Littelfuse 37411000000 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37411000000 is a 1 A, 250 V AC/DC board mount fuse with radial, can-style vertical packaging. This through-hole component is part of the TR5® 374 series and is actively manufactured. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits selection from qualified alternatives that maintain electrical and mechanical compatibility within specified parameters.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating (AC)	250 V
Fuse Type	Board Mount (Cartridge Style Excluded)
Response Time	Slow Blow
Package / Case	Radial, Can, Vertical
Mounting Type	Through Hole
Operating Temperature Range	-40°C ~ 85°C
Size / Dimension	0.335" Dia x 0.315" H (8.50mm x 8.00mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (1 A), voltage rating (250 V AC), fuse type (board mount, radial can style), response time (slow blow), mounting method (through hole), and operating temperature range (-40°C ~ 85°C). All identified substitutes maintain these core electrical and mechanical specifications. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agency certifications do not disqualify substitution when the primary protective function parameters remain identical.

Parameter Comparison

Parameter	37411000000 (Littelfuse TR5® 374)	37211000001 (Littelfuse TR5® 372)	38211000000 (Littelfuse TR5® 382)	0034.7315 (SCHURTER MSTU 250)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	SCHURTER Inc.
Current Rating (Amps)	1 A	1 A	1 A	1 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
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 0.315" H (8.50mm x 8.00mm)	0.335" Dia x 0.335" H (8.50mm x 8.50mm)
Breaking Capacity @ Rated Voltage	50 A	35 A	100 A	50 A
Melting I²t	2.1	7.5	4.85	6.85
DC Cold Resistance	0.105 Ohms	0.079 Ohms	0.0625 Ohms	Not specified
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All identified substitutes maintain active product status and ROHS3 compliance. The three Littelfuse alternatives (37211000001, 38211000000) are parametric equivalents within the same manufacturer ecosystem, differing in series designation and secondary performance characteristics. The SCHURTER 0034.7315 is a direct cross-manufacturer substitute with identical primary electrical specifications and cULus approval. Selection among these options depends on design requirements for breaking capacity and thermal performance characteristics, as well as approval agency certifications required by the end application. All parts are suitable for through-hole PCB assembly in circuits requiring 1 A, 250 V AC protection with slow-blow response.

Frequently Asked Questions (FAQ)

Q: Can 37211000001 replace 37411000000 in my circuit? A: Yes. Both parts share identical current rating (1 A), voltage rating (250 V AC), response time (slow blow), package style (radial can vertical), and mounting method (through hole). The 37211000001 has a lower breaking capacity (35 A vs. 50 A) and different melting I²t value (7.5 vs. 2.1), which may affect performance in high-fault-current environments.

Q: What is the difference between the Littelfuse and SCHURTER options? A: All three Littelfuse parts (37411000000, 37211000001, 38211000000) are from the same manufacturer with identical electrical ratings. The SCHURTER 0034.7315 is a cross-manufacturer equivalent with the same electrical specifications but different approval certifications (cULus only vs. multiple certifications on Littelfuse parts). The SCHURTER part has a slightly larger height dimension (0.335" vs. 0.315").

Q: Are there any dimensional compatibility issues? A: The SCHURTER 0034.7315 has a height of 0.335" compared to 0.315" for the Littelfuse parts. All other dimensions (0.335" diameter) are identical. Verify PCB clearance and component spacing before substitution.

Q: Which substitute has the highest breaking capacity? A: The Littelfuse 38211000000 has a breaking capacity of 100 A, compared to 50 A for the 37411000000 and SCHURTER 0034.7315, and 35 A for the 37211000001.

Q: Do all substitutes have the same approval certifications? A: No. The 37411000000 carries CSA and cULus approvals. The 37211000001 has CCC, cURus, PSE, SEMKO, and VDE approvals. The 38211000000 has CCC, cURus, KC, PSE/JET, SEMKO, and VDE approvals. The SCHURTER 0034.7315 has cULus approval only. Select based on your application's regulatory requirements.

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