SCHURTER 0034.3422 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.3422 is a 3.15 A, 250 V AC/DC slow-blow glass fuse cartridge in 3AB/3AG package format (1/4" x 1-1/4"). This component is classified as obsolete, making substitute parts necessary for ongoing system maintenance and new designs. The fuse requires a compatible holder for installation and is designed for general-purpose circuit protection applications requiring slow-blow response characteristics.

Key Parameters

Parameter	Value
Manufacturer Part Number	0034.3422
Manufacturer	SCHURTER Inc.
Current Rating	3.15 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
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the SCHURTER 0034.3422 is determined by the following critical parameters:

Primary Substitution Criteria:

Current Rating: 3.15 A (tolerance range 3.15 A to 3.2 A acceptable)
Voltage Rating: 250 V AC minimum
Response Time: Slow Blow
Package Format: 3AB/3AG cartridge, 1/4" x 1-1/4" dimensions
Mounting Type: Requires Holder

Secondary Compatibility Factors:

Fuse Type: Glass or ceramic cartridge construction
Operating Temperature: Minimum -55°C ~ 125°C range
RoHS Compliance: ROHS3 Compliant
Approval Agencies: CE certification required

Two substitute parts meet these criteria with varying trade-offs in voltage rating, fuse material, and breaking capacity.

Parameter Comparison

Parameter	0034.3422 (Main)	8020.5016 (Substitute)	031303.2MXP (Substitute)
Manufacturer	SCHURTER Inc.	SCHURTER Inc.	Littelfuse Inc.
Current Rating (A)	3.15	3.15	3.2
Voltage Rating (AC)	250 V	500 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Ceramic	Cartridge, Glass
Response Time	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"
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)
Operating Temperature	-55°C ~ 125°C	-40°C ~ 85°C	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	35 A	1.5 kA	100 A
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CE	cURus	CE, CSA, K-MARK, PSE, UL

Engineering Selection Recommendations

Littelfuse 031303.2MXP is the primary substitute for the SCHURTER 0034.3422. This part maintains identical voltage rating (250 V AC), package format (3AB/3AG, 1/4" x 1-1/4"), fuse type (glass cartridge), and operating temperature range (-55°C ~ 125°C). Current rating is 3.2 A, within acceptable tolerance of the original 3.15 A specification. The part holds active product status with comprehensive approval certifications (CE, CSA, K-MARK, PSE, UL), ensuring regulatory compliance across multiple markets.

SCHURTER 8020.5016 serves as an alternative substitute when higher voltage rating (500 V AC) is required. This ceramic cartridge fuse maintains the same current rating (3.15 A) and slow-blow response. However, the package format is listed as non-standard, and the operating temperature range is reduced (-40°C ~ 85°C). This substitute is suitable only when system voltage requirements exceed 250 V and holder compatibility can be confirmed.

Selection between substitutes depends on system voltage requirements and operating environment temperature specifications. For standard 250 V applications within the -55°C ~ 125°C range, the Littelfuse part is the direct equivalent. For higher voltage systems, the SCHURTER ceramic option provides enhanced voltage capability with trade-offs in temperature range and package standardization.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 031303.2MXP directly replace the SCHURTER 0034.3422 without holder modification?

A: Yes. Both parts use the identical 3AB/3AG package format with 1/4" x 1-1/4" dimensions (6.35mm x 31.75mm). The Littelfuse part is mechanically and electrically compatible with existing holders designed for the original SCHURTER fuse.

Q: What is the significance of the 3.2 A rating on the Littelfuse part versus the 3.15 A original?

A: The 3.2 A rating represents a 1.6% increase in current capacity. This falls within standard tolerance ranges for fuse specifications and does not compromise circuit protection. The part remains suitable for protecting 3.15 A circuits.

Q: Why is the SCHURTER 8020.5016 listed as a substitute if it has a non-standard package?

A: The 8020.5016 is included as a substitute option for applications requiring 500 V AC voltage rating. The non-standard package designation indicates dimensional or holder compatibility differences that must be verified before implementation. This part is suitable only when voltage requirements exceed 250 V and holder compatibility is confirmed.

Q: What is the difference between glass and ceramic fuse cartridges in these substitutes?

A: Glass cartridges (0034.3422 and 031303.2MXP) provide visibility of the fuse element and are standard for general-purpose applications. Ceramic cartridges (8020.5016) offer higher breaking capacity (1.5 kA versus 35 A or 100 A) and are used in applications requiring enhanced fault current handling. Material selection depends on system fault current levels and application requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both substitute parts (8020.5016 and 031303.2MXP) are ROHS3 compliant, matching the compliance status of the original SCHURTER 0034.3422.

Q: Which substitute has the broadest regulatory approval?

A: The Littelfuse 031303.2MXP holds the most comprehensive certifications: CE, CSA, K-MARK, PSE, and UL. This makes it suitable for applications requiring multi-market regulatory compliance. The SCHURTER 8020.5016 holds cURus certification, which covers North American markets.

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