SCHURTER 0034.3421 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.3421 is a 2.5 A 250 V AC DC glass cartridge fuse with slow-blow response characteristics, designed for 3AB and 3AG holder applications. This component is classified as obsolete, necessitating identification of active equivalent alternatives to maintain circuit protection functionality in existing designs and new production applications.

Key Parameters

Parameter	Value
Current Rating	2.5 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)
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the SCHURTER 0034.3421 is determined by strict alignment of the following parameters:

Current Rating: 2.5 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 (6.35mm x 31.75mm) (exact match required)

Three Littelfuse Inc. part numbers meet these criteria: 031302.5HXP, 031302.5MXP, and 031302.5VXP. All three are active products from the 313 series with identical electrical and mechanical specifications to the obsolete SCHURTER component.

The SCHURTER 8020.5015 ceramic fuse variant does not qualify as a direct substitute due to differing fuse material (ceramic vs. glass) and voltage rating (500 V vs. 250 V).

Parameter Comparison

Parameter	SCHURTER 0034.3421	Littelfuse 031302.5HXP	Littelfuse 031302.5MXP	Littelfuse 031302.5VXP
Manufacturer	SCHURTER Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	2.5 A	2.5 A	2.5 A	2.5 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"	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 1.250" 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)
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	35 A	100 A	100 A	100 A
Melting I²t	48	130	130	130
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA	CE, CSA, K-MARK, PSE, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, KC, PSE, UL

Engineering Selection Recommendations

All three Littelfuse 313 series alternatives (031302.5HXP, 031302.5MXP, 031302.5VXP) are direct parametric equivalents to the obsolete SCHURTER 0034.3421. Selection among these three active products should be based on:

Product Availability: Littelfuse 031302.5MXP offers the highest inventory level (9,244 pcs), followed by 031302.5HXP (1,241 pcs) and 031302.5VXP (869 pcs).

Regulatory Compliance: All three Littelfuse variants maintain ROHS3 compliance and expand approval agency coverage beyond the original SCHURTER component. Littelfuse 031302.5HXP and 031302.5MXP include K-MARK and PSE certifications. Littelfuse 031302.5VXP includes KC certification in place of K-MARK.

Performance Characteristics: The Littelfuse alternatives provide enhanced breaking capacity (100 A vs. 35 A) and higher melting I²t values (130 vs. 48), representing improved fault protection margins within the same electrical and mechanical envelope.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 031302.5HXP, 031302.5MXP, or 031302.5VXP be used as direct replacements for the SCHURTER 0034.3421?

A: Yes. All three Littelfuse variants are parametric equivalents with identical current rating (2.5 A), voltage rating (250 V AC), fuse type (cartridge, glass), response time (slow blow), package designation (3AB, 3AG), and physical dimensions (0.250" Dia x 1.250" L). They are mechanically and electrically compatible with existing 3AB and 3AG holder applications.

Q: Why are the Littelfuse alternatives rated for higher breaking capacity and melting I²t?

A: The Littelfuse 313 series components incorporate enhanced internal construction while maintaining identical external dimensions and electrical ratings. These improvements provide greater fault protection margins and are not detrimental to circuit operation.

Q: Are there differences in regulatory approvals between the three Littelfuse options?

A: Minor differences exist. Littelfuse 031302.5HXP and 031302.5MXP carry identical certifications (CE, CSA, K-MARK, PSE, UL). Littelfuse 031302.5VXP includes KC certification instead of K-MARK. All three maintain CSA and UL approvals required for North American applications.

Q: What is the difference between the SCHURTER 8020.5015 and the recommended substitutes?

A: The SCHURTER 8020.5015 is not a direct substitute. It is a ceramic fuse rated for 500 V AC, whereas the original component and recommended alternatives are glass fuses rated for 250 V AC. Ceramic and glass fuses have different thermal and electrical characteristics and are not interchangeable.

Q: Which Littelfuse part should be selected if inventory is a primary concern?

A: Littelfuse 031302.5MXP is recommended based on highest available inventory (9,244 pcs). All three variants are functionally equivalent, so selection can be based on supply chain availability.

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