FAQ)

Q: Can I substitute SCHURTER 0034.3771 with SCHURTER 0034.5040? A: Yes. Both parts share identical current rating (500mA), voltage rating (250VAC), fuse type (cartridge glass), response time (slow blow), and package dimensions (5x20mm). The primary difference is melting I²t (0.73 vs. 7.9), which affects thermal response characteristics. Verify application thermal requirements before substitution.

Q: What is the difference between the Littelfuse 0239.500MXP and 0218.500MXP? A: Both maintain identical electrical ratings and package dimensions. Key differences include melting I²t (1.985 vs. 2.825), DC cold resistance (0.909 vs. 0.37 Ohms), and approval certifications. The 0218.500MXP has significantly higher inventory availability (15,465 vs. 2,300 units).

Q: Are all substitute parts compatible with the same fuse holder? A: All substitute parts maintain the 5x20mm package dimension and cartridge glass form factor, ensuring mechanical compatibility with standard 5x20mm fuse holders. Electrical compatibility is maintained across all substitutes through matching current and voltage ratings.

Q: What is the significance of melting I²t values in fuse selection? A: Melting I²t determines the thermal energy required to melt the fuse element. Lower values indicate faster thermal response; higher values indicate slower thermal response. Selection depends on application-specific inrush current and thermal tolerance requirements. All listed substitutes maintain slow-blow response classification.

Q: Which substitute offers the best supply availability? A: Bel Fuse 5ST 500-R provides the highest inventory (22,671 units), followed by Littelfuse 0218.500MXP (15,465 units). Both maintain core electrical specifications and active product status.

Q: Do all substitutes meet RoHS3 compliance? A: Yes. All listed substitute parts maintain ROHS3 Compliant status, matching the original SCHURTER 0034.3771 specification.

Q: What approval certifications should I prioritize for my application? A: Selection depends on target market and regulatory requirements. Littelfuse 0218.500MXP and Bel Fuse 5ST 500-R offer the broadest multi-standard certification coverage (CCC, CE, CSA, UL, VDE). Verify specific certifications required by your application's end-use market.

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