Littelfuse 37004000430 Equivalent & Substitute Parts

Part Overview

The Littelfuse 37004000430 is a 400 mA, 250 V AC/DC board mount fuse with fast blow response time, designed for through hole radial mounting in vertical orientation. This TR5® 370 series fuse is an active product with full compliance certifications (CCC, cURus, SEMKO, VDE) and ROHS3 compliance. Substitute parts are identified to provide alternative sourcing options when the primary part number is unavailable or when packaging requirements differ.

Key Parameters

Parameter	Specification
Current Rating	400 mA
Voltage Rating (AC)	250 V
Response Time	Fast Blow
Mounting Type	Through Hole
Package / Case	Radial, Can, Vertical
Fuse Type	Board Mount (Cartridge Style Excluded)
Operating Temperature Range	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 37004000430 is determined by the following critical parameters:

Current Rating: 400 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Radial, Can, Vertical (exact match required)
Response Time: Fast Blow (exact match required)
Operating Temperature Range: -40°C ~ 85°C (exact match required)
RoHS Compliance: ROHS3 Compliant (exact match required)

All identified substitute parts meet these core electrical and mechanical parameters. Variations in Breaking Capacity, Melting I²t, physical dimensions, and packaging format (Bulk vs. Cut Tape) do not disqualify substitution when the above criteria are satisfied.

Parameter Comparison

Parameter	37004000430 (Littelfuse)	37004000410 (Littelfuse)	0034.6010 (SCHURTER)	0034.6070 (SCHURTER)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	SCHURTER Inc.	SCHURTER Inc.
Current Rating (Amps)	400 mA	400 mA	400 mA	400 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical
Fuse Type	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Breaking Capacity @ Rated Voltage	50A	50A	35A	35A
Melting I²t	0.025	0.025	0.044	0.044
Size / Dimension	0.335" Dia x 0.315" H (8.50mm x 8.00mm)	0.335" Dia x 0.315" H (8.50mm x 8.00mm)	0.335" Dia x 0.335" H (8.50mm x 8.50mm)	0.335" Dia x 0.335" H (8.50mm x 8.50mm)
Packaging	Bulk	Bulk	Bulk	Cut Tape (CT)
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All four parts listed are active products with full compliance certifications. Selection between the Littelfuse 37004000430 and its substitutes should be based on the following factors:

Littelfuse 37004000430 vs. Littelfuse 37004000410: Both parts are identical in electrical and mechanical specifications, series designation (TR5® 370), and compliance certifications. The primary difference is packaging format (Bulk) and inventory availability. Part 37004000410 offers higher stock levels (2213 Pcs vs. 831 Pcs).

Littelfuse parts vs. SCHURTER 0034.6010 and 0034.6070: The SCHURTER MSF 250 series parts meet all core substitution criteria but differ in Breaking Capacity (35A vs. 50A), Melting I²t (0.044 vs. 0.025), and physical height (8.50mm vs. 8.00mm). These parts carry CCC, cURus, and VDE certifications (SEMKO certification not listed). The SCHURTER parts are suitable substitutes where the lower Breaking Capacity and higher Melting I²t are acceptable for the application.

Packaging Consideration: Part 0034.6070 is supplied in Cut Tape (CT) format, while 37004000430, 37004000410, and 0034.6010 are supplied in Bulk packaging.

Frequently Asked Questions (FAQ)

Q: Can Littelfuse 37004000410 be used as a direct replacement for 37004000430?

A: Yes. Both parts share identical electrical ratings (400 mA, 250 V AC), response time (Fast Blow), mounting configuration (Through Hole Radial, Can, Vertical), operating temperature range (-40°C ~ 85°C), and compliance certifications. They are functionally equivalent.

Q: What are the key differences between Littelfuse and SCHURTER substitute parts?

A: The SCHURTER MSF 250 series (0034.6010 and 0034.6070) maintain the same current rating, voltage rating, response time, and mounting type. However, they have a lower Breaking Capacity (35A vs. 50A), higher Melting I²t (0.044 vs. 0.025), and slightly taller physical dimensions (8.50mm vs. 8.00mm height). SCHURTER parts do not carry SEMKO certification.

Q: Are the physical dimension differences between Littelfuse and SCHURTER parts significant?

A: The height difference is 0.5mm (8.50mm vs. 8.00mm). The diameter remains identical at 0.335" (8.50mm). Verify PCB layout and clearance requirements before substituting SCHURTER parts for Littelfuse parts.

Q: What is the difference between Bulk and Cut Tape packaging?

A: Bulk packaging (37004000430, 37004000410, 0034.6010) supplies loose components. Cut Tape packaging (0034.6070) supplies components on carrier tape in specified quantities. Selection depends on assembly process requirements and order quantity.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All four parts listed are ROHS3 compliant and REACH unaffected.

Q: Can I use SCHURTER 0034.6010 or 0034.6070 if my circuit requires 50A Breaking Capacity?

A: No. The SCHURTER parts have a Breaking Capacity of 35A. If 50A Breaking Capacity is a circuit requirement, use Littelfuse 37004000430 or 37004000410.

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