Littelfuse 37414000000 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37414000000 is a 4 A, 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 a breaking capacity of 50 A at rated voltage. Finding equivalent substitute parts may be necessary due to inventory availability, lead time requirements, or specific application compliance certifications.

Substiute Parts

37414000000

Littelfuse Inc.In Stock: 518837414000000 Datasheet

Current PartRFQ

37214000001

Littelfuse Inc.In Stock: 546337214000001 Datasheet

Parametric EquivalentRFQ

38214000000

Littelfuse Inc.In Stock: 1564138214000000 Datasheet

Parametric EquivalentRFQ

0034.7321

SCHURTER Inc.In Stock: 16460034.7321 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Littelfuse 37414000000 are qualified based on the following critical parameters that must match or exceed the main part specifications:

Mandatory Matching Parameters:

• Current Rating: 4 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Can, Vertical (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (minimum requirement)
• RoHS Status: ROHS3 Compliant (minimum requirement)

Variable Parameters (May Differ):

• Breaking Capacity @ Rated Voltage (may be equal or higher)
• Melting I²t (may vary within application tolerance)
• DC Cold Resistance (may vary within application tolerance)
• Manufacturer and Series designation
• Approval Agency certifications (may include additional certifications)
• Physical dimensions (minor variations acceptable within 0.335" Dia specification)

Three substitute parts meet these criteria: Littelfuse 37214000001 (TR5® 372 series), Littelfuse 38214000000 (TR5® 382 series), and SCHURTER 0034.7321 (MSTU 250 series).

Parameter Comparison

Engineering Selection Recommendations

Littelfuse 37214000001 (TR5® 372 Series) This substitute is electrically compatible with the main part across all critical parameters. The breaking capacity of 40 A is lower than the main part's 50 A specification. The melting I²t value of 126.4 differs significantly from the main part's 36. This part carries expanded approval certifications including CCC, cURus, PSE, SEMKO, and VDE, providing broader regional compliance coverage. Inventory availability is comparable to the main part at 5382 pieces.

Littelfuse 38214000000 (TR5® 382 Series) This substitute meets all critical electrical and mechanical parameters with a breaking capacity of 100 A, which exceeds the main part's 50 A specification. The melting I²t value of 72 is higher than the main part's 36. This part carries the most comprehensive approval certifications including CCC, cURus, KC, PSE/JET, SEMKO, and VDE. Inventory availability is highest among all substitutes at 15542 pieces, supporting extended lead time requirements.

SCHURTER 0034.7321 (MSTU 250 Series) This substitute is manufactured by a different supplier and meets all critical electrical parameters. The physical height dimension is 0.335" H (8.50mm x 8.50mm) compared to the main part's 0.315" H (8.50mm x 8.00mm), representing a 0.020" increase in vertical height. The breaking capacity of 50 A matches the main part exactly. Approval certification is limited to cULus. Inventory availability is lowest at 1542 pieces.

Frequently Asked Questions (FAQ)

Q: Can I use Littelfuse 37214000001 as a direct replacement for 37414000000? A: The 37214000001 is electrically compatible across current rating, voltage, response time, and mounting configuration. However, the breaking capacity is 40 A versus 50 A on the main part, and the melting I²t differs significantly at 126.4 versus 36. Application-specific circuit protection requirements must be evaluated before substitution.

Q: What is the difference between the three Littelfuse substitutes? A: All three Littelfuse parts (37414000000, 37214000001, and 38214000000) are from the TR5® series with identical electrical ratings and mounting specifications. They differ in breaking capacity (50 A, 40 A, and 100 A respectively), melting I²t characteristics, and approval certifications. The 38214000000 offers the highest breaking capacity and most comprehensive certifications.

Q: Is the SCHURTER 0034.7321 physically compatible with the main part? A: The SCHURTER part has a slightly larger vertical dimension of 0.335" H compared to the main part's 0.315" H. This 0.020" difference must be evaluated against available PCB clearance and mechanical constraints in the application. The radial diameter of 0.335" matches the main part specification.

Q: Which substitute has the best inventory availability? A: Littelfuse 38214000000 has the highest inventory at 15542 pieces, followed by Littelfuse 37214000001 at 5382 pieces. The main part 37414000000 has 5100 pieces in stock, and SCHURTER 0034.7321 has the lowest availability at 1542 pieces.

Q: Do all substitutes meet RoHS3 compliance? A: Yes, all four parts (main and three substitutes) are ROHS3 Compliant and REACH Unaffected, meeting current environmental regulatory requirements.

Q: What approval certifications should I consider for regional compliance? A: The main part carries CSA and cULus certifications. Littelfuse 37214000001 and 38214000000 provide expanded certifications including CCC, PSE, SEMKO, and VDE for broader regional markets. SCHURTER 0034.7321 is limited to cULus certification. Select based on target market requirements.