SCHURTER 0034.3429 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.3429 is a 16A 250VAC glass cartridge fuse in the FST 6.3x32 series, designed for applications requiring slow-blow response characteristics. This component is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs. The fuse requires a compatible holder and operates across a temperature range of -55°C to 125°C with CE approval certification.

Substiute Parts

0034.3429

SCHURTER Inc.In Stock: 7660034.3429 Datasheet

Current PartRFQ

8020.5023

SCHURTER Inc.In Stock: 14708020.5023 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SCHURTER 0034.3429 is constrained by the following critical parameters:

• Current Rating: 16 A (must match exactly)
• Response Time: Slow Blow (must match exactly)
• Physical Dimensions: 0.250" Dia x 1.250" L (6.35mm x 31.75mm)
• Mounting Type: Requires Holder (mechanical compatibility)
• RoHS Compliance: ROHS3 Compliant (regulatory requirement)

The substitute part SCHURTER 8020.5023 shares the same current rating (16 A), response time (Slow Blow), physical dimensions (0.250" Dia x 1.252" L), and RoHS compliance status. However, it operates at higher voltage ratings (400V AC/DC) and uses ceramic construction instead of glass, making it suitable only for applications where the voltage environment permits the higher rating.

Parameter Comparison

Engineering Selection Recommendations

The SCHURTER 8020.5023 serves as an active substitute for the obsolete 0034.3429 based on matching current rating (16 A) and response time (Slow Blow) characteristics. Both components maintain ROHS3 compliance and are manufactured by SCHURTER Inc.

Selection of the 8020.5023 requires verification that the application voltage environment supports 400V AC/DC operation, as this represents a significant increase from the original 250V AC specification. The ceramic construction of the substitute provides enhanced breaking capacity (1.5kA AC vs. 160A) and improved DC voltage handling.

The operating temperature range of the substitute (-40°C to 85°C) is narrower than the original part (-55°C to 125°C). Applications requiring operation below -40°C or above 85°C cannot use this substitute without additional thermal management considerations.

The cURus approval certification of the substitute differs from the CE certification of the original part. Regulatory compliance verification is required for the specific application jurisdiction.

Frequently Asked Questions (FAQ)

Q: Can the SCHURTER 8020.5023 be used as a direct replacement in all applications?

A: No. The substitute operates at 400V AC/DC versus the original 250V AC rating. Use is limited to applications where the circuit voltage does not exceed 400V AC or DC. Verify circuit voltage specifications before substitution.

Q: What is the significance of the fuse type change from glass to ceramic?

A: The ceramic construction of the 8020.5023 provides superior breaking capacity and enhanced performance in high-fault-current environments. Both types maintain the same 16A current rating and slow-blow response time. Material selection depends on application fault-current requirements.

Q: Are the physical dimensions compatible with existing fuse holders?

A: Both components share the same 0.250" diameter specification. The length difference is minimal (1.250" vs. 1.252"). Mechanical fit compatibility with existing 3AB/3AG holders requires verification, as the substitute uses non-standard packaging designation.

Q: What certifications apply to the substitute part?

A: The SCHURTER 8020.5023 carries cURus certification, whereas the original part carries CE certification. Regulatory compliance requirements vary by application jurisdiction and must be verified independently.

Q: How do the melting I²t values affect substitution?

A: The original part specifies 1720 I²t versus 1400 I²t for the substitute. This indicates the substitute will melt at a lower energy level. Circuit protection characteristics may differ; thermal analysis is recommended for critical applications.

Q: Is the operating temperature range difference significant?

A: The substitute operates from -40°C to 85°C compared to the original -55°C to 125°C. Applications requiring operation outside the substitute's temperature range cannot use this part without additional thermal management or alternative solutions.