Littelfuse 37412500430 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37412500430 is a 2.5 A, 250 V AC/DC board mount fuse with slow blow response characteristics, designed for through-hole radial mounting in radial can vertical package configuration. This TR5® 374 series fuse is actively produced and widely used in power distribution and circuit protection applications. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical compatibility, and functional performance parameters to ensure seamless integration in existing designs or procurement scenarios.

Key Parameters

Parameter	Value
Current Rating	2.5 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

Substitute Part Grouping Explanation

Substitute parts for the 37412500430 are classified based on strict electrical and mechanical parameter alignment:

Primary Substitution Criteria:

Current Rating: 2.5 A (exact match required)
Voltage Rating: 250 V AC (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: -40°C ~ 85°C (exact match required)

Allowable Parameter Variations:

Breaking Capacity @ Rated Voltage: May vary (35A, 50A, or 100A)
Melting I²t: May vary (14, 29.69, 35, or 40.9)
DC Cold Resistance: May vary (0.0215 to 0.03 Ohms)
Approval Agencies: May differ based on regional requirements
Series designation: May differ (TR5® 372, TR5® 374, TR5® 382, MSTU 250)
Manufacturer: Littelfuse Inc., Littelfuse, or SCHURTER Inc.

Parts meeting all primary criteria are considered direct substitutes. Dimensional tolerance of ±0.005" is acceptable for radial can vertical packages.

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage (V AC)	Response	Breaking Capacity (A)	Melting I²t	DC Resistance (Ω)	Size (mm)	Approval Agencies
37412500430	Littelfuse Inc.	TR5® 374	2.5	250	Slow Blow	50	14	0.03	8.50 x 8.00	CSA, cULus
37212500411	Littelfuse Inc.	TR5® 372	2.5	250	Slow Blow	35	35	0.022	8.50 x 8.00	CCC, cURus, PSE, SEMKO, VDE
37212500431	Littelfuse Inc.	TR5® 372	2.5	250	Slow Blow	35	35	0.022	8.50 x 8.00	CCC, cURus, PSE, SEMKO, VDE
37412500410	Littelfuse	TR5® 374	2.5	250	Slow Blow	50	14	0.03	8.50 x 8.00	CSA, cULus
38212500410	Littelfuse Inc.	TR5® 382	2.5	250	Slow Blow	100	29.69	0.0215	8.50 x 8.00	CCC, cURus, KC, PSE/JET, SEMKO, VDE
0034.7119	SCHURTER Inc.	MSTU 250	2.5	250	Slow Blow	50	40.9	Not specified	8.50 x 8.50	cULus
0034.7319	SCHURTER Inc.	MSTU 250	2.5	250	Slow Blow	50	40.9	Not specified	8.50 x 8.50	cULus

Engineering Selection Recommendations

Littelfuse TR5® 374 Series (37412500430, 37412500410): These parts share identical electrical and mechanical specifications with 50 A breaking capacity and 14 melting I²t. Both carry CSA and cULus certifications. Selection between these two is based on inventory availability and procurement source preference, as they are functionally equivalent.

Littelfuse TR5® 372 Series (37212500411, 37212500431): These parts provide equivalent electrical performance with reduced breaking capacity (35 A) and higher melting I²t (35). They carry expanded regional certifications including CCC, PSE, SEMKO, and VDE, making them suitable for applications requiring broader compliance coverage. DC cold resistance is lower at 0.022 Ohms compared to 0.03 Ohms in the TR5® 374 series.

Littelfuse TR5® 382 Series (38212500410): This part offers the highest breaking capacity (100 A) and intermediate melting I²t (29.69), with the most comprehensive approval agency coverage including KC and PSE/JET. This option is suitable for applications requiring enhanced fault current handling capability and international compliance.

SCHURTER MSTU 250 Series (0034.7119, 0034.7319): These cross-manufacturer substitutes from SCHURTER provide equivalent electrical ratings with 50 A breaking capacity and 40.9 melting I²t. Dimensional height is 8.50 mm (versus 8.00 mm for Littelfuse parts), requiring verification of PCB clearance. The 0034.7319 variant is supplied in Cut Tape packaging, while 0034.7119 is supplied in Bulk packaging. cULus certification is provided. These parts are suitable where SCHURTER sourcing is preferred or required.

Frequently Asked Questions (FAQ)

Q: Can I substitute 37212500411 for 37412500430 in my design?

A: Yes. Both parts meet the primary substitution criteria: 2.5 A current rating, 250 V AC voltage rating, slow blow response, through-hole mounting, and radial can vertical package. The 37212500411 has lower breaking capacity (35 A versus 50 A) and higher melting I²t (35 versus 14), which may affect fault current handling in high-energy circuits. Verify that your application's fault current does not exceed 35 A and that the higher melting I²t is acceptable for your thermal design.

Q: What is the difference between 0034.7119 and 0034.7319?

A: Both are SCHURTER MSTU 250 series fuses with identical electrical specifications. The primary difference is packaging: 0034.7119 is supplied in Bulk packaging, while 0034.7319 is supplied in Cut Tape (CT) packaging. Electrical and mechanical performance are equivalent. Selection depends on your assembly process requirements and inventory management preferences.

Q: Are the SCHURTER parts (0034.7119, 0034.7319) physically compatible with the Littelfuse parts?

A: The SCHURTER parts have a height of 8.50 mm compared to 8.00 mm for Littelfuse parts. The diameter remains 0.335" (8.50 mm) for both manufacturers. Verify that your PCB layout and component clearance accommodate the additional 0.50 mm height. Through-hole mounting compatibility is maintained.

Q: Which substitute part has the best fault current handling?

A: The 38212500410 (TR5® 382 series) offers the highest breaking capacity at 100 A, making it suitable for applications with high fault current exposure. The 0034.7119 and 0034.7319 (SCHURTER MSTU 250) provide 50 A breaking capacity, matching the original 37412500430. The 37212500411 and 37212500431 (TR5® 372) are limited to 35 A breaking capacity.

Q: What certifications should I consider for regional compliance?

A: The original 37412500430 carries CSA and cULus certifications. For expanded regional compliance, the TR5® 372 series (37212500411, 37212500431) adds CCC, PSE, SEMKO, and VDE certifications. The TR5® 382 series (38212500410) provides the broadest coverage with CCC, cURus, KC, PSE/JET, SEMKO, and VDE. SCHURTER parts (0034.7119, 0034.7319) carry cULus certification. Select based on your target markets and regulatory requirements.

Q: Can I use 38212500410 as a direct replacement for 37412500430?

A: Yes, from an electrical and mechanical standpoint. The 38212500410 meets all primary substitution criteria and offers enhanced breaking capacity (100 A versus 50 A) and broader certifications. However, verify that your circuit design does not depend on the specific melting I²t characteristics of the original part (14 versus 29.69), as this affects thermal response time in overcurrent conditions.

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