Littelfuse TR5® 373 37305000430 Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 37305000430 is a 500 mA, 250 V AC/DC board mount fuse with fast blow response characteristics, designed for through-hole radial mounting in radial can vertical package configuration. This Active product is CSA and cULus approved for general circuit protection applications. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical compatibility, and functional performance parameters.

Substiute Parts

37305000430

Littelfuse Inc.In Stock: 104937305000430 Datasheet

Current PartRFQ

37305000410

Littelfuse Inc.In Stock: 168037305000410 Datasheet

DirectRFQ

37005000410

Littelfuse Inc.In Stock: 215137005000410 Datasheet

Parametric EquivalentRFQ

37005000430

Littelfuse Inc.In Stock: 84337005000430 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 37305000430 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 500 mA
• Voltage Rating (AC): 250 V
• Mounting Type: Through Hole
• Package / Case: Radial, Can, Vertical
• Size / Dimension: 0.335" Dia x 0.315" H (8.50mm x 8.00mm)
• Response Time: Fast Blow
• Breaking Capacity @ Rated Voltage: 50A

Acceptable Variation Parameters:

• Melting I²t: 0.025 to 0.042 (within thermal performance tolerance)
• Approval Agency: CSA, cULus, CCC, cURus, SEMKO, VDE (all acceptable certifications)
• Series: TR5® 373 or TR5® 370 (same product family)

All identified substitute parts maintain identical electrical and mechanical specifications, ensuring direct functional replacement in circuit protection applications.

Parameter Comparison

Engineering Selection Recommendations

All four parts listed are Active products with ROHS3 compliance and REACH Unaffected status, suitable for current applications and future regulatory requirements.

37305000410: Direct manufacturer equivalent with identical electrical and thermal characteristics (Melting I²t: 0.025). Maintains TR5® 373 series designation. CSA and cULus approvals match the main part. Highest inventory availability (1609 pcs).

37005000410 and 37005000430: Parametric equivalents from the TR5® 370 series with expanded approval agency coverage (CCC, cURus, SEMKO, VDE). Both feature Melting I²t of 0.042, indicating slightly different thermal response within acceptable tolerance. Selection between these parts depends on specific regional certification requirements and thermal performance needs.

All substitute parts maintain identical current rating, voltage rating, mounting configuration, and physical dimensions, ensuring direct functional replacement without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can 37305000410 be used as a direct replacement for 37305000430?

A: Yes. Both parts share identical electrical ratings (500 mA, 250 V), response time (Fast Blow), mechanical configuration (Through Hole, Radial Can Vertical), and physical dimensions (0.335" Dia x 0.315" H). Both are CSA and cULus approved Active products with ROHS3 compliance.

Q: What is the difference between TR5® 373 and TR5® 370 series parts?

A: Both series maintain identical electrical and mechanical specifications for the 500 mA, 250 V rating. The primary difference is approval agency coverage: TR5® 373 parts carry CSA and cULus approvals, while TR5® 370 parts include CCC, cURus, SEMKO, and VDE certifications. Series selection depends on regional regulatory requirements.

Q: Are the Melting I²t differences (0.025 vs 0.042) significant for substitution?

A: Both values fall within acceptable thermal performance tolerance for this product category. The difference reflects thermal response characteristics within the fast blow classification. Selection should be based on specific circuit protection requirements and regional certification needs rather than this parameter alone.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. All substitute parts maintain identical current rating, voltage rating, mounting type, package configuration, and physical dimensions. No circuit redesign or PCB modification is required for substitution.

Q: Which part should be selected for new designs?

A: Selection depends on regional certification requirements and supply chain considerations. For CSA/cULus markets, 37305000430 or 37305000410 are appropriate. For markets requiring CCC, SEMKO, or VDE certification, 37005000410 or 37005000430 are suitable. All parts are Active products with current availability.