SCHURTER 0034.5138 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.5138 is a 4 A 250 V AC DC fast-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. Glass fuse cartridges in this specification are widely used in industrial control circuits, power distribution, and equipment protection applications where fast-response overcurrent protection is required.

Substiute Parts

0034.5138

SCHURTER Inc.In Stock: 8700034.5138 Datasheet

Current PartRFQ

8020.5074

SCHURTER Inc.In Stock: 63608020.5074 Datasheet

SimilarRFQ

0312004.VXP

Littelfuse Inc.In Stock: 11210312004.VXP Datasheet

DirectRFQ

0312004.HXP

Littelfuse Inc.In Stock: 38230312004.HXP Datasheet

SimilarRFQ

0312004.MXP

Littelfuse Inc.In Stock: 21100312004.MXP Datasheet

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3AG 4-R

Bel Fuse Inc.In Stock: 19473AG 4-R Datasheet

Parametric EquivalentRFQ

FSA-4A

OptiFuseIn Stock: 5876FSA-4A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCHURTER 0034.5138 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 4 A
• Voltage Rating (AC): 250 V
• Fuse Type: Cartridge, Glass
• Response Time: Fast Blow
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4"
• Mounting Type: Requires Holder

Compatible Substitute Categories:

1. Direct Manufacturer Equivalents – Active parts from Littelfuse Inc. (0312004.VXP, 0312004.HXP, 0312004.MXP) that match all mandatory parameters with identical electrical and mechanical specifications.

2. Parametric Equivalents – Active parts from alternative manufacturers (Bel Fuse Inc. 3AG 4-R, OptiFuse FSA-4A) that meet all mandatory parameters and maintain functional compatibility within the 3AB/3AG holder system.

3. Higher Voltage Alternative – SCHURTER 8020.5074 (ceramic, 500 V AC) shares identical current rating, package, and mounting but operates at elevated voltage with different fuse material characteristics.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

The Littelfuse 312 series parts (0312004.VXP, 0312004.HXP, 0312004.MXP) are direct functional equivalents to the SCHURTER 0034.5138. All three variants maintain identical electrical ratings (4 A, 250 V AC), glass construction, fast-blow response, and 3AB/3AG package compatibility. These parts carry active product status and expanded regulatory approvals (CE, CSA, KC, PSE, UL) compared to the obsolete SCHURTER original. Selection among the three Littelfuse variants depends on internal construction differences (VXP, HXP, MXP designations) that do not affect external electrical or mechanical performance.

Secondary Substitutes (Parametric Equivalents):

The Bel Fuse 3AG 4-R and OptiFuse FSA-4A maintain all mandatory electrical and mechanical parameters. Both are active products with appropriate regulatory certifications (CSA, cULus, PSE for Bel Fuse; cULus, UL 248 for OptiFuse). These alternatives are suitable for applications where manufacturer diversity is required or where specific inventory availability is a consideration.

Alternative Voltage Option:

The SCHURTER 8020.5074 (ceramic, 500 V AC) is applicable only in circuits where the higher voltage rating provides system-level benefits and where ceramic fuse characteristics are acceptable. This part is not a direct substitute but rather an alternative for upgraded protection specifications.

Frequently Asked Questions (FAQ)

Q: Can I use the Littelfuse 0312004.VXP as a direct replacement for the SCHURTER 0034.5138?

A: Yes. Both parts are 4 A, 250 V AC fast-blow glass fuses in 3AB/3AG package format with identical mechanical dimensions and mounting requirements. The Littelfuse part is active and carries broader regulatory approvals.

Q: What is the difference between the three Littelfuse variants (VXP, HXP, MXP)?

A: The VXP, HXP, and MXP designations indicate internal construction or material variations within the Littelfuse 312 series. All three maintain identical external electrical and mechanical specifications for the 4 A, 250 V AC rating and are interchangeable in the 3AB/3AG holder.

Q: Why does the SCHURTER 8020.5074 have a higher breaking capacity (1.5kA vs 200A)?

A: The 8020.5074 uses ceramic construction instead of glass, which provides higher breaking capacity. This part operates at 500 V AC, making it suitable for different circuit protection requirements. It is not a direct substitute but an alternative for upgraded voltage specifications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts (Littelfuse 0312004 series, Bel Fuse 3AG 4-R, OptiFuse FSA-4A, and SCHURTER 8020.5074) are ROHS3 compliant.

Q: What regulatory certifications should I verify for my application?

A: The original SCHURTER 0034.5138 carries CSA and UL approvals. The Littelfuse 312 series parts expand this to CE, CSA, KC, PSE, and UL. Bel Fuse and OptiFuse alternatives carry cULus and PSE certifications. Verify that the selected substitute meets the specific regulatory requirements of your end application and geographic market.

Q: Can I mix different substitute manufacturers in the same system?

A: Yes, provided all selected parts meet the mandatory electrical parameters (4 A, 250 V AC, fast-blow, 3AB/3AG package) and the circuit design does not require manufacturer-specific performance characteristics. Verify that all parts carry appropriate regulatory approvals for your application.

Q: What is the operating temperature range difference between substitutes?

A: The SCHURTER 0034.5138, Littelfuse 312 series, Bel Fuse 3AG 4-R, and OptiFuse FSA-4A all operate from -55°C to 125°C. The SCHURTER 8020.5074 (ceramic) operates from -40°C to 85°C, a narrower range. Select based on your circuit's thermal environment requirements.