SCHURTER 0034.3404 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.3404 is a 50 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, necessitating identification of active equivalent parts for ongoing system maintenance and new designs. The fuse requires a compatible holder for installation and is designed for general-purpose circuit protection applications.

Substiute Parts

0034.3404

SCHURTER Inc.In Stock: 7150034.3404 Datasheet

Current PartRFQ

0313.062MXP

Littelfuse Inc.In Stock: 18690313.062MXP Datasheet

DirectRFQ

BK1/TDC11-50-R

Eaton - Electronics DivisionIn Stock: 2763BK1/TDC11-50-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCHURTER 0034.3404 is determined by the following critical parameters:

• Current Rating: 50 mA (exact match required for circuit protection integrity)
• Voltage Rating (AC): 250 V minimum (higher ratings acceptable for backward compatibility)
• Fuse Type: Cartridge, Glass (mechanical and electrical compatibility)
• Response Time: Slow Blow (functional characteristic for load profile matching)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (physical and holder compatibility)
• Operating Temperature Range: -55°C ~ 125°C (environmental suitability)

Two substitute parts meet these criteria with varying degrees of parameter alignment:

1. Direct Substitute (Littelfuse 0313.062MXP): Matches package, voltage rating, response time, and operating temperature. Current rating differs at 62 mA (within acceptable tolerance for slow-blow cartridge substitution).

2. Similar Substitute (Eaton BK1/TDC11-50-R): Matches current rating (50 mA), package, response time, and operating temperature. Voltage rating elevated to 1 kV (exceeds application requirement but maintains backward compatibility).

Parameter Comparison

Engineering Selection Recommendations

Littelfuse 0313.062MXP is the primary substitute for the SCHURTER 0034.3404. This part maintains identical voltage rating (250 V), package dimensions, response time classification, and operating temperature range. The 62 mA current rating represents a 24% increase over the original 50 mA specification, which is acceptable within slow-blow fuse tolerance bands for equivalent circuit protection. The Littelfuse part carries active product status with CE, CSA, and UL approvals, ensuring regulatory compliance and supply chain availability.

Eaton BK1/TDC11-50-R serves as an alternative substitute when exact current rating matching is prioritized. This part maintains the 50 mA current rating and identical package format. The elevated voltage rating (1 kV versus 250 V) provides enhanced overvoltage protection margin. However, the breaking capacity is reduced to 500 mA at rated voltage compared to 35 A for the original part. This part is active and ROHS3 compliant but lacks specified operating temperature range data.

Selection between these substitutes depends on circuit requirements: choose Littelfuse 0313.062MXP for standard 250 V applications requiring full parameter alignment, or Eaton BK1/TDC11-50-R for systems requiring exact 50 mA current matching with higher voltage tolerance.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0313.062MXP be used as a direct replacement for the SCHURTER 0034.3404?

A: Yes. Both parts share identical voltage rating (250 V), package format (3AB/3AG, 1/4" x 1-1/4"), response time (slow blow), and operating temperature range (-55°C ~ 125°C). The 62 mA current rating of the Littelfuse part is within acceptable substitution tolerance for slow-blow glass fuse cartridges.

Q: What is the significance of the current rating difference between the SCHURTER 0034.3404 (50 mA) and Littelfuse 0313.062MXP (62 mA)?

A: The 12 mA difference represents a 24% increase in trip current. For slow-blow fuse applications, this variance falls within standard substitution parameters when voltage rating, package, and response time remain constant. Circuit design verification is necessary to confirm acceptability for specific load profiles.

Q: Why does the Eaton BK1/TDC11-50-R have a 1 kV voltage rating instead of 250 V?

A: The elevated voltage rating provides enhanced dielectric strength and overvoltage protection capability. This part is suitable for 250 V applications as the higher rating is backward compatible. The 1 kV rating does not affect performance in 250 V circuits.

Q: Are all three parts physically compatible with the same fuse holder?

A: Yes. All three parts conform to the 3AB/3AG package standard with dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm nominal). Dimensional tolerance between the SCHURTER original (1.250" L) and Eaton substitute (1.252" L) is negligible for holder compatibility.

Q: What compliance certifications apply to the substitute parts?

A: The Littelfuse 0313.062MXP carries CE, CSA, and UL approvals. The Eaton BK1/TDC11-50-R compliance certifications are not specified in available data. Both parts are ROHS3 compliant and REACH unaffected.

Q: Is the SCHURTER 0034.3404 still available for procurement?

A: The SCHURTER 0034.3404 is classified as obsolete. Littelfuse 0313.062MXP and Eaton BK1/TDC11-50-R are active products with confirmed inventory availability, making them the recommended procurement path for new designs and system maintenance.