Littelfuse 37412000000 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37412000000 is a 2 A, 250 V AC/DC board mount fuse with slow blow response characteristics, designed for through-hole radial mounting in vertical orientation. This TR5® 374 series fuse is actively produced and widely stocked. Substitute parts are identified when equivalent electrical ratings, mechanical compatibility, and regulatory approvals align with the original specification, enabling direct replacement in circuit designs without functional compromise.

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)
Fuse Type	Board Mount (Cartridge Style Excluded)
Operating Temperature Range	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the Littelfuse 37412000000 are qualified based on the following criteria:

Mandatory Matching Parameters:

Current Rating: 2 A
Voltage Rating (AC): 250 V
Response Time: Slow Blow
Mounting Type: Through Hole
Package / Case: Radial, Can, Vertical
Operating Temperature Range: -40°C ~ 85°C
RoHS Status: ROHS3 Compliant

Allowable Variations:

Breaking Capacity @ Rated Voltage: May vary (50 A, 35 A, or 100 A)
Melting I²t: May vary (7.5, 30, or 17.8)
DC Cold Resistance: May vary (0.0395, 0.03, or 0.028 Ohms)
Approval Agency certifications: May differ while maintaining active product status
Physical dimensions: Minor tolerance variations permitted (0.335" Dia x 0.315" H to 0.335" Dia x 0.335" H)
Manufacturer: Littelfuse Inc. or SCHURTER Inc.

Three substitute parts meet these criteria: Littelfuse 37212000001 (TR5® 372 series), Littelfuse 38212000000 (TR5® 382 series), and SCHURTER 0034.7318 (MSTU 250 series).

Parameter Comparison

Parameter	37412000000 (Main)	37212000001	38212000000	0034.7318
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	SCHURTER Inc.
Series	TR5® 374	TR5® 372	TR5® 382	MSTU 250
Current Rating (Amps)	2 A	2 A	2 A	2 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical
Size / Dimension	0.335" Dia x 0.315" H (8.50mm x 8.00mm)	0.335" Dia x 0.315" H (8.50mm x 8.00mm)	0.335" Dia x 0.315" H (8.50mm x 8.00mm)	0.335" Dia x 0.335" H (8.50mm x 8.50mm)
Breaking Capacity @ Rated Voltage	50 A	35 A	100 A	50 A
Melting I²t	7.5	30	17.8	28.6
DC Cold Resistance (Ohms)	0.0395	0.03	0.028	Not specified
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three substitute parts maintain active product status and ROHS3 compliance, qualifying them for direct replacement in applications requiring a 2 A, 250 V AC/DC slow blow board mount fuse with through-hole radial mounting.

Littelfuse 37212000001 (TR5® 372): Offers the lowest breaking capacity at 35 A and highest melting I²t at 30. Select this part when circuit protection requirements align with these thermal and electrical characteristics. Certifications include CCC, cURus, PSE, SEMKO, and VDE.

Littelfuse 38212000000 (TR5® 382): Provides the highest breaking capacity at 100 A with moderate melting I²t at 17.8. This part accommodates applications requiring enhanced fault current handling. Certifications include CCC, cURus, KC, PSE/JET, SEMKO, and VDE.

SCHURTER 0034.7318 (MSTU 250): Matches the main part's breaking capacity at 50 A with melting I²t at 28.6. Physical height is 0.335" (8.50mm) compared to the main part's 0.315" (8.00mm). Certification includes cULus. This part is suitable when SCHURTER component standardization is required.

Frequently Asked Questions (FAQ)

Q: Can Littelfuse 37212000001 replace Littelfuse 37412000000 in all applications?

A: Yes, provided the circuit design accommodates the lower breaking capacity of 35 A and higher melting I²t of 30. Both parts share identical current, voltage, response time, mounting type, and package specifications.

Q: What is the primary difference between the three Littelfuse substitutes?

A: The TR5® 374, TR5® 372, and TR5® 382 series differ in breaking capacity and melting I²t values. The 374 (main part) has 50 A breaking capacity; the 372 has 35 A; the 382 has 100 A. These differences affect fault current handling characteristics.

Q: Is SCHURTER 0034.7318 mechanically compatible with the original part?

A: The SCHURTER part has a height of 0.335" (8.50mm) versus the main part's 0.315" (8.00mm). Verify PCB layout and component clearance before substitution. The diameter remains 0.335" (8.50mm) for both.

Q: Do all substitute parts have the same regulatory approvals?

A: No. The main part carries CSA and cULus approvals. Littelfuse 37212000001 includes CCC, cURus, PSE, SEMKO, and VDE. Littelfuse 38212000000 includes CCC, cURus, KC, PSE/JET, SEMKO, and VDE. SCHURTER 0034.7318 carries cULus approval. Confirm required certifications for your application.

Q: Can I use Littelfuse 38212000000 in place of Littelfuse 37412000000?

A: Yes. The 38212000000 provides higher breaking capacity (100 A versus 50 A) and lower DC cold resistance (0.028 Ohms versus 0.0395 Ohms), making it suitable for applications requiring enhanced fault protection.

Q: What does "slow blow" response time mean for these fuses?

A: Slow blow fuses tolerate temporary inrush currents without nuisance operation, opening only under sustained overcurrent conditions. All listed parts share this characteristic.

Q: Are all parts ROHS3 compliant?

A: Yes. The main part and all three substitutes are ROHS3 compliant, meeting environmental and hazardous substance restrictions.

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