Littelfuse 38214000430 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 38214000430 is a 4 A, 250 V AC/DC board mount fuse with slow blow response characteristics, designed for through-hole radial mounting in protective circuit applications. This TR5® 382 series fuse is an active product with full international compliance certifications. Substitute parts are identified based on matching electrical ratings, mechanical compatibility, and approval agency certifications to ensure direct functional equivalence in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	4 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Mounting Type	Through Hole
Fuse Type	Board Mount (Cartridge Style Excluded)
Package / Case	Radial, Can, Vertical
Breaking Capacity @ Rated Voltage	100 A
Operating Temperature Range	-40°C to 85°C
Size / Dimension	0.335" Dia x 0.315" H (8.50mm x 8.00mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the Littelfuse 38214000430 are classified into two categories based on electrical and mechanical parameter alignment:

Direct Manufacturer Equivalents (Littelfuse Series TR5® 382):

Part 38214000410 matches all critical electrical parameters: 4 A current rating, 250 V AC voltage rating, slow blow response, 100 A breaking capacity, and identical physical dimensions (0.335" Dia x 0.315" H). This part is interchangeable within the same series.

Parametric Equivalents (Littelfuse Series TR5® 372):

Parts 37214000411, 37214000431, and 37214000511 share the same current rating (4 A), voltage rating (250 V AC), response time (slow blow), and physical dimensions. However, these parts operate with a reduced breaking capacity of 40 A and increased melting I²t of 126.4 compared to the main part's 100 A breaking capacity and 72 melting I²t. These parts are suitable for applications where the lower breaking capacity is acceptable.

Cross-Manufacturer Equivalents (SCHURTER MXT 250 Series):

Parts 0034.6921 (Bulk packaging) and 0034.6981 (Cut Tape packaging) are SCHURTER equivalents with matching 4 A, 250 V AC ratings and slow blow response. These parts maintain 100 A breaking capacity and similar melting I²t (77 vs. 72). Physical dimensions are 0.335" Dia x 0.335" H, representing a 0.02" height difference from the main part.

Substitution is determined by matching current rating, voltage rating, response time, mounting type, and physical compatibility within the specified tolerance range.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage Rating (V AC)	Response Time	Breaking Capacity (A)	Melting I²t	Size (Dia x H)	Packaging	Inventory (Pcs)
38214000430	Littelfuse	TR5® 382	4	250	Slow Blow	100	72	0.335" x 0.315" (8.50mm x 8.00mm)	Bulk	800
38214000410	Littelfuse	TR5® 382	4	250	Slow Blow	100	72	0.335" x 0.315" (8.50mm x 8.00mm)	Bulk	1286
37214000411	Littelfuse	TR5® 372	4	250	Slow Blow	40	126.4	0.335" x 0.315" (8.50mm x 8.00mm)	Bulk	1309
37214000431	Littelfuse	TR5® 372	4	250	Slow Blow	40	126.4	0.335" x 0.315" (8.50mm x 8.00mm)	Bulk	1154
37214000511	Littelfuse	TR5® 372	4	250	Slow Blow	40	126.4	0.335" x 0.315" (8.50mm x 8.00mm)	Bulk	1117
0034.6921	SCHURTER	MXT 250	4	250	Slow Blow	100	77	0.335" x 0.335" (8.50mm x 8.50mm)	Bulk	4874
0034.6981	SCHURTER	MXT 250	4	250	Slow Blow	100	77	0.335" x 0.335" (8.50mm x 8.50mm)	Cut Tape (CT)	7694

Engineering Selection Recommendations

Primary Substitute (Highest Compatibility): Part 38214000410 is the direct equivalent within the Littelfuse TR5® 382 series, offering identical electrical specifications, breaking capacity, and physical dimensions. This part maintains full compatibility with the original design and carries the same approval certifications (CCC, cURus, KC, PSE/JET, SEMKO, VDE).

Secondary Substitutes (Littelfuse TR5® 372 Series): Parts 37214000411, 37214000431, and 37214000511 are suitable for applications where reduced breaking capacity (40 A vs. 100 A) is acceptable. These parts share identical current and voltage ratings with matching physical dimensions. Approval certifications are equivalent with the exception of KC certification, which is not listed for the TR5® 372 series.

Cross-Manufacturer Substitutes (SCHURTER MXT 250 Series): Parts 0034.6921 and 0034.6981 provide functional equivalence with maintained 100 A breaking capacity. The 0.02" height difference (0.335" vs. 0.315") must be evaluated for mechanical clearance in the target application. Both parts carry CCC, cURus, KC, PSE/JET, and VDE certifications. Part 0034.6981 in Cut Tape packaging offers higher inventory availability (7694 pcs) compared to bulk packaging alternatives.

All substitute parts maintain ROHS3 compliance, REACH unaffected status, and operating temperature range of -40°C to 85°C.

Frequently Asked Questions (FAQ)

Q: Can I use part 37214000431 as a direct replacement for 38214000430? A: Part 37214000431 shares the same current rating (4 A), voltage rating (250 V AC), response time (slow blow), and physical dimensions. However, it operates with a reduced breaking capacity of 40 A compared to the original part's 100 A. This substitution is valid only if the application does not require the higher breaking capacity specification.

Q: What is the difference between the Littelfuse TR5® 382 and TR5® 372 series? A: The primary difference is breaking capacity and melting I²t. The TR5® 382 series (part 38214000430) provides 100 A breaking capacity with 72 melting I²t, while the TR5® 372 series provides 40 A breaking capacity with 126.4 melting I²t. Both series maintain identical current and voltage ratings and physical dimensions.

Q: Are SCHURTER parts 0034.6921 and 0034.6981 interchangeable? A: These parts are electrically and mechanically equivalent. The difference is packaging: 0034.6921 is supplied in Bulk packaging, while 0034.6981 is supplied in Cut Tape (CT) packaging. Selection depends on assembly process requirements and inventory management preferences.

Q: Does the 0.02" height difference in SCHURTER parts affect compatibility? A: SCHURTER parts 0034.6921 and 0034.6981 measure 0.335" Dia x 0.335" H compared to the Littelfuse main part's 0.335" Dia x 0.315" H. This 0.02" height difference must be evaluated for mechanical clearance within the target PCB layout and enclosure design. Electrical performance is not affected.

Q: Which substitute part has the highest inventory availability? A: SCHURTER part 0034.6981 (Cut Tape packaging) has the highest inventory at 7694 pcs, followed by SCHURTER part 0034.6921 (Bulk packaging) at 4874 pcs. Littelfuse part 37214000411 has 1309 pcs in stock.

Q: Are all substitute parts RoHS3 compliant? A: Yes, all listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the environmental compliance profile of the main part 38214000430.

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