Littelfuse 37403150430 Equivalent & Substitute Parts

Part Overview

The Littelfuse 37403150430 is a 315 mA, 250 V AC/DC board mount fuse with slow blow response characteristics, designed for through hole radial mounting in the TR5® 374 series. This component is actively produced and widely used in power distribution and circuit protection applications. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity across manufacturing environments.

Key Parameters

Parameter	Value
Current Rating	315 mA
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

Substitution eligibility is determined by matching the following critical parameters: current rating (315 mA), voltage rating (250 V AC), response time (Slow Blow), mounting type (Through Hole), package configuration (Radial, Can, Vertical), and operating temperature range (-40°C ~ 85°C). Parts are grouped into two categories:

Direct Equivalents (Same Series): Parts 37403150410 and 37203150431 share identical electrical ratings, mechanical dimensions, and thermal specifications with the main part. These are interchangeable within the same design.

Parametric Equivalents (Cross-Manufacturer): SCHURTER parts 0034.7110 and 0034.7310 match all critical electrical and mechanical parameters but originate from a different manufacturer and series (MSTU 250). These support cross-manufacturer substitution strategies.

Series Variants: Part 37203150411 belongs to the TR5® 372 series and maintains electrical compatibility but exhibits different breaking capacity (35A vs. 50A) and melting I²t characteristics (0.3969 vs. 0.26).

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (mA)	Voltage (V AC)	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Size (mm)	Approval Agency
37403150430	Littelfuse Inc.	TR5® 374	315	250	Slow Blow	50	0.26	0.545	8.50 x 8.00	CSA, cULus
37403150410	Littelfuse Inc.	TR5® 374	315	250	Slow Blow	50	0.26	0.545	8.50 x 8.00	CSA, cULus
37203150411	Littelfuse Inc.	TR5® 372	315	250	Slow Blow	35	0.3969	0.276	8.50 x 8.00	CCC, cURus, SEMKO, VDE
37203150431	Littelfuse Inc.	TR5® 372	315	250	Slow Blow	35	0.3969	0.276	8.50 x 8.00	CCC, cURus, SEMKO, VDE
0034.7110	SCHURTER Inc.	MSTU 250	315	250	Slow Blow	50	0.361	Not specified	8.50 x 8.50	cULus
0034.7310	SCHURTER Inc.	MSTU 250	315	250	Slow Blow	50	0.361	Not specified	8.50 x 8.50	cULus

Engineering Selection Recommendations

Primary Substitutes (Littelfuse TR5® 374 Series): Parts 37403150430 and 37403150410 are direct equivalents with identical electrical characteristics, breaking capacity, and thermal performance. Both carry CSA and cULus certifications and are suitable for one-to-one replacement without design modification.

Secondary Substitutes (Littelfuse TR5® 372 Series): Parts 37203150411 and 37203150431 maintain electrical compatibility but feature reduced breaking capacity (35A vs. 50A) and increased melting I²t (0.3969 vs. 0.26). These are suitable for applications where the lower breaking capacity is acceptable. Certifications include CCC, cURus, SEMKO, and VDE, providing broader international compliance coverage.

Cross-Manufacturer Substitutes (SCHURTER MSTU 250 Series): Parts 0034.7110 and 0034.7310 provide equivalent electrical performance with 50A breaking capacity. Dimensional variation (8.50mm x 8.50mm vs. 8.50mm x 8.00mm) requires PCB layout verification. cULus certification is provided. Packaging differs: 0034.7110 is supplied in Bulk; 0034.7310 in Cut Tape (CT).

Frequently Asked Questions (FAQ)

Q: Can 37403150410 replace 37403150430 directly? A: Yes. Both parts are identical in electrical ratings (315 mA, 250 V AC), response time (Slow Blow), breaking capacity (50A), and physical dimensions (8.50mm x 8.00mm). They are interchangeable without design changes.

Q: What is the difference between TR5® 374 and TR5® 372 series parts? A: The TR5® 374 series (37403150430, 37403150410) provides 50A breaking capacity with 0.26 melting I²t. The TR5® 372 series (37203150411, 37203150431) offers 35A breaking capacity with 0.3969 melting I²t. Both maintain 315 mA current rating and 250 V voltage rating. Selection depends on application breaking capacity requirements.

Q: Can SCHURTER 0034.7110 or 0034.7310 be used as substitutes? A: Both SCHURTER parts match the 315 mA, 250 V AC electrical specifications and provide 50A breaking capacity. However, the physical height differs (8.50mm vs. 8.00mm). PCB footprint and mounting clearance must be verified before substitution. Packaging also differs: 0034.7110 is Bulk; 0034.7310 is Cut Tape (CT).

Q: What certifications apply to each substitute? A: Littelfuse TR5® 374 parts carry CSA and cULus certifications. Littelfuse TR5® 372 parts carry CCC, cURus, SEMKO, and VDE certifications. SCHURTER MSTU 250 parts carry cULus certification. Application regulatory requirements determine which certifications are necessary.

Q: Are all parts RoHS3 compliant? A: Yes. All listed parts (37403150430, 37403150410, 37203150411, 37203150431, 0034.7110, 0034.7310) are ROHS3 compliant and REACH unaffected.

Q: What is the inventory status of these parts? A: Current stock levels are: 37403150430 (1254 pcs), 37403150410 (1169 pcs), 37203150411 (5383 pcs), 37203150431 (1031 pcs), 0034.7110 (1185 pcs), 0034.7310 (901 pcs). Availability may change; verify with supplier for current stock status.

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