Littelfuse 37415000430 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37415000430 is a 5 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 component is active in production with 876 units currently in stock. Alternative equivalent parts may be required due to supply constraints, design revisions, or specific certification requirements for regional compliance.

Key Parameters

Parameter	Value
Current Rating	5 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Mounting Type	Through Hole
Package / Case	Radial, Can, Vertical
Breaking Capacity @ Rated Voltage	50 A
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 for the Littelfuse 37415000430 is determined by strict parametric matching across the following critical criteria:

Primary Matching Parameters:

Current Rating: 5 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 (exact match required)
RoHS Status: ROHS3 Compliant (exact match required)

Secondary Considerations:

Breaking Capacity @ Rated Voltage: 50 A minimum
Melting I²t: 59 to 142 (acceptable range for slow blow fuses)
DC Cold Resistance: 0.0094 to 0.0122 Ohms (acceptable range)
Physical Dimensions: 0.335" Dia x 0.315" H to 0.335" Dia x 0.335" H (minor height variation acceptable)
Approval Agencies: CSA, cULus, CCC, cURus, PSE, SEMKO, VDE, CQC, KC, PSE/JET (regional certifications)

Substitute parts are grouped into two categories: Littelfuse TR5® series equivalents (same manufacturer, different series) and SCHURTER MSTU 250 series equivalents (alternative manufacturer, same electrical specifications).

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage (V AC)	Response	Breaking Capacity (A)	Melting I²t	DC Resistance (Ω)	Size (mm)	Certifications
37415000430	Littelfuse Inc.	TR5® 374	5	250	Slow Blow	50	59	0.0122	8.50 x 8.00	CSA, cULus
37215000411	Littelfuse Inc.	TR5® 372	5	250	Slow Blow	50	115	0.0094	8.50 x 8.00	CCC, cURus, PSE, SEMKO, VDE
37215000431	Littelfuse Inc.	TR5® 372	5	250	Slow Blow	50	115	0.0094	8.50 x 8.00	CCC, cURus, PSE, SEMKO, VDE
37415000410	Littelfuse Inc.	TR5® 374	5	250	Slow Blow	50	59	0.0122	8.50 x 8.00	CSA, cULus
38215000410	Littelfuse Inc.	TR5® 382	5	250	Slow Blow	100	121.25	0.0108	8.50 x 8.00	CQC, cURus, KC, PSE/JET, SEMKO, VDE
38215000430	Littelfuse	TR5® 382	5	250	Slow Blow	100	121.25	0.0108	8.50 x 8.00	CQC, cURus, KC, PSE/JET, SEMKO, VDE
0034.7122	SCHURTER Inc.	MSTU 250	5	250	Slow Blow	50	142	—	8.50 x 8.50	cULus
0034.7322	SCHURTER Inc.	MSTU 250	5	250	Slow Blow	50	142	—	8.50 x 8.50	cULus

Engineering Selection Recommendations

Littelfuse TR5® 374 Series (Direct Equivalents): 37415000410 is a direct parametric equivalent to 37415000430, sharing identical electrical specifications, breaking capacity, melting I²t, and DC cold resistance. Both carry CSA and cULus certifications. Selection between these two is based on inventory availability and design revision requirements.

Littelfuse TR5® 372 Series (Extended Certification Equivalents): 37215000411 and 37215000431 provide equivalent electrical performance with expanded regional certifications (CCC, PSE, SEMKO, VDE) in addition to cURus. These parts feature higher melting I²t (115 vs. 59) and lower DC cold resistance (0.0094 vs. 0.0122 Ohms), making them suitable for applications requiring broader international compliance. Both maintain identical current, voltage, and response characteristics.

Littelfuse TR5® 382 Series (Enhanced Breaking Capacity Equivalents): 38215000410 and 38215000430 offer doubled breaking capacity (100 A vs. 50 A) with comprehensive international certifications (CQC, cURus, KC, PSE/JET, SEMKO, VDE). These parts are suitable for applications requiring higher fault current protection margins while maintaining all primary electrical parameters.

SCHURTER MSTU 250 Series (Alternative Manufacturer Equivalents): 0034.7122 and 0034.7322 provide equivalent electrical specifications from an alternative manufacturer. Physical dimensions show minor height variation (8.50mm vs. 8.00mm). Certification is limited to cULus. These parts are suitable for applications where multi-source qualification is required or where SCHURTER supply chain availability is preferred.

Frequently Asked Questions (FAQ)

Q: Can I substitute 37415000430 with 37415000410? A: Yes. Both parts are Littelfuse TR5® 374 series with identical current rating (5 A), voltage rating (250 V AC), response time (slow blow), mounting type (through hole), package type (radial, can, vertical), breaking capacity (50 A), and operating temperature range (-40°C ~ 85°C). Selection is based on inventory availability and design revision status.

Q: What is the difference between TR5® 374 and TR5® 372 series? A: The TR5® 372 series (37215000411, 37215000431) provides higher melting I²t (115 vs. 59) and lower DC cold resistance (0.0094 vs. 0.0122 Ohms), with expanded regional certifications (CCC, PSE, SEMKO, VDE). All primary electrical parameters remain identical. Selection depends on certification requirements for target markets.

Q: When should I use TR5® 382 series parts (38215000410, 38215000430)? A: TR5® 382 series parts offer doubled breaking capacity (100 A vs. 50 A) and higher melting I²t (121.25 vs. 59). Use these when applications require enhanced fault current protection or when broader international certifications (CQC, KC, PSE/JET) are mandatory. All primary electrical specifications remain equivalent.

Q: Are SCHURTER MSTU 250 parts (0034.7122, 0034.7322) fully compatible? A: SCHURTER MSTU 250 parts match all critical electrical parameters (5 A, 250 V AC, slow blow, through hole, radial package). Physical dimensions show minor height variation (8.50mm vs. 8.00mm). Certification is limited to cULus. These parts are suitable for multi-source applications where mechanical fit and cULus certification are sufficient.

Q: What is the difference between 0034.7122 (Bulk) and 0034.7322 (Cut Tape)? A: Both parts are electrically and mechanically identical SCHURTER MSTU 250 fuses. The difference is packaging: 0034.7122 is supplied in bulk, while 0034.7322 is supplied in cut tape format. Selection is based on assembly process requirements and inventory management preferences.

Q: Can I use a substitute part with higher breaking capacity? A: Yes. Parts with higher breaking capacity (TR5® 382 series at 100 A vs. 50 A) provide enhanced protection margins and are electrically compatible. However, verify that your circuit design and application requirements support the higher breaking capacity specification.

Q: Which substitute offers the broadest international certification? A: TR5® 382 series parts (38215000410, 38215000430) provide the most comprehensive certifications: CQC, cURus, KC, PSE/JET, SEMKO, and VDE. These are recommended for applications requiring multi-region compliance.

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