Littelfuse TR5® 373 37314000430 Board Mount Fuse 4A 250VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 37314000430 is a 4 A, 250 V AC/DC board mount fuse with fast blow response characteristics, designed for through-hole radial mounting in vertical orientation. This TR5® 373 series fuse is actively produced and widely used in industrial and consumer electronics applications requiring overcurrent protection. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits selection from alternative series within the same electrical and mechanical specifications.

Substiute Parts

37314000430

Littelfuse Inc.In Stock: 109337314000430 Datasheet

Current PartRFQ

37314000410

Littelfuse Inc.In Stock: 237537314000410 Datasheet

DirectRFQ

37014000410

Littelfuse Inc.In Stock: 3210737014000410 Datasheet

Parametric EquivalentRFQ

37014000430

Littelfuse Inc.In Stock: 128237014000430 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 37314000430 is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 4 A
• Voltage Rating (AC): 250 V
• Response Time: Fast Blow
• Fuse Type: Board Mount (Cartridge Style Excluded)
• Mounting Type: Through Hole
• Package / Case: Radial, Can, Vertical
• Size / Dimension: 0.335" Dia x 0.315" H (8.50mm x 8.00mm)
• Operating Temperature Range: -40°C ~ 85°C

Allowable Variation Parameters:

• Breaking Capacity @ Rated Voltage: 40 A to 50 A
• Melting I²t: 3.5 to 6.7
• Approval Agencies: May differ while maintaining regional compliance requirements
• Series designation: TR5® 373 or TR5® 370

All identified substitute parts meet these criteria and are manufactured by Littelfuse Inc. in active production status.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitute (37314000410): The 37314000410 is a direct substitute for the 37314000430. Both parts belong to the TR5® 373 series, share identical electrical and mechanical specifications, and carry the same approval certifications (CSA, cULus). Selection between these two parts is determined by inventory availability and supply chain considerations. The 37314000410 maintains 50 A breaking capacity and 3.5 melting I²t, matching the main part exactly.

Parametric Equivalents (37014000410 and 37014000430): The TR5® 370 series parts (37014000410 and 37014000430) are parametric equivalents that satisfy all mandatory electrical and mechanical requirements. These parts differ in breaking capacity (40 A versus 50 A) and melting I²t (6.7 versus 3.5). The TR5® 370 series carries expanded approval certifications (CCC, cURus, PSE, SEMKO, VDE) compared to the TR5® 373 series. Selection of TR5® 370 parts is appropriate when regional compliance requirements align with these certifications and when the lower breaking capacity and higher melting I²t are acceptable for the application.

All substitute parts are actively produced by Littelfuse Inc. and maintain ROHS3 compliance and REACH unaffected status.

Frequently Asked Questions (FAQ)

Q: Can 37314000410 be used as a direct replacement for 37314000430? A: Yes. Both parts are TR5® 373 series fuses with identical current rating (4 A), voltage rating (250 V AC), response time (fast blow), mounting configuration (through-hole radial), physical dimensions (0.335" Dia x 0.315" H), and approval certifications (CSA, cULus). They are functionally interchangeable.

Q: What is the difference between TR5® 373 and TR5® 370 series fuses? A: The TR5® 373 series (37314000430, 37314000410) provides 50 A breaking capacity and 3.5 melting I²t with CSA and cULus certifications. The TR5® 370 series (37014000410, 37014000430) provides 40 A breaking capacity and 6.7 melting I²t with expanded certifications including CCC, cURus, PSE, SEMKO, and VDE. Both series maintain identical current rating, voltage rating, response time, and physical dimensions.

Q: Can TR5® 370 series parts replace TR5® 373 series parts? A: TR5® 370 parts meet all mandatory electrical and mechanical specifications for substitution. However, the lower breaking capacity (40 A versus 50 A) and higher melting I²t (6.7 versus 3.5) represent parametric differences. Selection depends on application requirements and whether the TR5® 370 certifications satisfy regional compliance needs.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All identified substitute parts (37314000410, 37014000410, 37014000430) are ROHS3 compliant and REACH unaffected, matching the environmental compliance status of the main part 37314000430.

Q: What determines whether a fuse can substitute for the 37314000430? A: Substitution requires matching current rating (4 A), voltage rating (250 V AC), response time (fast blow), fuse type (board mount), mounting type (through-hole), package configuration (radial, can, vertical), physical dimensions (0.335" Dia x 0.315" H), and operating temperature range (-40°C ~ 85°C). Breaking capacity and melting I²t may vary within specified ranges, and approval certifications may differ based on regional requirements.

Q: What is the inventory status of substitute parts? A: The 37314000410 has 2287 pieces in stock. The 37014000410 has 32066 pieces in stock. The 37014000430 has 1253 pieces in stock. All parts are new original stock from Littelfuse Inc.