Littelfuse 37408000430 Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 37408000430 is an 800 mA, 250 V AC/DC board mount fuse with slow blow response characteristics, designed for through hole radial mounting in TR5® 374 series applications. This active product is manufactured in radial, can, vertical package configuration with CSA and cULus approval certifications. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity across compatible electrical and mechanical specifications.

Substiute Parts

37408000430

Littelfuse Inc.In Stock: 69137408000430 Datasheet

Current PartRFQ

37408000410

Littelfuse Inc.In Stock: 197037408000410 Datasheet

DirectRFQ

37208000411

Littelfuse Inc.In Stock: 879837208000411 Datasheet

Parametric EquivalentRFQ

37208000431

Littelfuse Inc.In Stock: 126537208000431 Datasheet

Parametric EquivalentRFQ

0034.7314

SCHURTER Inc.In Stock: 17920034.7314 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Littelfuse 37408000430 are classified into two categories based on electrical and mechanical parameter alignment:

Direct Substitutes (Identical Electrical & Mechanical Parameters): Parts that match all critical parameters including current rating (800 mA), voltage rating (250 V AC), response time (Slow Blow), package configuration (Radial, Can, Vertical), and physical dimensions (0.335" Dia x 0.315" H). These parts are interchangeable without design modification.

Parametric Equivalents (Matched Electrical Parameters, Variant Specifications): Parts that maintain identical current rating (800 mA), voltage rating (250 V AC), response time (Slow Blow), mounting type (Through Hole), and package configuration (Radial, Can, Vertical), but differ in breaking capacity, melting I²t, or approval certifications. These parts are functionally equivalent for the specified electrical load but may require verification for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution (No Design Changes Required): Part 37408000410 (Littelfuse Inc., TR5® 374 series) is a direct substitute for 37408000430. Both parts share identical electrical specifications (800 mA, 250 V AC, Slow Blow response), mechanical configuration (Radial, Can, Vertical, 0.335" Dia x 0.315" H), breaking capacity (50A), and approval certifications (CSA, cULus). This part is available in higher inventory (1949 Pcs).

For Parametric Equivalence (Application-Dependent Selection): Parts 37208000411 and 37208000431 (Littelfuse Inc., TR5® 372 series) maintain identical current and voltage ratings with matching physical dimensions and mounting configuration. These parts differ in breaking capacity (35A versus 50A) and melting I²t characteristics (5.76 versus 0.98). Selection depends on circuit protection requirements and fault current levels in the target application. Both parts carry expanded approval certifications (CCC, cURus, SEMKO, VDE) and are available in higher inventory quantities.

For Cross-Manufacturer Substitution: Part 0034.7314 (SCHURTER Inc., MSTU 250 series) provides electrical equivalence (800 mA, 250 V AC, Slow Blow) with matching breaking capacity (50A) and cULus certification. Physical dimensions differ slightly (0.335" Dia x 0.335" H versus 0.335" Dia x 0.315" H), requiring verification of PCB layout and mounting clearance. This part is available in Cut Tape packaging and moderate inventory (1717 Pcs).

Frequently Asked Questions (FAQ)

Q: Can 37408000410 replace 37408000430 without PCB modification? A: Yes. Part 37408000410 is a direct substitute with identical electrical specifications, mechanical configuration, physical dimensions, and approval certifications. No design changes are required.

Q: What is the difference between TR5® 374 and TR5® 372 series fuses? A: Both series share the same current rating (800 mA) and voltage rating (250 V AC). The TR5® 374 series (37408000430, 37408000410) provides 50A breaking capacity and 0.98 melting I²t. The TR5® 372 series (37208000411, 37208000431) provides 35A breaking capacity and 5.76 melting I²t. Series selection depends on circuit fault current levels and protection coordination requirements.

Q: Are the Littelfuse TR5® 372 parts (37208000411, 37208000431) suitable for my application? A: Both parts maintain the same current and voltage ratings as the original part. The reduced breaking capacity (35A) and increased melting I²t (5.76) indicate different thermal and fault current characteristics. Compatibility depends on your circuit's maximum fault current and protection requirements.

Q: Can I use SCHURTER 0034.7314 as a substitute? A: Part 0034.7314 provides electrical equivalence (800 mA, 250 V AC, Slow Blow, 50A breaking capacity) and cULus certification. The physical dimensions differ slightly (height 0.335" versus 0.315"). Verify PCB layout and mounting clearance before substitution.

Q: What packaging formats are available for these substitute parts? A: Littelfuse parts (37408000430, 37408000410, 37208000411, 37208000431) are supplied in Bulk packaging. SCHURTER part 0034.7314 is supplied in Cut Tape (CT) packaging. Packaging selection affects procurement, handling, and assembly processes.

Q: Which substitute part has the highest inventory availability? A: Part 37208000411 (Littelfuse Inc., TR5® 372 series) has the highest inventory at 8,721 Pcs. This part is a parametric equivalent with reduced breaking capacity (35A) and increased melting I²t (5.76).