Littelfuse TR5® 373 37312000430 Board Mount Fuse 2A 250VAC Equivalent & Substitute Parts

Part Overview

The Littelfuse 37312000430 is a 2 A, 250 V AC/DC board mount fuse with fast blow response time, designed for through-hole radial mounting in vertical orientation. This component is classified as active product status and is manufactured to CSA and cULus approval standards. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical form factors, and thermal characteristics that permit direct functional replacement in circuit applications.

Substiute Parts

37312000430

Littelfuse Inc.In Stock: 91537312000430 Datasheet

Current PartRFQ

37312000410

Littelfuse Inc.In Stock: 260037312000410 Datasheet

DirectRFQ

37012000410

Littelfuse Inc.In Stock: 292937012000410 Datasheet

Parametric EquivalentRFQ

37012000430

Littelfuse Inc.In Stock: 82037012000430 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 37312000430 are classified into two categories based on allowed electrical and mechanical parameters:

Direct Manufacturer Equivalent (37312000410): Identical electrical ratings (2 A, 250 V AC), matching response time (Fast Blow), identical mechanical form factor (Radial, Can, Vertical), and equivalent thermal characteristics (Melting I²t: 0.63). Approval agencies include CSA and cULus. This part is a direct pin-for-pin and functional replacement.

Parametric Equivalents (37012000410, 37012000430): These parts share identical electrical ratings (2 A, 250 V AC), matching response time (Fast Blow), identical mechanical form factor (Radial, Can, Vertical), and equivalent operating temperature range (-40°C ~ 85°C). Both are from the TR5® 370 series. The key difference is the Melting I²t value (0.98 versus 0.63 for the main part), which represents a higher thermal energy absorption capacity. Approval agencies differ (CCC, cURus, PSE, SEMKO, VDE for the 370 series versus CSA, cULus for the 373 series).

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement: Part 37312000410 is the primary substitute for 37312000430. Both parts carry identical electrical specifications, thermal characteristics (Melting I²t: 0.63), and approval certifications (CSA, cULus). This part maintains full functional and compliance equivalence.

For Alternative Selection: Parts 37012000410 and 37012000430 from the TR5® 370 series are parametric equivalents that satisfy the core electrical and mechanical requirements (2 A, 250 V AC, Fast Blow, Radial Can Vertical form factor). The higher Melting I²t value (0.98) indicates increased thermal energy absorption capacity. These parts carry different approval certifications (CCC, cURus, PSE, SEMKO, VDE) and are suitable for applications where regulatory compliance aligns with these standards. Selection between 37012000410 and 37012000430 depends on specific circuit design requirements and approval agency mandates for the end application.

Frequently Asked Questions (FAQ)

Q: Can 37312000410 be used as a direct replacement for 37312000430? A: Yes. Both parts share identical current rating (2 A), voltage rating (250 V AC), response time (Fast Blow), mechanical form factor (Radial, Can, Vertical), breaking capacity (50 A), and thermal characteristics (Melting I²t: 0.63). Approval certifications are equivalent (CSA, cULus).

Q: What is the difference between the TR5® 373 series (37312000430, 37312000410) and the TR5® 370 series (37012000410, 37012000430)? A: The primary electrical and mechanical parameters are identical. The key difference is the Melting I²t value: TR5® 373 series has 0.63, while TR5® 370 series has 0.98. Additionally, approval certifications differ: TR5® 373 carries CSA and cULus approvals, while TR5® 370 carries CCC, cURus, PSE, SEMKO, and VDE approvals.

Q: Are the TR5® 370 series parts (37012000410, 37012000430) suitable replacements for the 37312000430? A: These parts are parametric equivalents that satisfy core electrical ratings (2 A, 250 V AC), response time (Fast Blow), and mechanical form factor requirements. The higher Melting I²t value (0.98) provides increased thermal energy absorption. Selection depends on whether the application's regulatory compliance requirements align with the TR5® 370 series approval certifications (CCC, cURus, PSE, SEMKO, VDE).

Q: What does the Melting I²t parameter indicate? A: Melting I²t represents the thermal energy (in ampere-squared seconds) required to melt the fuse element. A higher value indicates greater thermal energy absorption capacity before the fuse element melts and opens the circuit.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All parts listed (37312000430, 37312000410, 37012000410, 37012000430) are ROHS3 compliant.

Q: Do all substitute parts have the same physical dimensions? A: Yes. All parts share identical dimensions: 0.335" Dia x 0.315" H (8.50mm x 8.00mm), ensuring mechanical compatibility in through-hole radial mounting applications.