Littelfuse 37412000430 Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 37412000430 is a 2 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 active product is manufactured in bulk packaging and maintains 1,268 units in current inventory. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical form factors, and thermal characteristics that permit direct functional replacement in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	2 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)
Breaking Capacity @ Rated Voltage	50 A
Operating Temperature Range	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 37412000430 is determined by the following critical parameters:

Primary Matching Criteria:

Current Rating: 2 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 (minimum requirement)

Secondary Compatibility Parameters:

Size / Dimension: 0.335" Dia x 0.315" H (8.50mm x 8.00mm) or compatible radial can geometry
Breaking Capacity @ Rated Voltage: 50 A or higher
Melting I²t: 7.5 or equivalent thermal response
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories: Direct Manufacturer Equivalents (identical electrical and mechanical specifications from Littelfuse or alternative manufacturers) and Parametric Equivalents (parts meeting all critical electrical parameters with minor variations in secondary characteristics such as breaking capacity or melting I²t).

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage (V AC)	Response	Breaking Capacity (A)	Melting I²t	DC Resistance (Ω)	Inventory (Pcs)
37412000430	Littelfuse Inc.	TR5® 374	2	250	Slow Blow	50	7.5	0.0395	1,268
37412000410	Littelfuse Inc.	TR5® 374	2	250	Slow Blow	50	7.5	0.0395	1,712
37212000411	Littelfuse Inc.	TR5® 372	2	250	Slow Blow	35	30	0.03	2,100
37212000431	Littelfuse Inc.	TR5® 372	2	250	Slow Blow	35	30	0.03	1,031
37212000511	Littelfuse Inc.	TR5® 372	2	250	Slow Blow	35	30	0.03	2,660
38212000410	Littelfuse Inc.	TR5® 382	2	250	Slow Blow	100	17.8	0.028	2,708
38212000430	Littelfuse	TR5® 382	2	250	Slow Blow	100	17.8	0.028	1,009
0034.7118	SCHURTER Inc.	MSTU 250	2	250	Slow Blow	50	28.6	—	1,597
0034.7318	SCHURTER Inc.	MSTU 250	2	250	Slow Blow	50	28.6	—	1,565

Engineering Selection Recommendations

Direct Equivalents (Preferred for Drop-In Replacement):

Littelfuse 37412000410 is a direct equivalent to the 37412000430, sharing identical electrical ratings, breaking capacity, melting I²t, and DC cold resistance within the TR5® 374 series. Both parts carry CSA and cULus approvals and maintain the same operating temperature range. This part is suitable for immediate substitution with no circuit redesign required.

Parametric Equivalents (Series Variants):

Littelfuse TR5® 372 series parts (37212000411, 37212000431, 37212000511) and TR5® 382 series parts (38212000410, 38212000430) maintain the core electrical specifications of 2 A, 250 V AC/DC, and slow blow response. The TR5® 372 variants exhibit lower breaking capacity (35 A) and higher melting I²t (30), while TR5® 382 variants provide higher breaking capacity (100 A) and intermediate melting I²t (17.8). Selection between these series depends on the specific circuit protection requirements and regulatory certifications mandated by the application.

Cross-Manufacturer Alternatives:

SCHURTER MSTU 250 series fuses (0034.7118 and 0034.7318) provide electrical equivalence with 2 A, 250 V AC/DC ratings and slow blow response. These parts carry cULus approval and maintain compatible radial can geometry. The 0034.7318 is supplied in cut tape packaging, while 0034.7118 is supplied in bulk. Melting I²t values (28.6) differ from the primary part, requiring thermal analysis confirmation for applications with strict inrush current or transient protection specifications.

Regulatory Compliance Considerations:

The main part 37412000430 carries CSA and cULus certifications. Parametric equivalents from the TR5® 372 and TR5® 382 series expand certification coverage to include CCC, PSE, SEMKO, VDE, and KC approvals, enabling use in markets requiring these specific regulatory certifications. Cross-manufacturer SCHURTER parts maintain cULus approval but do not carry the extended certification portfolio of Littelfuse TR5® variants.

Frequently Asked Questions (FAQ)

Q: Can I substitute Littelfuse 37412000410 for 37412000430 without circuit modification?

A: Yes. Both parts are identical in electrical rating (2 A, 250 V AC/DC), response time (slow blow), breaking capacity (50 A), melting I²t (7.5), and DC cold resistance (0.0395 Ω). They share the same TR5® 374 series designation and identical physical dimensions. No circuit redesign is required.

Q: What is the difference between TR5® 374, TR5® 372, and TR5® 382 series fuses?

A: All three series maintain the same electrical ratings (2 A, 250 V AC/DC, slow blow response) and physical form factor (0.335" Dia x 0.315" H radial can). The primary differences are breaking capacity and melting I²t: TR5® 374 provides 50 A breaking capacity with 7.5 melting I²t; TR5® 372 provides 35 A breaking capacity with 30 melting I²t; TR5® 382 provides 100 A breaking capacity with 17.8 melting I²t. Series selection depends on the circuit's fault current magnitude and transient protection requirements.

Q: Are SCHURTER 0034.7118 and 0034.7318 fully compatible with Littelfuse 37412000430?

A: Both SCHURTER parts match the electrical specifications (2 A, 250 V AC/DC, slow blow, 50 A breaking capacity) and physical dimensions (0.335" Dia radial can). The primary difference is melting I²t: SCHURTER parts specify 28.6 compared to 7.5 for the Littelfuse 37412000430. This difference affects thermal response to inrush currents and transient events. Compatibility depends on whether the circuit design accommodates the higher melting I²t value. The 0034.7318 is supplied in cut tape packaging, while 0034.7118 is supplied in bulk.

Q: What certifications does each substitute part carry?

A: Littelfuse 37412000430 and 37412000410 carry CSA and cULus approvals. Littelfuse TR5® 372 series (37212000411, 37212000431, 37212000511) and TR5® 382 series (38212000410, 38212000430) carry CCC, cURus, PSE, SEMKO, and VDE approvals in addition to cULus. SCHURTER MSTU 250 series (0034.7118, 0034.7318) carry cULus approval. Selection should align with the regulatory certifications required by the target market or application standard.

Q: Can I use a TR5® 382 part with higher breaking capacity (100 A) instead of the TR5® 374 (50 A)?

A: Electrical substitution is possible because both maintain 2 A, 250 V AC/DC ratings and slow blow response. However, the TR5® 382 series exhibits different thermal characteristics (melting I²t of 17.8 versus 7.5) and higher breaking capacity. This may affect circuit protection coordination and transient response. Application-specific analysis is required to confirm compatibility with the circuit's fault current profile and protection scheme.

Q: What is the difference between bulk and cut tape packaging for SCHURTER fuses?

A: Both 0034.7118 (bulk) and 0034.7318 (cut tape) are electrically and mechanically identical. Packaging format affects procurement and assembly processes. Bulk packaging is suitable for high-volume manufacturing with automated handling systems, while cut tape packaging is optimized for pick-and-place assembly equipment. Electrical performance and reliability are equivalent.

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