Littelfuse 37012000430 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37012000430 is a 2 A, 250 V AC/DC board mount fuse with fast blow response characteristics, designed for through-hole radial mounting in radial can vertical package configuration. This component is classified as Active product status with full compliance to international safety standards including CCC, cURus, PSE, SEMKO, and VDE certifications. Substitute parts are identified to address inventory availability, alternative sourcing requirements, or specific application constraints while maintaining electrical and mechanical compatibility within defined parameter tolerances.

Substiute Parts

37012000430

Littelfuse Inc.In Stock: 82037012000430 Datasheet

Current PartRFQ

37012000410

Littelfuse Inc.In Stock: 292937012000410 Datasheet

DirectRFQ

37312000410

Littelfuse Inc.In Stock: 260037312000410 Datasheet

Parametric EquivalentRFQ

0034.6017

SCHURTER Inc.In Stock: 40050034.6017 Datasheet

DirectRFQ

0034.6077

SCHURTER Inc.In Stock: 40120034.6077 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Littelfuse 37012000430 are classified into two categories based on parametric equivalence:

Direct Manufacturer Equivalents (Littelfuse Series): Parts 37012000410 and 37312000410 maintain identical electrical ratings (2 A, 250 V AC/DC, Fast Blow response) and mechanical form factor (0.335" Dia x 0.315" H radial can vertical). These parts differ in series designation (TR5® 370 versus TR5® 373) and secondary parameters such as melting I²t and approval agency certifications, but satisfy the core substitution criteria of current rating, voltage rating, response time, mounting type, and package configuration.

Cross-Manufacturer Equivalents (SCHURTER Series): Parts 0034.6017 and 0034.6077 from SCHURTER Inc. provide parametric equivalence across all primary electrical specifications (2 A, 250 V AC/DC, Fast Blow response) and mounting configuration (Through Hole, Radial, Can, Vertical). These parts are differentiated by packaging format (Bulk versus Cut Tape) and minor dimensional variance (0.335" Dia x 0.335" H versus 0.335" Dia x 0.315" H), with breaking capacity rated at 35 A versus 50 A for Littelfuse parts.

Substitution Criteria: All substitute parts maintain equivalence across the following mandatory parameters: current rating (2 A), voltage rating (250 V AC), response time (fast blow), mounting type (through hole), fuse type (board mount, cartridge style excluded), package configuration (radial can vertical), and operating temperature range (-40°C ~ 85°C).

Parameter Comparison

Engineering Selection Recommendations

Littelfuse 37012000410: Direct manufacturer equivalent with identical electrical characteristics and mechanical form factor. Maintains full compliance with CCC, cURus, PSE, SEMKO, and VDE certifications. Suitable for direct substitution in applications requiring Littelfuse TR5® 370 series components. Higher inventory availability (2914 Pcs) supports supply chain continuity.

Littelfuse 37312000410: Parametric equivalent within TR5® 373 series designation. Maintains core electrical ratings and mechanical compatibility. Certifications limited to CSA and cULus standards. Melting I²t specification (0.63) differs from main part (0.98), indicating different thermal response characteristics. Selection requires confirmation of application thermal requirements and certification scope compatibility.

SCHURTER 0034.6017 (Bulk Packaging): Cross-manufacturer equivalent with full electrical and mechanical compatibility across primary parameters. Certifications include CCC, cURus, and VDE. Breaking capacity rated at 35 A versus 50 A for Littelfuse parts. Melting I²t specification (1.3) indicates slower thermal response compared to main part (0.98). Dimensional height variance (0.335" H versus 0.315" H) requires PCB layout clearance verification. Bulk packaging format supports high-volume applications.

SCHURTER 0034.6077 (Cut Tape Packaging): Identical electrical and mechanical specifications to 0034.6017 with alternative Cut Tape packaging format. Suitable for automated assembly processes and lower-volume production runs. Same certification scope and thermal characteristics apply.

Frequently Asked Questions (FAQ)

Q: Can 37012000410 be used as a direct replacement for 37012000430? A: Yes. Both parts maintain identical current rating (2 A), voltage rating (250 V AC), response time (fast blow), mounting type (through hole), package configuration (radial can vertical), and physical dimensions (0.335" Dia x 0.315" H). Electrical and mechanical compatibility is confirmed.

Q: What is the difference between Littelfuse TR5® 370 and TR5® 373 series? A: Series designation indicates product line classification. Both maintain equivalent electrical ratings and mechanical form factors. TR5® 373 (part 37312000410) carries different approval certifications (CSA, cULus) and melting I²t specification (0.63 versus 0.98), affecting thermal response characteristics.

Q: Are SCHURTER parts 0034.6017 and 0034.6077 interchangeable? A: Yes, electrically and mechanically. Both parts are identical except for packaging format: 0034.6017 is supplied in Bulk packaging, while 0034.6077 is supplied in Cut Tape (CT) format. Selection depends on assembly process requirements and inventory management preferences.

Q: What is the significance of the 0.02" height difference between Littelfuse and SCHURTER parts? A: SCHURTER parts (0034.6017 and 0034.6077) measure 0.335" Dia x 0.335" H, while Littelfuse parts measure 0.335" Dia x 0.315" H. This 0.02" height variance requires verification of PCB layout clearance and component spacing to ensure mechanical fit within the target application.

Q: Why do SCHURTER parts have lower breaking capacity (35 A versus 50 A)? A: Breaking capacity specification reflects the maximum fault current the fuse can safely interrupt at rated voltage. SCHURTER MSF 250 series is rated at 35 A breaking capacity, while Littelfuse TR5® series is rated at 50 A. Application requirements determine whether this difference impacts component selection.

Q: What does melting I²t indicate, and why does it vary across substitute parts? A: Melting I²t is a thermal characteristic indicating the energy required to melt the fuse element. Littelfuse 37012000430 specifies 0.98, Littelfuse 37312000410 specifies 0.63, and SCHURTER parts specify 1.3. Lower values indicate faster thermal response; higher values indicate slower response. Application thermal environment and circuit protection requirements determine acceptable ranges.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts (37012000410, 37312000410, 0034.6017, and 0034.6077) maintain ROHS3 compliance status, consistent with the main part 37012000430.

Q: Which substitute part has the highest inventory availability? A: Littelfuse 37012000410 has the highest inventory availability at 2914 Pcs New Original In Stock, compared to 37012000430 (767 Pcs), 37312000410 (2502 Pcs), 0034.6017 (3901 Pcs), and 0034.6077 (3908 Pcs).