SCHURTER 0034.4282 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The SCHURTER 0034.4282 is a 1.25 A, 125 VAC/VDC board mount fuse with fast blow response time, designed for through-hole radial mounting in radial can package configuration. This part is classified as obsolete, making identification of active equivalent and substitute parts essential for ongoing design support and procurement continuity. Active alternatives maintain the same electrical ratings and mechanical form factor while offering current production availability.

Substiute Parts

0034.4282

SCHURTER Inc.In Stock: 8840034.4282 Datasheet

Current PartRFQ

0034.4222

SCHURTER Inc.In Stock: 9890034.4222 Datasheet

SimilarRFQ

0034.4252

SCHURTER Inc.In Stock: 10140034.4252 Datasheet

Parametric EquivalentRFQ

30311250421

Littelfuse Inc.In Stock: 85530311250421 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0034.4282 is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Critical Parameters (Must Match):

• Current Rating: 1.25 A
• Voltage Rating - AC: 125 V
• Mounting Type: Through Hole
• Fuse Type: Board Mount (Cartridge Style Excluded)
• Response Time: Fast Blow
• Package / Case: Radial, Can configuration

Secondary Parameters (Allowable Variation):

• Voltage Rating - DC: May vary based on application requirements
• Breaking Capacity: May vary within acceptable operating margins
• Melting I²t: May vary within acceptable operating margins
• Physical dimensions: Minor variations acceptable if mounting compatibility maintained
• Operating Temperature Range: May vary if application requirements are met

The substitute parts listed below maintain all critical parameters. Variations in secondary parameters are documented to enable informed selection based on specific circuit requirements.

Parameter Comparison

Engineering Selection Recommendations

SCHURTER 0034.4222 and 0034.4252: Both parts are active production alternatives from SCHURTER Inc. within the MSF 125 series. These parts maintain identical electrical ratings (1.25 A, 125 VAC/125 VDC) and mechanical dimensions to the 0034.4282. The primary difference is reduced breaking capacity (100 A versus 300 A) and lower melting I²t (0.12 maintained). Both parts carry cURus approval and ROHS3 compliance. Selection between these two SCHURTER alternatives depends on packaging requirements (both available in bulk) and circuit-specific breaking capacity needs.

Littelfuse 30311250421: This part provides an active alternative from a different manufacturer with equivalent current rating (1.25 A) and AC voltage rating (125 V). The DC voltage rating is reduced to 63 V, making this part suitable only for applications where DC voltage does not exceed 63 V. Physical dimensions are slightly smaller (0.236" Dia x 0.315" H versus 0.252" Dia x 0.346" H), and breaking capacity is significantly lower at 50 A. The melting I²t is reduced to 0.059. This part carries CSA and UL approvals and operates within -25°C ~ 70°C temperature range. The Littelfuse option is appropriate for DC-limited circuits and applications where reduced breaking capacity is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the 0034.4222 or 0034.4252 be used as direct replacements for the obsolete 0034.4282?

A: Yes. Both SCHURTER parts maintain identical current rating (1.25 A), AC voltage rating (125 V), DC voltage rating (125 V), response time (fast blow), mounting type (through hole), and physical dimensions (0.252" Dia x 0.346" H). The reduced breaking capacity (100 A versus 300 A) is acceptable in applications where circuit fault current does not exceed 100 A. Verify circuit requirements before selection.

Q: What is the key difference between the SCHURTER 0034.4222 and 0034.4252?

A: Both parts are electrically and mechanically identical. The primary distinction is packaging: 0034.4222 and 0034.4252 are both available in bulk packaging. Consult inventory and procurement requirements for selection.

Q: Can the Littelfuse 30311250421 replace the 0034.4282 in all applications?

A: The Littelfuse part is suitable only for applications where DC voltage does not exceed 63 V. The main part and SCHURTER alternatives support 125 V DC. Additionally, the Littelfuse part has reduced breaking capacity (50 A) and lower melting I²t (0.059 versus 0.12). Verify circuit DC voltage and fault current requirements before substitution.

Q: Are there physical mounting differences between these parts?

A: The SCHURTER 0034.4282, 0034.4222, and 0034.4252 share identical dimensions (0.252" Dia x 0.346" H). The Littelfuse 30311250421 has slightly smaller dimensions (0.236" Dia x 0.315" H). Verify PCB footprint and mounting hole spacing compatibility before selection, particularly when substituting the Littelfuse part.

Q: What compliance certifications apply to these parts?

A: The SCHURTER parts (0034.4282, 0034.4222, 0034.4252) carry cURus approval. The Littelfuse 30311250421 carries CSA and UL approvals. All parts are ROHS3 compliant and REACH unaffected. Verify certification requirements for your specific application and regulatory jurisdiction.

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

A: SCHURTER parts operate within -25°C ~ 85°C. The Littelfuse part operates within -25°C ~ 70°C. Verify application operating temperature requirements, particularly for high-temperature environments where the SCHURTER parts provide extended range.