SCHURTER 0034.4239 Board Mount Fuse 100mA 125VAC/VDC Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.4239 is a board mount fuse rated for 100 mA at 125 V AC/DC with fast blow response time. This component is designed for through-hole radial mounting in a can package format. The part is active in production and widely stocked, with 851 units currently available. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, inventory constraints, or specific performance characteristics aligned with the electrical and mechanical parameters of the original specification.

Substiute Parts

0034.4239

SCHURTER Inc.In Stock: 8840034.4239 Datasheet

Current PartRFQ

0034.4209

SCHURTER Inc.In Stock: 23540034.4209 Datasheet

Parametric EquivalentRFQ

0272.100H

Littelfuse Inc.In Stock: 15070272.100H Datasheet

SimilarRFQ

0272.100V

Littelfuse Inc.In Stock: 9570272.100V Datasheet

SimilarRFQ

0278.100V

Littelfuse Inc.In Stock: 10540278.100V Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SCHURTER 0034.4239 are classified based on strict electrical and mechanical parameter alignment:

Parametric Equivalent: Part 0034.4209 (SCHURTER Inc.) matches all critical electrical parameters including current rating, voltage ratings, response time, and breaking capacity. Physical dimensions and thermal operating range are identical. This part is a direct equivalent suitable for one-to-one replacement.

Similar Substitutes: Parts 0272.100H, 0272.100V, and 0278.100V (Littelfuse Inc., MICRO™ series) share identical electrical specifications: 100 mA current rating, 125 V AC/DC voltage ratings, and fast blow response. These parts differ in physical dimensions (0.235" Dia x 0.287" H versus 0.252" Dia x 0.346" H), breaking capacity (10kA versus 100A), and operating temperature range (-55°C ~ 125°C versus -25°C ~ 85°C). Substitution requires verification of board layout compatibility and thermal environment suitability.

Parameter Comparison

Engineering Selection Recommendations

0034.4209 (SCHURTER Inc.): This part is the preferred parametric equivalent. All electrical and mechanical specifications are identical to the 0034.4239. Both parts carry cURus approval and ROHS3 compliance. Selection of this part requires no design modifications and provides direct compatibility. Current inventory of 2323 units supports high-volume applications.

0272.100H, 0272.100V, 0278.100V (Littelfuse Inc.): These parts satisfy all electrical requirements but introduce physical and thermal differences. The reduced physical dimensions (0.235" Dia x 0.287" H) require board layout verification to confirm fit within existing footprints. The extended operating temperature range (-55°C ~ 125°C) provides enhanced thermal performance for applications exceeding the original -25°C ~ 85°C specification. The 10kA breaking capacity exceeds the 100A rating of the original part, providing additional fault protection margin. These parts carry CSA, QPL, and UL approvals, meeting broader regulatory requirements. Selection of Littelfuse parts is appropriate when thermal performance, breaking capacity enhancement, or regulatory certification scope justifies the dimensional change.

Frequently Asked Questions (FAQ)

Q: Can the 0034.4209 be used as a direct replacement for the 0034.4239?

A: Yes. The 0034.4209 is a parametric equivalent with identical electrical ratings (100 mA, 125 V AC/DC, fast blow), breaking capacity (100A), operating temperature range (-25°C ~ 85°C), and physical dimensions (0.252" Dia x 0.346" H). No design modifications are required.

Q: What are the key differences between SCHURTER and Littelfuse substitute parts?

A: SCHURTER 0034.4209 matches all specifications of the original part. Littelfuse parts (0272.100H, 0272.100V, 0278.100V) maintain electrical equivalence but differ in three areas: physical dimensions are smaller (0.235" Dia x 0.287" H), operating temperature range is extended (-55°C ~ 125°C), and breaking capacity is higher (10kA). These differences require board layout verification and thermal environment assessment.

Q: Are the Littelfuse MICRO™ 272 and MICRO™ 278 series parts interchangeable?

A: Parts 0272.100H, 0272.100V, and 0278.100V share identical electrical specifications and physical dimensions. The primary distinction is series designation (MICRO™ 272 versus MICRO™ 278). Both series are suitable for applications requiring the specified 100 mA, 125 V AC/DC fast blow characteristics. Selection between series should be based on design documentation and supplier availability.

Q: What board layout considerations apply when substituting Littelfuse parts?

A: Littelfuse parts are physically smaller (0.235" Dia x 0.287" H) compared to the original SCHURTER part (0.252" Dia x 0.346" H). Verify that the reduced dimensions fit within the existing through-hole footprint and do not create clearance conflicts with adjacent components. The vertical orientation capability of Littelfuse parts may provide layout flexibility in space-constrained applications.

Q: Do all substitute parts meet the same regulatory approvals?

A: The SCHURTER 0034.4239 and 0034.4209 carry cURus approval. Littelfuse parts (0272.100H, 0272.100V, 0278.100V) carry CSA, QPL, and UL approvals. All parts are ROHS3 compliant and REACH unaffected. Selection should align with the specific regulatory requirements of the target application and end market.

Q: Can Littelfuse parts be used in applications with operating temperatures below -25°C or above 85°C?

A: Littelfuse parts are rated for -55°C ~ 125°C operation, extending the thermal envelope beyond the original SCHURTER specification (-25°C ~ 85°C). Use of Littelfuse parts is appropriate for applications requiring operation outside the original temperature range. Verify that the extended thermal capability aligns with system requirements and thermal management design.