Littelfuse 37318000430 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37318000430 is an 8A 250VAC board mount fuse featuring radial, can-style vertical mounting for through-hole PCB applications. This fast-blow fuse is designed for circuit protection in AC/DC applications with a breaking capacity of 50A at rated voltage. The part maintains active product status with full cULus approval and ROHS3 compliance, making it suitable for industrial and commercial electronic equipment requiring reliable overcurrent protection.

Substitute parts are identified when equivalent electrical ratings, mechanical packaging, and regulatory certifications align with the original specification, ensuring direct functional replacement without circuit redesign.

Substiute Parts

37318000430

LittelfuseIn Stock: 113237318000430 Datasheet

Current PartRFQ

37318000410

Littelfuse Inc.In Stock: 183437318000410 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 37318000430 is determined by strict equivalence across the following critical parameters:

• Current Rating: 8 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package Style: Radial, Can, Vertical (exact match required)
• Breaking Capacity: 50 A at rated voltage (exact match required)
• Melting I²t: 30 (exact match required)
• Regulatory Compliance: cULus approval and ROHS3 compliance (exact match required)

The substitute part 37318000410 meets all these criteria, confirming functional and mechanical interchangeability within the TR5® 373 series.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 37318000430 and 37318000410 maintain active product status with full cULus regulatory approval and ROHS3 compliance. Selection between these parts is based on inventory availability and supply chain considerations rather than technical performance differences.

The 37318000430 carries 1036 pieces in current stock inventory, while the 37318000410 maintains 1773 pieces in stock. Both parts are manufactured by Littelfuse and belong to the TR5® 373 series, ensuring consistent quality and performance characteristics across production batches.

For applications requiring immediate component availability, the 37318000410 offers higher stock levels. For established supply chains or specific procurement requirements, the 37318000430 remains a direct equivalent option.

Frequently Asked Questions (FAQ)

Q: Can the 37318000410 be used as a direct replacement for the 37318000430 in existing designs?

A: Yes. Both parts are identical across all electrical ratings (8A, 250VAC), response characteristics (fast blow), mechanical packaging (radial, can, vertical through-hole), and regulatory certifications (cULus, ROHS3). No circuit modifications or PCB layout changes are required.

Q: Are there any differences in breaking capacity or melting I²t between these parts?

A: No. Both parts specify 50A breaking capacity at rated voltage and 30 melting I²t, ensuring equivalent protection performance in overcurrent conditions.

Q: Do both parts fit the same PCB footprint?

A: Yes. Both parts share identical physical dimensions of 0.335" diameter by 0.315" height (8.50mm x 8.00mm) and use radial, can-style vertical through-hole mounting, confirming mechanical interchangeability.

Q: What is the significance of the TR5® 373 series designation?

A: The TR5® 373 series identifies these parts as belonging to Littelfuse's established fast-blow fuse product line with standardized electrical and mechanical specifications. Both substitute parts maintain this series classification.

Q: Are there temperature or environmental limitations affecting substitution?

A: Both parts operate across the identical temperature range of -40°C to 85°C with equivalent DC cold resistance of 0.00736 Ohms, confirming functional equivalence across all specified operating conditions.