SCHURTER 0034.5246 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.5246 is a 12 A, 125 V AC/DC slow-blow glass cartridge fuse in the 3AB/3AG package format (1/4" x 1-1/4"). This component is classified as obsolete and requires a compatible fuse holder for installation. Due to its obsolete status, equivalent substitute parts are necessary for continued system support and procurement.

Substiute Parts

0034.5246

SCHURTER Inc.In Stock: 11340034.5246 Datasheet

Current PartRFQ

8020.5022

SCHURTER Inc.In Stock: 75248020.5022 Datasheet

SimilarRFQ

0313012.MXP

Littelfuse Inc.In Stock: 18090313012.MXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SCHURTER 0034.5246 is determined by the following critical parameters:

Physical Compatibility:

• Package format (3AB, 3AG cartridge standard)
• Physical dimensions (0.250" Dia x 1.252" L)
• Mounting type (requires holder)

Electrical Compatibility:

• Current rating (12 A nominal)
• Voltage rating (125 V AC minimum)
• Response time (slow-blow characteristic)
• Fuse type (cartridge, glass construction)

Regulatory Compliance:

• Approval agencies (UL, CSA certifications)
• Operating temperature range (-55°C ~ 125°C)

The substitute parts listed below satisfy these core parameters within the constraints of their respective electrical ratings and certifications.

Parameter Comparison

Engineering Selection Recommendations

Littelfuse 0313012.MXP is the primary equivalent substitute for the SCHURTER 0034.5246. Both components share identical current ratings (12 A), matching fuse type (cartridge, glass), identical response time (slow-blow), and compatible package format (3AB, 3AG). The Littelfuse part maintains the same operating temperature range (-55°C ~ 125°C) and carries UL approval. The voltage rating difference (32 V AC versus 125 V AC) represents a design constraint; the Littelfuse part operates at lower voltage but is suitable for applications where the system voltage does not exceed 32 V AC. Physical dimensions are equivalent within manufacturing tolerance (31.75mm versus 31.80mm length).

SCHURTER 8020.5022 is a secondary alternative with significant parameter differences. While it maintains the 12 A current class (12.5 A rated) and slow-blow response, it uses ceramic construction instead of glass and operates at 400 V AC/DC. The package format is listed as non-standard cartridge, which may present compatibility issues with standard 3AB/3AG holders. The breaking capacity (1.5 kA AC) is substantially lower than the original part (10 kA), and the operating temperature range is narrower (-40°C ~ 85°C). This part is suitable only for applications where voltage requirements exceed 125 V and holder compatibility is confirmed.

Selection should prioritize the Littelfuse 0313012.MXP for direct replacement in 32 V AC or lower voltage systems. The SCHURTER 8020.5022 is applicable only when higher voltage operation (400 V) is required and holder compatibility is verified.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0313012.MXP directly replace the SCHURTER 0034.5246 in all applications?

A: The Littelfuse part is physically and electrically compatible for applications operating at 32 V AC or lower. The voltage rating difference must be evaluated against the actual system voltage. If the system operates above 32 V AC, this substitution is not appropriate.

Q: What is the significance of the fuse type difference between the SCHURTER 0034.5246 (glass) and SCHURTER 8020.5022 (ceramic)?

A: Glass and ceramic cartridge fuses have different thermal and electrical characteristics. Glass fuses are transparent, allowing visual inspection of the element. Ceramic fuses offer higher voltage ratings and different breaking capacity profiles. The choice depends on system voltage requirements and holder compatibility.

Q: Are the physical dimensions of the Littelfuse 0313012.MXP and SCHURTER 0034.5246 identical?

A: The dimensions are equivalent within standard manufacturing tolerance. The SCHURTER part measures 0.250" Dia x 1.252" L, while the Littelfuse part measures 0.250" Dia x 1.250" L. This 0.002" difference in length is within acceptable tolerance for standard 3AB/3AG holders.

Q: What does "slow-blow" response time mean?

A: Slow-blow fuses tolerate temporary current surges without opening. They are designed to carry brief overcurrent conditions while protecting against sustained overcurrent or short-circuit events. All three parts listed share this characteristic.

Q: Why is the SCHURTER 0034.5246 classified as obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. Active alternatives (Littelfuse 0313012.MXP and SCHURTER 8020.5022) are available for new designs and replacement applications.

Q: What is the breaking capacity, and why does it differ among these parts?

A: Breaking capacity is the maximum current the fuse can safely interrupt at its rated voltage. The SCHURTER 0034.5246 has 10 kA breaking capacity at 125 V, while the SCHURTER 8020.5022 has 1.5 kA AC at 400 V. Higher voltage ratings typically result in lower breaking capacity values. System design must ensure the fuse breaking capacity exceeds the maximum available fault current.

Q: Can the SCHURTER 8020.5022 be used in a standard 3AB/3AG holder?

A: The SCHURTER 8020.5022 is listed as a non-standard cartridge package. Compatibility with standard 3AB/3AG holders must be confirmed with the holder manufacturer before substitution.

Q: What certifications apply to each substitute part?

A: The SCHURTER 0034.5246 carries CSA and UL approvals. The Littelfuse 0313012.MXP carries UL approval. The SCHURTER 8020.5022 carries cURus approval. System requirements may mandate specific certification standards.