Littelfuse 37414000430 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37414000430 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 bulk packaging and maintains full RoHS3 compliance with CSA and cULus certifications. Substitute parts are identified when equivalent electrical ratings, mechanical dimensions, and mounting configurations are required for design flexibility, inventory optimization, or regional certification requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	37414000430
Manufacturer	Littelfuse Inc.
Current Rating	4 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Mounting Type	Through Hole
Package / Case	Radial, Can, Vertical
Size / Dimension	0.335" Dia x 0.315" H (8.50mm x 8.00mm)
Operating Temperature Range	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Product Status	Active

Substitute Part Grouping Explanation

Substitute parts for the 37414000430 are identified based on strict parametric equivalence across the following critical criteria:

Mandatory Matching Parameters:

Current Rating: 4 A
Voltage Rating (AC): 250 V
Response Time: Slow Blow
Mounting Type: Through Hole
Package / Case: Radial, Can, Vertical
Operating Temperature Range: -40°C ~ 85°C
RoHS3 Compliance: Required

Allowable Variations:

Series designation (TR5® 374, TR5® 372, TR5® 382, MSTU 250)
Breaking Capacity @ Rated Voltage (40 A to 100 A)
Melting I²t (36 to 126.4)
DC Cold Resistance (0.0129 to 0.017 Ohms)
Approval Agency certifications (CSA, cULus, CCC, cURus, PSE, SEMKO, VDE, KC, JET)
Packaging format (Bulk or Cut Tape)
Dimensional tolerance within radial can vertical configuration (8.50mm diameter, height 8.00mm to 8.50mm)

Substitutes are grouped by manufacturer and series to facilitate direct replacement while maintaining electrical and mechanical compatibility.

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage (V AC)	Response	Breaking Capacity (A)	Melting I²t	DC Resistance (Ω)	Size (mm)	Packaging
37414000430	Littelfuse Inc.	TR5® 374	4	250	Slow Blow	50	36	0.017	8.50 x 8.00	Bulk
37214000411	Littelfuse Inc.	TR5® 372	4	250	Slow Blow	40	126.4	0.0129	8.50 x 8.00	Bulk
37214000431	Littelfuse	TR5® 372	4	250	Slow Blow	40	126.4	0.0129	8.50 x 8.00	Bulk
37214000511	Littelfuse	TR5® 372	4	250	Slow Blow	40	126.4	0.0129	8.50 x 8.00	Bulk
38214000410	Littelfuse	TR5® 382	4	250	Slow Blow	100	72	0.0138	8.50 x 8.00	Bulk
0034.7321	SCHURTER Inc.	MSTU 250	4	250	Slow Blow	50	67.2	—	8.50 x 8.50	Cut Tape (CT)

Engineering Selection Recommendations

Littelfuse TR5® 372 Series (37214000411, 37214000431, 37214000511): These parts maintain identical electrical ratings and mounting specifications to the 37414000430. The TR5® 372 series offers expanded regional certifications including CCC, cURus, PSE, SEMKO, and VDE, providing broader compliance coverage for international applications. Breaking capacity is reduced to 40 A with increased melting I²t of 126.4, suitable for applications requiring extended thermal response characteristics.

Littelfuse TR5® 382 Series (38214000410): This substitute provides the highest breaking capacity at 100 A while maintaining all core electrical and mechanical parameters. The TR5® 382 series includes additional certifications (KC, PSE/JET) and is appropriate for applications requiring enhanced fault current handling capability.

SCHURTER MSTU 250 Series (0034.7321): This cross-manufacturer substitute from SCHURTER Inc. matches the 37414000430 in current, voltage, and response characteristics with equivalent 50 A breaking capacity. The MSTU 250 series is supplied in Cut Tape packaging and carries cULus certification. Dimensional height is 8.50mm compared to 8.00mm for Littelfuse variants, requiring verification of board layout clearance.

All substitute parts maintain active product status, RoHS3 compliance, and -40°C to 85°C operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can 37214000411, 37214000431, and 37214000511 be used interchangeably with 37414000430?

A: These Littelfuse TR5® 372 series parts are parametrically equivalent for core electrical specifications (4 A, 250 V, slow blow response). All three maintain identical dimensions (8.50mm x 8.00mm) and through-hole radial mounting. The primary differences are series designation and regional certifications. Substitution is valid where the expanded certification set (CCC, cURus, PSE, SEMKO, VDE) meets application requirements.

Q: What is the significance of breaking capacity differences (40 A, 50 A, 100 A)?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt without rupturing or creating hazardous conditions. The 37414000430 (50 A) and 0034.7321 (50 A) provide equivalent fault current handling. The TR5® 372 series (40 A) is suitable for lower fault current environments, while the TR5® 382 (100 A) accommodates higher fault current circuits. Selection depends on the circuit's maximum available fault current.

Q: Does the SCHURTER 0034.7321 require board layout modifications?

A: The SCHURTER MSTU 250 (0034.7321) has a height of 8.50mm compared to 8.00mm for Littelfuse variants. This 0.50mm difference must be verified against board clearance specifications, component spacing, and conformal coating requirements. Diameter remains identical at 8.50mm.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 Compliant status and are REACH Unaffected, meeting environmental regulatory requirements equivalent to the 37414000430.

Q: Which substitute offers the broadest regional certification coverage?

A: The Littelfuse TR5® 382 series (38214000410) provides the most comprehensive certification set, including CCC, cURus, KC, PSE/JET, SEMKO, and VDE, in addition to cULus. This makes it suitable for applications requiring multi-regional compliance.

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