SCHURTER 0034.4286 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.4286 is a 3.15 A, 125 V AC/DC board mount fuse with fast blow response time, designed for through-hole radial mounting in can package format. This part is classified as obsolete, making identification of equivalent and substitute components necessary for ongoing design support and procurement planning. Substitute parts must maintain electrical compatibility across current rating, voltage specifications, and mechanical mounting characteristics.

Substiute Parts

0034.4286

SCHURTER Inc.In Stock: 7900034.4286 Datasheet

Current PartRFQ

0034.4226

SCHURTER Inc.In Stock: 15200034.4226 Datasheet

SimilarRFQ

0034.4256

SCHURTER Inc.In Stock: 11250034.4256 Datasheet

Parametric EquivalentRFQ

30313150421

Littelfuse Inc.In Stock: 135330313150421 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SCHURTER 0034.4286 are grouped based on strict electrical and mechanical parameter alignment:

Group 1: Direct Electrical Equivalents (SCHURTER Series)

• Parts 0034.4226 and 0034.4256 maintain identical electrical specifications: 3.15 A current rating, 125 V AC/DC voltage rating, fast blow response, and through-hole radial can mounting. These parts are active products from the same manufacturer and series (MSF 125), differing only in breaking capacity and melting I²t values, which remain within acceptable substitution parameters for this fuse category.

Group 2: Parametric Equivalent (Cross-Manufacturer)

• Part 30313150421 (Littelfuse TR3® 303 series) matches the 3.15 A current rating and 125 V AC voltage rating. However, this part specifies 63 V DC rating versus the 125 V DC of the main part, representing a reduced DC voltage capability. Mechanical dimensions differ slightly (0.236" Dia x 0.315" H versus 0.252" Dia x 0.346" H), and breaking capacity is lower at 50 A. This part is suitable only where DC voltage requirements do not exceed 63 V.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): Parts 0034.4226 and 0034.4256 are recommended as primary substitutes. Both are active products from SCHURTER's MSF 125 series with identical electrical ratings and mechanical dimensions. The reduction in breaking capacity (100 A versus 300 A) and melting I²t (1.1 versus 1.11) does not affect substitution validity for standard board mount fuse applications. Both parts carry ROHS3 compliance and cURus approval, matching the regulatory status of the main part.

For Constrained DC Voltage Applications: Part 30313150421 (Littelfuse) is suitable only where circuit design limits DC voltage to 63 V or below. The reduced breaking capacity (50 A) and lower melting I²t (0.45) indicate different thermal and electrical characteristics. Mechanical dimensions are slightly smaller, which may require PCB layout verification. Operating temperature range is reduced to -25°C ~ 70°C. CSA and UL approvals differ from the cURus certification of the main part.

Inventory Availability: Active substitute parts 0034.4226 (1507 pcs) and 0034.4256 (1088 pcs) offer superior availability compared to the obsolete main part (708 pcs).

Frequently Asked Questions (FAQ)

Q: Can 0034.4226 or 0034.4256 be used as direct replacements for 0034.4286? A: Yes. Both parts maintain identical current rating (3.15 A), voltage ratings (125 V AC/DC), response time (fast blow), mounting type (through hole), and package dimensions (0.252" Dia x 0.346" H). They are electrically and mechanically compatible.

Q: What is the significance of the breaking capacity difference between the main part (300 A) and substitutes 0034.4226/0034.4256 (100 A)? A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. The reduction from 300 A to 100 A does not affect normal operation in applications where fault currents remain below 100 A. Circuit design review is necessary only if fault current analysis exceeds 100 A.

Q: Can the Littelfuse 30313150421 be used in all applications requiring the 0034.4286? A: No. The Littelfuse part is limited to applications where DC voltage does not exceed 63 V. The main part and SCHURTER substitutes support 125 V DC. Additionally, the reduced breaking capacity (50 A) and melting I²t (0.45) indicate different thermal response characteristics.

Q: Are there mechanical compatibility concerns with the Littelfuse 30313150421? A: Yes. The Littelfuse part has slightly smaller dimensions (0.236" Dia x 0.315" H versus 0.252" Dia x 0.346" H). PCB footprint and mounting hole spacing must be verified before substitution.

Q: Do all substitute parts meet the same regulatory compliance as the main part? A: SCHURTER parts 0034.4226 and 0034.4256 maintain identical ROHS3 compliance and cURus approval. The Littelfuse part carries CSA and UL approvals instead of cURus certification. Regulatory requirements for your application determine which certifications are acceptable.

Q: What is the operating temperature range difference, and does it matter? A: The main part and SCHURTER substitutes support -25°C ~ 85°C. The Littelfuse part is limited to -25°C ~ 70°C. Applications requiring operation above 70°C must use SCHURTER parts.