SCHURTER 0034.4281 Board Mount Fuse — Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.4281 is a 1 A, 125 V AC/DC board mount radial fuse with fast blow response time, designed for through-hole PCB assembly. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The fuse is rated for 300 A breaking capacity at rated voltage and operates across -25°C to 85°C. Substitute parts must maintain electrical equivalence in current rating, voltage rating, response time, and mechanical compatibility while meeting the same regulatory approvals.

Substiute Parts

0034.4281

SCHURTER Inc.In Stock: 10350034.4281 Datasheet

Current PartRFQ

0034.4221

SCHURTER Inc.In Stock: 21260034.4221 Datasheet

Parametric EquivalentRFQ

0034.4251

SCHURTER Inc.In Stock: 20490034.4251 Datasheet

Parametric EquivalentRFQ

0273001.H

LittelfuseIn Stock: 15480273001.H Datasheet

DirectRFQ

0272001.H

Littelfuse Inc.In Stock: 11220272001.H Datasheet

SimilarRFQ

0272001.V

Littelfuse Inc.In Stock: 8700272001.V Datasheet

SimilarRFQ

0273001.V

Littelfuse Inc.In Stock: 9020273001.V Datasheet

SimilarRFQ

30311000421

Littelfuse Inc.In Stock: 128630311000421 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SCHURTER 0034.4281 is determined by strict equivalence in the following parameters:

• Current Rating: 1 A (mandatory)
• Voltage Rating (AC/DC): 125 V AC and 125 V DC (mandatory)
• Response Time: Fast Blow (mandatory)
• Mounting Type: Through Hole (mandatory)
• Fuse Type: Board Mount, Cartridge Style Excluded (mandatory)
• Package / Case: Radial, Can configuration (mandatory)
• RoHS Compliance: ROHS3 Compliant (mandatory)

Substitute parts are grouped into three categories:

1. Parametric Equivalents (SCHURTER Series): Parts 0034.4221 and 0034.4251 match all electrical and mechanical parameters. These are active products from the same manufacturer with identical current, voltage, and response characteristics. Breaking capacity differs (100 A vs. 300 A), but this does not affect substitution eligibility for equivalent circuit protection.

2. Direct Manufacturer Equivalents (Littelfuse): Part 0273001.H meets all core electrical parameters with identical current, voltage, and response time. Physical dimensions are nominally equivalent (0.250" Dia × 0.350" H vs. 0.252" Dia × 0.346" H). Breaking capacity is significantly higher (10 kA), and approval agencies include CSA, QPL, and UL, exceeding the original cURus requirement.

3. Similar Equivalents (Littelfuse MICRO™ Series): Parts 0272001.H, 0272001.V, and 0273001.V maintain electrical equivalence but with dimensional or temperature range variations. Part 0272001.H and 0272001.V feature a smaller package (0.235" Dia × 0.287" H) and extended temperature range (-55°C ~ 125°C). Part 0273001.V matches the 0273001.H dimensions but with identical electrical ratings.

4. Partial Equivalents: Part 30311000421 (Littelfuse TR3® 303) maintains 1 A current rating and 125 V AC voltage but is rated for 63 V DC only, making it unsuitable for full 125 V DC applications. This part is listed for reference but does not constitute a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement)

Parts 0034.4221 and 0034.4251 are the preferred substitutes. Both are active SCHURTER products with identical electrical ratings, response time, and mechanical dimensions to the obsolete 0034.4281. Packaging is available in bulk. These parts maintain cURus approval and ROHS3 compliance. The reduction in breaking capacity from 300 A to 100 A does not compromise circuit protection function for standard 1 A applications.

Secondary Substitutes (Cross-Manufacturer Alternatives)

Littelfuse 0273001.H and 0273001.V provide electrical equivalence with enhanced regulatory coverage (CSA, QPL, UL certifications). Both are active products with 10 kA breaking capacity. Dimensional compatibility is maintained within standard PCB assembly tolerances. The 0273001.H variant operates across -55°C to 85°C, matching the original temperature range. The 0273001.V extends the upper temperature limit to 85°C. Both parts are ROHS3 compliant and REACH unaffected.

Alternative Substitutes (Dimensional Considerations)

Littelfuse 0272001.H and 0272001.V offer the same electrical ratings with a smaller package footprint (0.235" Dia × 0.287" H). These parts feature extended operating temperature range (-55°C ~ 125°C) and 10 kA breaking capacity. PCB layout modifications may be required due to dimensional differences. Both are active products with CSA, QPL, and UL approvals.

Not Recommended

Part 30311000421 is not suitable as a substitute due to reduced DC voltage rating (63 V DC vs. 125 V DC). This part does not meet the electrical equivalence requirement for the original application.

Frequently Asked Questions (FAQ)

Q: Can I use SCHURTER 0034.4221 or 0034.4251 as direct replacements for the obsolete 0034.4281?

A: Yes. Both parts are active SCHURTER products with identical current rating (1 A), voltage rating (125 V AC/DC), response time (Fast Blow), and mechanical dimensions. They maintain the same through-hole radial can package and cURus approval. The breaking capacity reduction from 300 A to 100 A does not affect substitution eligibility for standard circuit protection applications.

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

A: SCHURTER 0034.4221 and 0034.4251 are direct parametric equivalents with identical dimensions and cURus approval. Littelfuse alternatives (0273001.H, 0273001.V, 0272001.H, 0272001.V) provide equivalent electrical performance with enhanced regulatory certifications (CSA, QPL, UL). Littelfuse parts feature higher breaking capacity (10 kA) and extended temperature ranges. Dimensional variations exist: 0272001.H and 0272001.V use a smaller package (0.235" Dia × 0.287" H) compared to the original 0.252" Dia × 0.346" H.

Q: Are there any PCB layout considerations when switching to Littelfuse substitutes?

A: Littelfuse 0273001.H and 0273001.V maintain nominal dimensional compatibility with the original part (0.250" Dia × 0.350" H vs. 0.252" Dia × 0.346" H). Littelfuse 0272001.H and 0272001.V use a smaller package (0.235" Dia × 0.287" H), which may require PCB footprint verification. All Littelfuse parts maintain through-hole radial can configuration and standard lead spacing.

Q: Why is part 30311000421 not recommended as a substitute?

A: Part 30311000421 has a reduced DC voltage rating of 63 V, compared to the required 125 V DC for the original application. While it maintains the 1 A current rating and 125 V AC rating, the lower DC voltage rating makes it unsuitable for circuits requiring full 125 V DC protection.

Q: What compliance certifications should I verify when selecting a substitute?

A: The original part carries cURus approval. SCHURTER substitutes (0034.4221, 0034.4251) maintain cURus certification. Littelfuse alternatives carry CSA, QPL, and UL certifications, which exceed the original requirement. All recommended substitutes are ROHS3 compliant and REACH unaffected. Verify that selected certifications meet your application's regulatory requirements.

Q: Can I use 0272001.H or 0272001.V if my application requires the extended temperature range?

A: Yes. Both 0272001.H and 0272001.V operate across -55°C to 125°C, providing extended temperature coverage beyond the original -25°C to 85°C range. These parts maintain all electrical equivalence parameters (1 A, 125 V AC/DC, Fast Blow) and are suitable for applications requiring wider temperature operation. PCB layout verification is required due to the smaller package dimensions.