Littelfuse 38212000430 Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 38212000430 is a 2 A, 250 V AC/DC board mount fuse with radial, can, vertical package configuration. This TR5® 382 series fuse is designed for through-hole mounting applications requiring slow-blow response characteristics. The part is active in production with full compliance to international safety standards including CCC, cURus, KC, PSE/JET, SEMKO, and VDE certifications. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical form factors, and functional performance parameters to support design flexibility and supply chain continuity.

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)
Operating Temperature Range	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the Littelfuse 38212000430 are classified into two categories based on substitution criteria:

Direct Equivalents (Same Series - TR5® 382):

38212000410: Identical electrical and mechanical specifications within the same TR5® 382 series. Interchangeable for all applications.

Parametric Equivalents (Alternative Series):

37212000411, 37212000431, 37212000511: TR5® 372 series parts with matching 2 A, 250 V ratings and identical physical dimensions. These parts differ in breaking capacity (35 A vs. 100 A) and melting I²t characteristics (30 vs. 17.8).
37412000410, 37412000430: TR5® 374 series parts with matching 2 A, 250 V ratings and identical physical dimensions. These parts differ in breaking capacity (50 A vs. 100 A) and melting I²t characteristics (7.5 vs. 17.8).

Cross-Manufacturer Equivalents (SCHURTER MXT 250 Series):

0034.6918, 0034.6978: SCHURTER MXT 250 series parts with matching 2 A, 250 V ratings. Mechanical dimensions vary slightly (0.335" Dia x 0.335" H vs. 0.335" Dia x 0.315" H). Melting I²t is 16 (vs. 17.8). Breaking capacity is 100 A. Packaging differs (0034.6918 in Bulk; 0034.6978 in Cut Tape).

Substitution is determined by matching current rating, voltage rating, response time, mounting type, package form factor, and operating temperature range. Breaking capacity and melting I²t are secondary parameters that may vary between series.

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage (V AC)	Response Time	Breaking Capacity (A)	Melting I²t	Size (mm)	DC Cold Resistance (Ω)	Certifications
38212000430	Littelfuse	TR5® 382	2	250	Slow Blow	100	17.8	8.50 x 8.00	0.028	CCC, cURus, KC, PSE/JET, SEMKO, VDE
38212000410	Littelfuse	TR5® 382	2	250	Slow Blow	100	17.8	8.50 x 8.00	0.028	CCC, cURus, KC, PSE/JET, SEMKO, VDE
37212000411	Littelfuse	TR5® 372	2	250	Slow Blow	35	30	8.50 x 8.00	0.03	CCC, cURus, PSE, SEMKO, VDE
37212000431	Littelfuse	TR5® 372	2	250	Slow Blow	35	30	8.50 x 8.00	0.03	CCC, cURus, PSE, SEMKO, VDE
37212000511	Littelfuse	TR5® 372	2	250	Slow Blow	35	30	8.50 x 8.00	0.03	CCC, cURus, PSE, SEMKO, VDE
37412000410	Littelfuse	TR5® 374	2	250	Slow Blow	50	7.5	8.50 x 8.00	0.0395	CSA, cULus
37412000430	Littelfuse	TR5® 374	2	250	Slow Blow	50	7.5	8.50 x 8.00	0.0395	CSA, cULus
0034.6918	SCHURTER	MXT 250	2	250	Slow Blow	100	16	8.50 x 8.50	Not specified	CCC, cURus, KC, PSE/JET, VDE
0034.6978	SCHURTER	MXT 250	2	250	Slow Blow	100	16	8.50 x 8.50	Not specified	CCC, cURus, KC, PSE/JET, VDE

Engineering Selection Recommendations

Primary Selection (Direct Equivalent): Part 38212000410 is the direct equivalent within the TR5® 382 series and is the preferred substitute. It maintains identical electrical specifications, mechanical dimensions, and certification coverage. Selection between 38212000430 and 38212000410 is based on inventory availability and packaging requirements (both available in Bulk).

