SCHURTER 0034.4279 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.4279 is a 750 mA, 125 V AC/DC board mount fuse with fast blow response time, housed in a radial can package. This part operates within the MSF 125 series and is currently classified as obsolete. Due to its discontinued status, identifying equivalent and substitute parts from active product lines is essential for ongoing design support and procurement continuity.

Substiute Parts

0034.4279

SCHURTER Inc.In Stock: 9070034.4279 Datasheet

Current PartRFQ

0034.4219

SCHURTER Inc.In Stock: 19960034.4219 Datasheet

Parametric EquivalentRFQ

0034.4249

SCHURTER Inc.In Stock: 10490034.4249 Datasheet

Parametric EquivalentRFQ

0273.750H

Littelfuse Inc.In Stock: 7110273.750H Datasheet

DirectRFQ

0272.750H

Littelfuse Inc.In Stock: 11060272.750H Datasheet

SimilarRFQ

0272.750V

Littelfuse Inc.In Stock: 8560272.750V Datasheet

SimilarRFQ

0279.750V

Littelfuse Inc.In Stock: 10990279.750V Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCHURTER 0034.4279 is determined by strict alignment of the following parameters:

Critical Parameters (Must Match Exactly):

• Current Rating: 750 mA
• Voltage Rating (AC): 125 V
• Voltage Rating (DC): 125 V
• Response Time: Fast Blow
• Mounting Type: Through Hole
• Fuse Type: Board Mount (Cartridge Style Excluded)

Acceptable Variation Parameters:

• Package / Case: Radial, Can (vertical orientation acceptable)
• Size / Dimension: Nominal equivalence within 0.015" tolerance
• Operating Temperature Range: Equal or extended range acceptable
• Breaking Capacity: Higher values acceptable (provides enhanced protection margin)
• Melting I²t: Variation acceptable within thermal response characteristics

Substitute Categories:

Parametric Equivalents (SCHURTER): Parts 0034.4219 and 0034.4249 maintain identical electrical specifications and package form factor. These are direct replacements within the same manufacturer's active product line.

Direct Manufacturer Equivalents (Littelfuse): Part 0273.750H meets all critical electrical parameters with enhanced breaking capacity (10 kA vs. 300 A) and extended temperature range (-55°C ~ 85°C). Vertical package orientation is mechanically compatible.

Similar Manufacturer Equivalents (Littelfuse): Parts 0272.750H, 0272.750V, and 0279.750V satisfy all critical electrical parameters with superior breaking capacity and extended temperature ranges. Dimensional variations are within acceptable mechanical tolerances for board mount applications.

Parameter Comparison

Engineering Selection Recommendations

First Priority - SCHURTER 0034.4219 and 0034.4249: These parts are direct parametric equivalents from SCHURTER's active MSF 125 series. Both maintain identical electrical specifications, package dimensions, and thermal characteristics as the obsolete 0034.4279. Selection between these two is determined by packaging preference (both available in bulk) and inventory availability. Both carry cURus approval and ROHS3 compliance matching the original part.

Second Priority - Littelfuse 0273.750H: This part satisfies all critical electrical parameters with enhanced breaking capacity (10 kA) and extended low-temperature operating range (-55°C). The vertical package orientation is mechanically compatible with radial through-hole board mount applications. Dimensional tolerance (0.250" Dia x 0.350" H) is within acceptable mechanical limits. CSA, QPL, and UL approvals provide broader regulatory coverage than the original cURus certification.

Third Priority - Littelfuse 0272.750H, 0272.750V, and 0279.750V: These parts meet all critical electrical parameters with superior breaking capacity (10 kA) and extended operating temperature ranges. The 0272 series supports temperatures to 125°C, providing enhanced thermal margin. Dimensional variations (0.235" Dia x 0.287" H for 0272 series; 0.250" Dia x 0.350" H for 0279.750V) require mechanical board layout verification for clearance compatibility. All carry CSA, QPL, and UL approvals.

Compliance Considerations: All substitute parts maintain ROHS3 compliance and REACH unaffected status. Littelfuse parts provide enhanced regulatory certifications (CSA, QPL, UL) compared to the original cURus approval, supporting broader application requirements.

Frequently Asked Questions (FAQ)

Q: Can I use SCHURTER 0034.4219 or 0034.4249 as direct replacements for the obsolete 0034.4279?

A: Yes. Both parts are parametric equivalents with identical current rating (750 mA), voltage ratings (125 V AC/DC), response time (fast blow), and package dimensions (0.252" Dia x 0.346" H). They are active products from SCHURTER's MSF 125 series and provide direct functional substitution.

Q: What is the difference between the SCHURTER substitutes and the Littelfuse options?

A: SCHURTER 0034.4219 and 0034.4249 are identical electrical and mechanical replacements. Littelfuse parts (0273.750H, 0272.750H, 0272.750V, 0279.750V) maintain the same electrical specifications but offer enhanced breaking capacity (10 kA vs. 300 A) and extended operating temperature ranges. Littelfuse parts carry CSA, QPL, and UL certifications versus the original cURus approval.

Q: Are there dimensional differences between the main part and substitute options?

A: SCHURTER substitutes (0034.4219, 0034.4249) have identical dimensions (0.252" Dia x 0.346" H). Littelfuse 0273.750H and 0279.750V are nominally equivalent (0.250" Dia x 0.350" H, within 0.015" tolerance). Littelfuse 0272.750H and 0272.750V are smaller (0.235" Dia x 0.287" H) and require board layout verification for clearance compatibility.

Q: Can I use Littelfuse parts in applications originally designed for the SCHURTER 0034.4279?

A: Yes, provided the board layout accommodates the package dimensions and the application does not require the specific cURus certification. Littelfuse parts meet all critical electrical parameters and provide enhanced breaking capacity and temperature range, making them suitable for equivalent or more demanding applications.

Q: What is the significance of the breaking capacity difference (300 A vs. 10 kA)?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. Littelfuse parts with 10 kA breaking capacity provide enhanced protection margin in high-fault-current environments. For applications designed around the original 300 A specification, Littelfuse substitutes offer improved safety performance.

Q: Which substitute should I select for new designs?

A: For direct replacement in existing designs, select SCHURTER 0034.4219 or 0034.4249. For new designs or applications requiring extended temperature range or enhanced fault protection, Littelfuse 0273.750H or 0279.750V are recommended. The 0272 series is suitable only if board layout accommodates the smaller package dimensions.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance status of the original 0034.4279.