SCHURTER 0034.4271 Board Mount Fuse — Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.4271 is a 160 mA, 125 V AC/DC board mount fuse with fast-blow response characteristics, designed for through-hole radial mounting in radial can package format. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The MSF 125 series fuse provides protection in low-voltage AC and DC circuits with a breaking capacity of 300 A at rated voltage.

Substiute Parts

0034.4271

SCHURTER Inc.In Stock: 10430034.4271 Datasheet

Current PartRFQ

0034.4211

SCHURTER Inc.In Stock: 7460034.4211 Datasheet

DirectRFQ

0034.4241

SCHURTER Inc.In Stock: 8220034.4241 Datasheet

Parametric EquivalentRFQ

30301600421

LittelfuseIn Stock: 88130301600421 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0034.4271 are classified into two categories based on electrical and mechanical parameter alignment:

Direct Manufacturer Equivalents (SCHURTER 0034.4211, 0034.4241): These parts maintain identical electrical specifications—160 mA current rating, 125 V AC/DC voltage ratings, fast-blow response, and matching thermal characteristics (0.0036 melting I²t). Both are active products with through-hole radial can mounting and identical physical dimensions (0.252" Dia x 0.346" H). The primary difference is breaking capacity: 0034.4211 and 0034.4241 are rated at 100 A versus the original 300 A. These substitutes are suitable for applications where the lower breaking capacity meets circuit protection requirements.

Cross-Manufacturer Parametric Equivalent (Littelfuse 30301600421): This part matches the 160 mA current rating, 125 V AC voltage rating, fast-blow response, and through-hole radial can mounting. However, it differs in DC voltage rating (63 V versus 125 V), physical dimensions (0.236" Dia x 0.315" H versus 0.252" Dia x 0.346" H), breaking capacity (50 A versus 300 A), melting I²t (0.0029 versus 0.0036), and operating temperature range (-25°C ~ 70°C versus -25°C ~ 85°C). This part is suitable only for applications operating at 63 V DC or lower.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): SCHURTER 0034.4211 or 0034.4241 are the primary substitutes. Both maintain identical electrical performance at 160 mA, 125 V AC/DC with fast-blow response and matching thermal characteristics. These parts are active products with cURus approval and ROHS3 compliance, ensuring regulatory continuity. The reduced breaking capacity (100 A) is acceptable for most low-voltage circuit protection applications where the original 300 A rating exceeds system requirements. Physical dimensions and mounting footprint are identical, requiring no PCB redesign.

For Voltage-Constrained Applications: Littelfuse 30301600421 is suitable only when circuit operation is limited to 63 V DC maximum. This part introduces dimensional changes (0.236" Dia x 0.315" H), reduced breaking capacity (50 A), and a narrower operating temperature range (-25°C ~ 70°C). PCB layout verification is required due to size differences. This part carries CSA and UL approvals, providing alternative certification pathways.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and REACH unaffected status. The SCHURTER substitutes preserve cURus certification, while the Littelfuse alternative provides CSA and UL certifications. Selection should align with circuit protection standards and approval requirements for the target application.

Frequently Asked Questions (FAQ)

Q: Can SCHURTER 0034.4211 or 0034.4241 be used as direct replacements for the obsolete 0034.4271?

A: Yes. Both parts are electrically and mechanically compatible. They maintain the same 160 mA current rating, 125 V AC/DC voltage ratings, fast-blow response, and physical dimensions (0.252" Dia x 0.346" H). The breaking capacity reduction from 300 A to 100 A is acceptable for applications where circuit fault currents do not exceed 100 A. No PCB modifications are required.

Q: What is the significance of the breaking capacity difference between the main part (300 A) and the SCHURTER substitutes (100 A)?

A: Breaking capacity defines the maximum fault current the fuse can safely interrupt without rupturing or creating a hazard. The 0034.4211 and 0034.4241 are rated for 100 A breaking capacity, suitable for circuits with fault currents up to 100 A. If your circuit design includes fault currents exceeding 100 A, these substitutes are not appropriate. Verify circuit protection requirements before selection.

Q: Is the Littelfuse 30301600421 a suitable substitute for all applications?

A: No. The Littelfuse part is limited to applications operating at 63 V DC or lower. The original 0034.4271 supports 125 V DC operation. Additionally, the Littelfuse part has different physical dimensions (0.236" Dia x 0.315" H), requiring PCB layout verification. The operating temperature range is also narrower (-25°C ~ 70°C versus -25°C ~ 85°C). Use this part only when DC voltage requirements do not exceed 63 V.

Q: Are there packaging differences between the substitute parts?

A: The SCHURTER 0034.4211 and 0034.4241 are supplied in bulk packaging, matching the original part's packaging format. The Littelfuse 30301600421 is also bulk packaged. All three parts use identical through-hole radial can mounting, with the Littelfuse variant supporting vertical orientation. No special handling or assembly modifications are required.

Q: What certifications do the substitute parts carry?

A: SCHURTER 0034.4211 and 0034.4241 carry cURus approval, matching the original part's certification. Littelfuse 30301600421 carries CSA and UL approvals. All parts are ROHS3 compliant and REACH unaffected. Select based on your circuit's regulatory and approval requirements.