Secondary Selection (Littelfuse TR5® 372 Series): Parts 37212000411, 37212000431, and 37212000511 are parametric equivalents suitable for applications where lower breaking capacity (35 A) and higher melting I²t (30) are acceptable. These parts carry reduced certification coverage (PSE replaces PSE/JET; KC is not included). Selection among these three parts is based on inventory availability.

Tertiary Selection (Littelfuse TR5® 374 Series): Parts 37412000410 and 37412000430 are parametric equivalents suitable for applications where lower breaking capacity (50 A) and lower melting I²t (7.5) are acceptable. These parts carry limited certification coverage (CSA and cULus only; no CCC, KC, PSE/JET, SEMKO, or VDE). Use only when application requirements align with CSA/cULus certification scope.

Cross-Manufacturer Selection (SCHURTER MXT 250): Parts 0034.6918 and 0034.6978 are cross-manufacturer equivalents with matching electrical ratings and breaking capacity. Physical dimensions differ slightly in height (8.50 mm vs. 8.00 mm). Certification coverage excludes KC and PSE/JET. Part 0034.6978 is available in Cut Tape packaging; 0034.6918 is available in Bulk. Use only when SCHURTER supply chain is preferred and dimensional tolerance permits the 0.50 mm height difference.

Frequently Asked Questions (FAQ)

Q: Can 38212000410 be used as a direct replacement for 38212000430? A: Yes. Both parts are from the TR5® 382 series with identical electrical ratings (2 A, 250 V), response time (Slow Blow), physical dimensions (8.50 mm x 8.00 mm), breaking capacity (100 A), and certification coverage. They are fully interchangeable.

Q: What is the difference between TR5® 382, TR5® 372, and TR5® 374 series fuses? A: The primary differences are breaking capacity and melting I²t. TR5® 382 has 100 A breaking capacity and 17.8 melting I²t. TR5® 372 has 35 A breaking capacity and 30 melting I²t. TR5® 374 has 50 A breaking capacity and 7.5 melting I²t. All maintain the same 2 A, 250 V electrical ratings and physical form factor.

Q: Can I use a TR5® 372 or TR5® 374 part in place of the TR5® 382? A: Substitution is possible only if the application requirements permit lower breaking capacity and different melting I²t characteristics. TR5® 372 and TR5® 374 parts carry reduced certification coverage compared to TR5® 382. Verify that the target certification scope (CSA/cULus for TR5® 374; CCC/cURus/PSE/SEMKO/VDE for TR5® 372) meets application requirements.

Q: What is the significance of the melting I²t parameter? A: Melting I²t defines the thermal energy required to melt the fuse element. Lower melting I²t (7.5 for TR5® 374) indicates faster thermal response; higher melting I²t (30 for TR5® 372) indicates slower thermal response. The main part (38212000430) has melting I²t of 17.8. Selection depends on circuit protection requirements and inrush current tolerance.

Q: Can SCHURTER 0034.6918 or 0034.6978 be used instead of Littelfuse parts? A: Yes, if the 0.50 mm height difference (8.50 mm vs. 8.00 mm) is accommodated by the board layout and if certification requirements are met. SCHURTER parts lack KC and PSE/JET certifications. Verify that CCC, cURus, VDE coverage is sufficient for the application.

Q: What is the difference between 0034.6918 and 0034.6978? A: Both are SCHURTER MXT 250 series parts with identical electrical and mechanical specifications. The difference is packaging: 0034.6918 is supplied in Bulk; 0034.6978 is supplied in Cut Tape (CT). Selection is based on assembly process requirements and inventory management.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All parts listed (Littelfuse TR5® 382, TR5® 372, TR5® 374, and SCHURTER MXT 250) are RoHS3 compliant. REACH status is either REACH Unaffected or not specified, indicating no regulatory restriction on use.

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