SCHURTER 0034.3425 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.3425 is a 6.3 A, 250 V AC/DC glass cartridge fuse with slow-blow response characteristics, designed for 3AB and 3AG holder compatibility. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for continued system support and procurement.

Key Parameters

Parameter	Value
Current Rating	6.3 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Mounting Type	Requires Holder
Operating Temperature	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SCHURTER 0034.3425 is determined by strict alignment of the following parameters:

Current Rating: 6.3 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Size / Dimension: 0.250" Dia x 1.250" L (exact match required)

All identified substitute parts meet these criteria. The Littelfuse 031306.3HXP, 031306.3MXP, and 031306.3VXP are parametric equivalents with identical electrical and mechanical specifications. The SCHURTER 8020.5019 is classified as a direct manufacturer alternative but operates at 500 V AC, exceeding the rated voltage of the original part and is therefore suitable only for applications with higher voltage tolerance requirements.

Parameter Comparison

Parameter	SCHURTER 0034.3425	SCHURTER 8020.5019	Littelfuse 031306.3HXP	Littelfuse 031306.3MXP	Littelfuse 031306.3VXP
Current Rating (Amps)	6.3 A	6.3 A	6.3 A	6.3 A	6.3 A
Voltage Rating - AC	250 V	500 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Ceramic	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"	Cartridge, Non-Standard	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.252" L (6.35mm x 31.80mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)	0.250" Dia x 1.250" L (6.35mm x 31.75mm)
Breaking Capacity @ Rated Voltage	63 A	1.5 kA	200 A	200 A	200 A
Melting I²t	300	225	242	242	242
Operating Temperature	-55°C ~ 125°C	-40°C ~ 85°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active
Approval Agency	CE	cURus	CE, CSA, K-MARK, PSE, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, KC, PSE, UL
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For direct replacement of the SCHURTER 0034.3425 in 250 V AC applications, the Littelfuse 031306.3HXP, 031306.3MXP, and 031306.3VXP are parametric equivalents with active product status and comprehensive certification coverage (CE, CSA, UL, PSE, K-MARK/KC). These parts maintain identical electrical ratings, mechanical dimensions, and holder compatibility.

The SCHURTER 8020.5019 is an active alternative from the original manufacturer but operates at 500 V AC with ceramic construction. This part is suitable only for applications where the higher voltage rating is required and ceramic fuse characteristics are acceptable. The non-standard package designation indicates holder compatibility differences that must be verified before selection.

Selection should prioritize Littelfuse parametric equivalents for applications requiring exact 250 V AC operation and standard 3AB/3AG holder compatibility. The SCHURTER 8020.5019 is appropriate only when system voltage tolerance permits 500 V operation.

Frequently Asked Questions (FAQ)

Q: Can the SCHURTER 8020.5019 be used as a direct replacement for the SCHURTER 0034.3425?

A: No. While both are 6.3 A slow-blow fuses from SCHURTER, the 8020.5019 operates at 500 V AC (versus 250 V AC), uses ceramic construction (versus glass), and has a non-standard package designation. Use only if your application voltage tolerance permits 500 V operation and holder compatibility is verified.

Q: Are the Littelfuse 031306.3HXP, 031306.3MXP, and 031306.3VXP interchangeable?

A: Yes. These three Littelfuse parts are parametric equivalents with identical electrical ratings (6.3 A, 250 V AC), fuse type (glass cartridge), response time (slow blow), mechanical dimensions (0.250" Dia x 1.250" L), and holder compatibility (3AB, 3AG). Selection between them may be based on availability or specific certification requirements.

Q: What certifications should I verify for my application?

A: The Littelfuse equivalents carry CE, CSA, UL, PSE, and K-MARK/KC certifications. Verify that the selected part meets your regional and application-specific certification requirements before procurement.

Q: Will the substitute parts fit in my existing fuse holder?

A: The Littelfuse 031306.3HXP, 031306.3MXP, and 031306.3VXP maintain the standard 3AB and 3AG package designation with identical dimensions (0.250" Dia x 1.250" L). They are mechanically compatible with holders designed for the original SCHURTER 0034.3425. The SCHURTER 8020.5019 has a non-standard package designation and requires holder compatibility verification.

Q: What is the difference between the melting I²t values?

A: The original SCHURTER 0034.3425 has a melting I²t of 300, while the Littelfuse equivalents have 242. The SCHURTER 8020.5019 has 225. These values indicate thermal energy required for fuse element melting. Verify that the selected part's I²t rating is appropriate for your circuit protection requirements.

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