SCHURTER 0034.5127 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.5127 is a 1.25 A, 250 V AC/DC fast-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 ongoing system maintenance and new designs requiring identical electrical and mechanical specifications.

Substiute Parts

0034.5127

SCHURTER Inc.In Stock: 7260034.5127 Datasheet

Current PartRFQ

8020.5069

SCHURTER Inc.In Stock: 14078020.5069 Datasheet

SimilarRFQ

03121.25MXP

Littelfuse Inc.In Stock: 139503121.25MXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SCHURTER 0034.5127 are identified based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Current Rating: 1.25 A (exact match required)
• Voltage Rating: 250 V AC minimum (equal or higher voltage rating acceptable)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (mechanical compatibility with existing holders)
• Response Time: Fast Blow (electrical characteristic match)
• Mounting Type: Requires Holder (same installation method)

Substitution Categories:

Category 1: Direct Glass Fuse Equivalent The Littelfuse 03121.25MXP provides an active-status direct replacement with identical electrical ratings, fuse material (glass), and package dimensions. This part maintains the same current rating, voltage rating, and response time characteristics.

Category 2: Higher Voltage Ceramic Alternative The SCHURTER 8020.5069 offers a ceramic fuse construction with identical current rating and package format but elevated voltage rating (500 V AC). This part is suitable for applications where higher voltage capability is required or beneficial, while maintaining mechanical compatibility and fast-blow response characteristics.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): The Littelfuse 03121.25MXP is the preferred substitute for the obsolete SCHURTER 0034.5127. Both parts are glass cartridge fuses with 1.25 A current rating and 250 V AC voltage rating. The Littelfuse part is currently in active production status with broader regulatory approvals (CE, CSA, KC, PSE, UL) compared to the original part (CSA, UL). Mechanical compatibility is confirmed through identical package format and dimensions. The operating temperature range is identical (-55°C ~ 125°C), ensuring thermal performance equivalence.

For Enhanced Voltage Capability: The SCHURTER 8020.5069 ceramic fuse provides a substitute option when higher voltage rating (500 V AC) is required or when ceramic construction is preferred over glass. This part maintains identical current rating (1.25 A), package format (3AB, 3AG), and fast-blow response time. The ceramic construction offers superior breaking capacity (1.5 kA versus 200 A at rated voltage). However, the operating temperature range is reduced (-40°C ~ 85°C), which may be a limiting factor in extreme temperature applications.

Compliance Considerations: The Littelfuse 03121.25MXP carries RoHS3 compliance and REACH unaffected status. The SCHURTER 8020.5069 also carries RoHS3 compliance and REACH unaffected status. Both substitute parts meet or exceed the regulatory framework of the original obsolete component.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 03121.25MXP be used as a direct replacement for the SCHURTER 0034.5127?

A: Yes. Both parts are 1.25 A, 250 V AC fast-blow glass cartridge fuses in the 3AB/3AG package format. Mechanical and electrical compatibility is confirmed. The Littelfuse part is in active production status, making it the recommended direct substitute.

Q: What is the difference between the glass fuse (Littelfuse 03121.25MXP) and the ceramic fuse (SCHURTER 8020.5069)?

A: The primary differences are material construction and voltage rating. The Littelfuse part is glass construction rated at 250 V AC, matching the original specification. The SCHURTER ceramic part is rated at 500 V AC, providing higher voltage capability. Both maintain identical current rating (1.25 A) and package format. Ceramic fuses typically offer higher breaking capacity and are suitable for applications requiring enhanced fault protection.

Q: Are the physical dimensions identical between all three parts?

A: The dimensions are functionally equivalent. The SCHURTER 0034.5127 and SCHURTER 8020.5069 are both 0.250" Dia x 1.252" L. The Littelfuse 03121.25MXP is 0.250" Dia x 1.250" L, a difference of 0.002" in length. This minor dimensional variation does not affect compatibility with standard 3AB/3AG fuse holders.

Q: What is the operating temperature range for each part?

A: The SCHURTER 0034.5127 and Littelfuse 03121.25MXP both operate from -55°C to 125°C. The SCHURTER 8020.5069 operates from -40°C to 85°C. For applications requiring the full -55°C to 125°C range, the Littelfuse part is the appropriate choice.

Q: Which substitute part has the highest breaking capacity?

A: The SCHURTER 8020.5069 ceramic fuse has a breaking capacity of 1.5 kA at rated voltage, compared to 200 A for the original SCHURTER 0034.5127 and 100 A for the Littelfuse 03121.25MXP. Higher breaking capacity provides enhanced protection in high-fault-current applications.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the Littelfuse 03121.25MXP and SCHURTER 8020.5069 are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Can I use the SCHURTER 8020.5069 in a circuit designed for 250 V AC?

A: Yes. The SCHURTER 8020.5069 is rated for 500 V AC, which exceeds the 250 V AC requirement. A higher voltage-rated fuse can be used in lower voltage applications without compromising safety or performance, provided all other electrical parameters (current rating, response time) remain compatible.