SCHURTER 0034.3772 Glass Cartridge Fuse 630mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.3772 is a 630mA 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 AC/DC applications with a breaking capacity of 35A at rated voltage. The part is active and in production, with ROHS3 compliance and cULus approval. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional characteristics to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	630 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 0034.3772 are classified based on strict electrical and mechanical parameter matching:

Parametric Equivalent: Parts matching all critical electrical parameters (630mA, 250VAC, slow-blow response, 5x20mm package, 35A breaking capacity) with identical functional performance but different internal characteristics (melting I²t values).

Similar Substitutes: Parts from alternative manufacturers (Littelfuse, Bel Fuse) that match the core electrical ratings (630mA, 250VAC, 5x20mm package, slow-blow response) and mechanical form factor. These parts maintain functional equivalence for circuit protection applications while offering different approval agency certifications and operating temperature ranges.

Key parameters determining substitution eligibility:

Current Rating: 630 mA (exact match required)
Voltage Rating: 250 VAC (exact match required)
Package Dimensions: 5mm x 20mm (exact match required)
Response Time: Slow Blow (exact match required)
Fuse Type: Cartridge, Glass (exact match required)

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	Approval Agency
0034.3772	SCHURTER Inc.	FSL 5x20	630 mA	250 V	Slow Blow	5mm x 20mm	35A	3.62	-40°C ~ 85°C	cULus
0034.5041	SCHURTER Inc.	FTT 5x20	630 mA	250 V	Slow Blow	5mm x 20mm	35A	13.7	-40°C ~ 85°C	cURus
0213.630MXP	Littelfuse Inc.	213	630 mA	250 V	Slow Blow	5mm x 20mm	35A	4.8	-55°C ~ 125°C	BSI, CCC, CE, CSA, SEMKO, UR, VDE
0218.630HXP	Littelfuse Inc.	218	630 mA	250 V	Slow Blow	5mm x 20mm	35A	4.675	-55°C ~ 125°C	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE
0218.630MXP	Littelfuse	218	630 mA	250 V	Slow Blow	5mm x 20mm	35A	4.675	-55°C ~ 125°C	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE
0219.630MXAP	Littelfuse Inc.	219XA	630 mA	250 V	Slow Blow	5mm x 20mm	150A	4.82	-55°C ~ 125°C	CCC, CE, CSA, SEMKO, UL, VDE
5ST 630-R	Bel Fuse Inc.	5ST	630 mA	250 V	Slow Blow	5mm x 20mm	35A	0.9	-55°C ~ 125°C	CCC, CE, CSA, cURus, IMQ, SEMKO, VDE

Engineering Selection Recommendations

SCHURTER 0034.5041 (Parametric Equivalent): Direct equivalent within SCHURTER product line. Maintains identical electrical ratings and mechanical form factor. Differs in melting I²t characteristic (13.7 vs 3.62) and approval agency (cURus vs cULus). Suitable for applications where SCHURTER series continuity is required.

Littelfuse 0213.630MXP, 0218.630HXP, 0218.630MXP: Cross-manufacturer substitutes with matching core electrical parameters. Extended operating temperature range (-55°C ~ 125°C) provides broader environmental compatibility compared to the original part (-40°C ~ 85°C). Melting I²t values (4.8, 4.675, 4.675) fall between the original and parametric equivalent. Comprehensive approval agency certifications (BSI, CCC, CE, CSA, SEMKO, UL, VDE) support global regulatory compliance.

Littelfuse 0219.630MXAP: Substitute with elevated breaking capacity (150A vs 35A). Maintains all electrical ratings and mechanical dimensions. Extended operating temperature range and comprehensive certifications. Melting I²t of 4.82 aligns with other Littelfuse alternatives.

Bel Fuse 5ST 630-R: Cross-manufacturer substitute with matching electrical and mechanical specifications. Lowest melting I²t value (0.9) among all listed alternatives. Extended operating temperature range and broad approval agency coverage (CCC, CE, CSA, cURus, IMQ, SEMKO, VDE). Mechanical dimensions show minor variation (5.10mm diameter vs 5.20mm).

Frequently Asked Questions (FAQ)

Q: Can I substitute SCHURTER 0034.3772 with SCHURTER 0034.5041? A: Yes. Both parts share identical electrical ratings (630mA, 250VAC), response time (slow-blow), and mechanical form factor (5x20mm). The primary difference is the melting I²t value (13.7 vs 3.62), which affects thermal response characteristics. Both are ROHS3 compliant and active products.

Q: What is the difference between the Littelfuse 0218.630HXP and 0218.630MXP? A: Both parts are from the Littelfuse 218 series with identical electrical ratings, response time, and melting I²t values (4.675). They differ in approval agency certifications. The 0218.630HXP includes K-MARK certification, while the 0218.630MXP does not. Both support the same operating temperature range (-55°C ~ 125°C).

Q: Why does the Littelfuse 0219.630MXAP have a higher breaking capacity (150A vs 35A)? A: The 0219.630MXAP is part of the 219XA series with enhanced breaking capacity specifications. Despite this difference, it maintains identical electrical ratings (630mA, 250VAC), response time (slow-blow), and mechanical dimensions (5x20mm), making it functionally equivalent for circuit protection applications.

Q: Is the Bel Fuse 5ST 630-R mechanically compatible with the original SCHURTER part? A: The Bel Fuse 5ST 630-R maintains the 5x20mm package standard. Mechanical dimensions show a minor diameter variation (5.10mm vs 5.20mm), which remains within standard cartridge fuse tolerances for holder compatibility. All electrical ratings and response characteristics match the original part.

Q: Which substitute part offers the broadest regulatory compliance? A: The Littelfuse 0213.630MXP provides the most comprehensive approval agency coverage, including BSI, CCC, CE, CSA, SEMKO, UR, and VDE certifications. The Bel Fuse 5ST 630-R also offers extensive compliance with CCC, CE, CSA, cURus, IMQ, SEMKO, and VDE approvals.

Q: Can I use these substitutes in applications requiring cULus certification? A: The original SCHURTER 0034.3772 carries cULus certification. The SCHURTER 0034.5041 carries cURus certification. Littelfuse and Bel Fuse alternatives carry UL certification (component of cULus/cURus frameworks). Verify specific application requirements with your regulatory compliance team.

Q: What does the melting I²t value indicate? A: Melting I²t represents the thermal energy required to melt the fuse element. Lower values indicate faster thermal response. The original part (3.62) responds faster than the parametric equivalent (13.7) but slower than the Bel Fuse alternative (0.9). Selection depends on circuit protection requirements and thermal characteristics of the protected circuit.

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