SCHURTER 0034.7221 Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.7221 is a 4A 250VAC board mount radial fuse designed for through-hole applications. This component belongs to the MSTU 250 series and is classified as active product status. The fuse provides slow-blow response characteristics with a 50A breaking capacity at rated voltage. Substitute parts are identified when equivalent electrical and mechanical parameters are maintained across the same functional category, enabling seamless integration into existing circuit designs without performance degradation.

Substiute Parts

0034.7221

SCHURTER Inc.In Stock: 10380034.7221 Datasheet

Current PartRFQ

0034.6921

SCHURTER Inc.In Stock: 48860034.6921 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SCHURTER 0034.7221 is determined by strict equivalence across the following critical parameters:

• Current Rating: 4 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Board Mount (Cartridge Style Excluded)
• Mounting Type: Through Hole
• Package / Case: Radial, Can, Vertical
• Response Time: Slow Blow
• Physical Dimensions: 0.335" Dia x 0.335" H (8.50mm x 8.50mm)
• Operating Temperature Range: -40°C ~ 85°C

The substitute part 0034.6921 maintains all critical electrical and mechanical parameters. Variations in breaking capacity (50A vs. 100A) and melting I²t values represent enhanced performance characteristics that do not preclude substitution, as higher breaking capacity provides additional safety margin. Differences in approval agency certifications reflect regional compliance variations and do not affect functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

Both the SCHURTER 0034.7221 and 0034.6921 maintain active product status and full ROHS3 compliance. The 0034.6921 provides enhanced breaking capacity (100A versus 50A) and higher melting I²t characteristics, representing a performance upgrade within the same electrical and mechanical envelope. Selection between these parts should be based on application-specific breaking capacity requirements and regional certification needs. The 0034.6921 carries broader approval agency recognition (CCC, cURus, KC, PSE/JET, VDE) compared to the 0034.7221 (cULus), which may be relevant for international market applications.

Frequently Asked Questions (FAQ)

Q: Can the 0034.6921 be used as a direct replacement for the 0034.7221?

A: Yes. Both parts share identical current rating (4A), voltage rating (250VAC), mounting type (through-hole), package configuration (radial, can, vertical), and physical dimensions (8.50mm x 8.50mm). The 0034.6921 provides higher breaking capacity and melting I²t, which does not compromise compatibility.

Q: What is the significance of the different breaking capacity ratings?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. The 0034.6921 (100A) provides enhanced fault protection compared to the 0034.7221 (50A). This represents an improvement in safety margin and does not affect normal circuit operation.

Q: Are there differences in approval certifications between these parts?

A: Yes. The 0034.7221 carries cULus certification, while the 0034.6921 carries CCC, cURus, KC, PSE/JET, and VDE certifications. Selection should align with regional compliance requirements for the target application.

Q: Do these parts have identical physical dimensions?

A: Yes. Both parts measure 0.335" diameter x 0.335" height (8.50mm x 8.50mm) and are configured for radial, can, vertical mounting in through-hole applications.

Q: What is the melting I²t parameter and why does it differ?

A: Melting I²t represents the thermal energy required to melt the fuse element. The 0034.6921 (77) has a higher value than the 0034.7221 (67.2), indicating slightly different thermal characteristics while maintaining the same 4A current rating and slow-blow response profile.