SCHURTER 3-103-104 Surface Mount Fuse – Equivalent & Substitute Parts

Part Overview

The SCHURTER 3-103-104 is a 750 mA, 125 V AC/DC surface mount board fuse in the MGA-A series, designed for fast-blow protection in compact 2-SMD square end block packaging. This component is active in production and widely used in power distribution and circuit protection applications requiring reliable overcurrent protection at low voltage levels.

Substitute parts are necessary when addressing supply chain constraints, packaging format requirements, or when upgrading to enhanced thermal performance specifications while maintaining electrical compatibility.

Substiute Parts

3-103-104

SCHURTER Inc.In Stock: 11773-103-104 Datasheet

Current PartRFQ

3410.0029.02

SCHURTER Inc.In Stock: 32003410.0029.02 Datasheet

UpgradeRFQ

3410.0029.03

SCHURTER Inc.In Stock: 37233410.0029.03 Datasheet

UpgradeRFQ

3-103-103

SCHURTER Inc.In Stock: 33223-103-103 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3-103-104 is determined by strict equivalence across the following critical parameters:

• Current Rating: 750 mA (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Package / Case: 2-SMD, Square End Block (exact match required)
• Breaking Capacity: 50 A AC, 300 A DC (exact match required)
• Physical Dimensions: 3.20mm x 1.55mm x 1.55mm (exact match required)

All listed substitute parts meet these criteria. Differences in packaging format (Tape & Reel versus Cut Tape), series designation (MGA-A versus MGA), operating temperature range, and melting I²t values do not affect electrical substitutability for the specified application.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed are active production components from SCHURTER Inc. and maintain full electrical and mechanical compatibility with the 3-103-104 in applications requiring 750 mA, 125 V AC/DC fast-blow protection.

3410.0029.02 and 3410.0029.03 (Upgrade Options): These parts offer extended operating temperature range (-55°C to 150°C versus -55°C to 125°C) and are supplied in Tape & Reel packaging. Both carry cURus certification. Selection between these two upgrade variants depends on specific procurement and inventory requirements, as they are electrically and mechanically identical.

3-103-103 (Packaging Alternative): This part is identical to the main part 3-103-104 except for packaging format (Cut Tape versus Tape & Reel). It maintains the same MGA-A series designation, operating temperature range, and dual cURus/UL certification. This option is suitable when Cut Tape packaging is preferred for manual assembly or lower-volume applications.

All parts comply with ROHS3 and carry EAR99 ECCN classification.

Frequently Asked Questions (FAQ)

Q: Can 3410.0029.02 or 3410.0029.03 be used as direct replacements for 3-103-104?

A: Yes. Both parts are electrically and mechanically equivalent. They maintain identical current rating (750 mA), voltage ratings (125 V AC/DC), response time (Fast Blow), package type (2-SMD, Square End Block), and physical dimensions (3.20mm x 1.55mm x 1.55mm). The extended operating temperature range (-55°C to 150°C) provides additional thermal margin in applications where the main part's -55°C to 125°C range is marginal.

Q: What is the difference between 3410.0029.02 and 3410.0029.03?

A: These parts are electrically and mechanically identical. Both are supplied in Tape & Reel packaging and carry cURus certification. Differences in part number designation reflect internal SCHURTER product line management and do not affect functional performance or compatibility.

Q: When should 3-103-103 be selected instead of the main part?

A: The 3-103-103 is functionally equivalent to 3-103-104 and differs only in packaging format (Cut Tape versus Tape & Reel). Select 3-103-103 when Cut Tape packaging is required for manual assembly processes, prototype builds, or applications where reel-based automated placement is not used.

Q: Are there any certification differences between these parts?

A: The main part 3-103-104 and substitute 3-103-103 carry dual cURus and UL certification. The upgrade parts 3410.0029.02 and 3410.0029.03 carry cURus certification. Verify certification requirements for your specific application before selection.

Q: Do these parts have different melting I²t values?

A: Yes. The main part 3-103-104 and 3-103-103 have a melting I²t of 0.003, while 3410.0029.02 and 3410.0029.03 have a melting I²t of 0.01. This difference reflects internal fuse element design but does not affect the 750 mA current rating or fast-blow response time. Both values are within acceptable parameters for the specified 750 mA protection class.

Q: Are all parts ROHS3 compliant?

A: Yes. All listed parts—3-103-104, 3410.0029.02, 3410.0029.03, and 3-103-103—are ROHS3 compliant and REACH unaffected.