SCHURTER 0034.4276 Board Mount Fuse 500mA 125VAC/VDC Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.4276 is a 500 mA, 125 V AC/DC board mount fuse with fast blow response time, designed for through-hole radial mounting in the MSF 125 series. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The fuse is ROHS3 compliant and rated for operating temperatures from -25°C to 85°C with a breaking capacity of 300A at rated voltage.

Substiute Parts

0034.4276

SCHURTER Inc.In Stock: 7010034.4276 Datasheet

Current PartRFQ

0034.4216

SCHURTER Inc.In Stock: 11670034.4216 Datasheet

Parametric EquivalentRFQ

0034.4246

SCHURTER Inc.In Stock: 9960034.4246 Datasheet

Parametric EquivalentRFQ

0273.500H

Littelfuse Inc.In Stock: 15700273.500H Datasheet

DirectRFQ

0272.500H

LittelfuseIn Stock: 11420272.500H Datasheet

SimilarRFQ

0272.500V

Littelfuse Inc.In Stock: 8220272.500V Datasheet

SimilarRFQ

0278.500V

Littelfuse Inc.In Stock: 7910278.500V Datasheet

SimilarRFQ

0279.500V

Littelfuse Inc.In Stock: 9030279.500V Datasheet

SimilarRFQ

30305000421

Littelfuse Inc.In Stock: 111930305000421 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCHURTER 0034.4276 is determined by strict equivalence across the following critical parameters: current rating (500 mA), AC voltage rating (125 V), DC voltage rating (125 V), response time (fast blow), mounting type (through hole), and fuse type (board mount, cartridge style excluded). Parts are grouped into three categories based on their relationship to the main part:

Parametric Equivalents (SCHURTER 0034.4216 and 0034.4246): These parts maintain identical electrical specifications and mounting characteristics but differ in breaking capacity and product status. Both are active production parts with bulk packaging.

Direct Manufacturer Equivalent (Littelfuse 0274.600H): Meets all critical electrical and mechanical parameters with enhanced breaking capacity (10kA) and extended temperature range (-55°C to 85°C).

Similar Alternatives (Littelfuse 0272.500H, 0272.500V, 0278.500V, 0279.500V): These parts satisfy the core electrical requirements and mounting specifications. Littelfuse 0272.500H and 0272.500V offer extended operating temperature to 125°C. Littelfuse 0278.500V and 0279.500V provide 10kA breaking capacity with standard temperature ranges.

Limited Compatibility (Littelfuse 30305000421): This part maintains 500 mA current rating and 125 V AC voltage but has reduced DC voltage rating (63 V instead of 125 V), making it suitable only for applications where DC voltage does not exceed 63 V.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete SCHURTER 0034.4276, the SCHURTER 0034.4216 and 0034.4246 provide parametric equivalence with active product status and maintained electrical specifications. Both parts are ROHS3 compliant and carry cURus approval consistent with the original part.

For enhanced performance characteristics, Littelfuse MICRO™ series parts (0274.600H, 0272.500H, 0272.500V, 0278.500V, 0279.500V) offer 10kA breaking capacity compared to the original 300A, with CSA, QPL, and UL certifications. These parts maintain identical current and voltage ratings with fast blow response. The Littelfuse 0272.500H and 0272.500V extend the upper operating temperature limit to 125°C, suitable for applications requiring enhanced thermal performance.

The Littelfuse 30305000421 (TR3® 303 series) is suitable only for applications where the DC voltage requirement does not exceed 63 V, as it carries a reduced DC voltage rating. This part is not recommended as a general substitute for the original 125 V DC specification.

All substitute parts listed are ROHS3 compliant and REACH unaffected, maintaining regulatory compliance with the original part.

Frequently Asked Questions (FAQ)

Q: Can SCHURTER 0034.4216 or 0034.4246 be used as direct replacements for the obsolete 0034.4276?

A: Yes. Both parts maintain identical electrical specifications (500 mA, 125 V AC/DC, fast blow response) and through-hole radial mounting. The primary difference is reduced breaking capacity (100A versus 300A), which is acceptable for most applications. Both are active production parts with ROHS3 compliance and cURus approval.

Q: What are the advantages of Littelfuse MICRO™ series substitutes?

A: Littelfuse parts offer significantly higher breaking capacity (10kA versus 300A or 100A), providing enhanced protection in high-fault-current environments. They carry UL, CSA, and QPL certifications. The 0272.500H and 0272.500V extend the upper operating temperature to 125°C. All Littelfuse alternatives maintain the 500 mA current rating and 125 V AC/DC voltage specifications.

Q: Are there physical size differences between the main part and substitutes?

A: Yes. The original SCHURTER 0034.4276 measures 0.252" diameter × 0.346" height (6.40mm × 8.80mm). Littelfuse MICRO™ 272, 278, and 279 series parts measure 0.235" diameter × 0.287" height (5.97mm × 7.30mm) or 0.250" diameter × 0.350" height (6.35mm × 8.89mm). Physical dimensions must be verified against PCB layout and mechanical constraints before selection.

Q: When should the Littelfuse 30305000421 (TR3® 303) be considered?

A: This part is suitable only for applications where DC voltage does not exceed 63 V. It is not recommended as a general substitute for the 125 V DC specification of the original part. Verify DC voltage requirements before selection.

Q: What certifications apply to all substitute parts?

A: All listed substitutes are ROHS3 compliant and REACH unaffected. SCHURTER parts carry cURus approval. Littelfuse parts carry UL, CSA, and QPL certifications, providing broader regulatory coverage for industrial and safety-critical applications.