Littelfuse TR5® 373 37308000430 Board Mount Fuse 800mA 250VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 37308000430 is an 800 mA, 250 V AC/DC board mount fuse with fast blow response time, designed for through-hole radial mounting in radial can vertical package configuration. This TR5® 373 series fuse is actively produced and widely used in power distribution and circuit protection applications. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical compatibility, and approved certifications to ensure direct interchangeability in circuit board designs.

Substiute Parts

37308000430

Littelfuse Inc.In Stock: 124037308000430 Datasheet

Current PartRFQ

37308000410

Littelfuse Inc.In Stock: 237337308000410 Datasheet

DirectRFQ

37008000410

Littelfuse Inc.In Stock: 153137008000410 Datasheet

Parametric EquivalentRFQ

37008000430

Littelfuse Inc.In Stock: 84737008000430 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 37308000430 are classified into two categories based on electrical and mechanical parameter alignment:

Direct Manufacturer Equivalent (37308000410): Identical current rating (800 mA), voltage rating (250 V AC), response time (Fast Blow), mounting type (Through Hole), package configuration (Radial, Can, Vertical), physical dimensions (0.335" Dia x 0.315" H), and breaking capacity (50A). Differs only in internal melting I²t specification (0.069 vs. 0.069) and approval agencies (CSA, cULus). This part is a direct pin-for-pin and functionally equivalent substitute.

Parametric Equivalent (37008000410, 37008000430): Both parts share identical current rating (800 mA), voltage rating (250 V AC), response time (Fast Blow), mounting type (Through Hole), package configuration (Radial, Can, Vertical), physical dimensions (0.335" Dia x 0.315" H), and breaking capacity (50A). These parts belong to the TR5® 370 series and feature different melting I²t values (0.12 vs. 0.069) and expanded approval agencies (CCC, cURus, SEMKO, VDE). Parametric equivalence is established through matching all critical electrical and mechanical parameters that determine circuit protection performance.

Parameter Comparison

Engineering Selection Recommendations

37308000410 (Direct Manufacturer Equivalent): This part is the primary substitute for 37308000430. Both parts carry identical electrical specifications, mechanical dimensions, and CSA/cULus certifications. Selection of 37308000410 is appropriate when the original part is unavailable and CSA/cULus compliance is required.

37008000410 and 37008000430 (Parametric Equivalents): These TR5® 370 series parts are functionally equivalent based on matching current rating, voltage rating, response time, mounting configuration, and physical dimensions. The melting I²t value of 0.12 (compared to 0.069 in the main part) indicates a different thermal response characteristic. These parts carry expanded certifications (CCC, cURus, SEMKO, VDE) and are suitable for applications requiring broader international compliance. Selection is appropriate when the application permits the alternative thermal response profile and expanded certifications are beneficial.

All substitute parts maintain active product status and ROHS3 compliance, ensuring long-term availability and environmental regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can 37308000410 be used as a direct replacement for 37308000430?

A: Yes. Both parts share identical current rating (800 mA), voltage rating (250 V AC), response time (Fast Blow), mounting type (Through Hole), package configuration (Radial, Can, Vertical), physical dimensions (0.335" Dia x 0.315" H), and breaking capacity (50A). The parts are pin-for-pin compatible and functionally equivalent.

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

A: The TR5® 373 series (37308000430, 37308000410) and TR5® 370 series (37008000410, 37008000430) differ in melting I²t specification and approval agencies. The 373 series has a melting I²t of 0.069 with CSA/cULus certifications. The 370 series has a melting I²t of 0.12 with CCC, cURus, SEMKO, and VDE certifications. Both series maintain identical electrical ratings and physical dimensions.

Q: Are the parametric equivalents (37008000410, 37008000430) suitable for all applications using 37308000430?

A: Parametric equivalents are suitable when the application permits the alternative melting I²t value (0.12 vs. 0.069) and when the expanded certifications (CCC, cURus, SEMKO, VDE) align with regional compliance requirements. The identical current rating, voltage rating, response time, and physical dimensions ensure mechanical and electrical compatibility.

Q: What does melting I²t represent?

A: Melting I²t is a thermal characteristic that defines the fuse's response to overcurrent conditions. A higher melting I²t value indicates a slower thermal response. Selection between parts with different melting I²t values depends on the specific circuit protection requirements and thermal environment of the application.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All parts listed (37308000430, 37308000410, 37008000410, 37008000430) are ROHS3 compliant and maintain active product status.

Q: What is the physical footprint compatibility?

A: All parts share identical physical dimensions of 0.335" Dia x 0.315" H (8.50mm x 8.00mm) in radial can vertical package configuration. All parts are through-hole mounted and occupy the same PCB footprint.