SCHURTER 0034.3413 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.3413 is a 400 mA, 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, requiring identification of active equivalent alternatives for continued system support and procurement.

Key Parameters

Parameter	Value
Current Rating	400 mA
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-55°C ~ 125°C
Size / Dimension	0.250" Dia x 1.250" L (6.35mm x 31.75mm)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

Current Rating: 400 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Type: Requires Holder (exact match required)

All substitute parts listed meet these core electrical and mechanical parameters. Variations in breaking capacity, melting I²t, approval agencies, and RoHS compliance are noted but do not disqualify substitution eligibility based on functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage (AC)	Response Time	Package	Breaking Capacity @ Rated Voltage	Operating Temperature	Product Status	RoHS Status
0034.3413	SCHURTER Inc.	400 mA	250 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	35A	-55°C ~ 125°C	Obsolete	ROHS3 Compliant
0034.5218	SCHURTER Inc.	400 mA	250 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	35A	-55°C ~ 125°C	Obsolete	ROHS3 Compliant
0313.400MXP	Littelfuse Inc.	400 mA	250 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	35A	-55°C ~ 125°C	Active	ROHS3 Compliant
TSA-400MA	OptiFuse	400 mA	250 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	100A	-55°C ~ 125°C	Active	ROHS3 Compliant
BK/MDQ-4/10	Eaton - Electronics Division	400 mA	250 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	Not Specified	Not Specified	Active	RoHS non-compliant
MDQ-4/10	Eaton - Electronics Division	400 mA	250 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	35A	Not Specified	Active	ROHS3 Compliant
0313.400HXP	Littelfuse Inc.	400 mA	250 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	35A	-55°C ~ 125°C	Active	ROHS3 Compliant
0313.400VXP	Littelfuse Inc.	400 mA	250 V	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	35A	-55°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete SCHURTER 0034.3413, the following selection criteria apply:

Primary Recommendation: Littelfuse 0313.400MXP, 0313.400HXP, or 0313.400VXP. These parts are active products with full compliance certifications (CE, CSA, UL), ROHS3 compliance, and identical electrical and mechanical specifications including 35A breaking capacity and -55°C to 125°C operating temperature range.

Secondary Recommendation: OptiFuse TSA-400MA. This part is active with cULus and UL 248 certifications, ROHS3 compliance, and identical core electrical parameters. Breaking capacity is 100A, exceeding the original 35A specification. Dimensional tolerance is 0.002" greater in length (1.252" vs 1.250").

Alternative Consideration: Eaton MDQ-4/10. This part is active with CSA and UL certifications and ROHS3 compliance. Breaking capacity matches the original 35A specification. Operating temperature range is not specified in available data.

Not Recommended for New Designs: Eaton BK/MDQ-4/10 is RoHS non-compliant and lacks specified operating temperature and breaking capacity data.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0313.400MXP directly replace the SCHURTER 0034.3413?

A: Yes. Both parts share identical current rating (400 mA), voltage rating (250 V AC), response time (slow blow), package format (3AB, 3AG, 1/4" x 1-1/4"), breaking capacity (35A), and operating temperature range (-55°C to 125°C). Both are ROHS3 compliant.

Q: What is the difference between the Littelfuse 0313.400MXP, 0313.400HXP, and 0313.400VXP?

A: All three Littelfuse parts are parametrically equivalent with identical electrical and mechanical specifications. Differences exist only in internal design variants (indicated by the suffix letters M, H, V) and are not relevant to substitution compatibility.

Q: Why does the OptiFuse TSA-400MA have a higher breaking capacity (100A vs 35A)?

A: Breaking capacity is a measure of the maximum current the fuse can safely interrupt. The TSA-400MA's higher breaking capacity does not affect its suitability as a substitute, as it exceeds the original specification. The fuse will still operate at 400 mA with identical response characteristics.

Q: Is the 0.002" dimensional difference in the OptiFuse TSA-400MA significant?

A: The TSA-400MA measures 1.252" in length versus 1.250" for the original part. This 0.002" difference is within typical mechanical tolerance for cartridge fuse holders and does not affect functional compatibility.

Q: Why is the Eaton BK/MDQ-4/10 not recommended?

A: The BK/MDQ-4/10 is RoHS non-compliant and lacks specified operating temperature and breaking capacity data. For applications requiring regulatory compliance or full technical documentation, the Littelfuse or OptiFuse alternatives are preferred.

Q: Can I use the SCHURTER 0034.5218 as a substitute?

A: The 0034.5218 is parametrically equivalent to the 0034.3413 but is also classified as obsolete. It is not suitable for long-term procurement strategies. Active alternatives such as the Littelfuse 0313.400MXP are recommended instead.

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