Littelfuse 37213150511 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37213150511 is a 3.15 A, 250 V AC/DC board mount fuse with slow blow response characteristics, designed for through-hole radial mounting in TR5® 372 series applications. This component is active in production with 1134 units in stock. Alternative equivalent parts are necessary when primary stock is unavailable, when different approval agency certifications are required for specific regional markets, or when design specifications allow for compatible series variants with different breaking capacities or melting I²t characteristics.

Key Parameters

Parameter	Value
Current Rating	3.15 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
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
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 37213150511 is determined by strict adherence to the following parameters:

Critical Parameters (Must Match Exactly):

Current Rating: 3.15 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
Operating Temperature Range: -40°C ~ 85°C
RoHS Status: ROHS3 Compliant

Variable Parameters (Allowed to Differ):

Series designation (TR5® 372, TR5® 374, TR5® 382)
Breaking Capacity @ Rated Voltage (35A, 50A, 100A)
Melting I²t (77.3955, 22, 45.35)
DC Cold Resistance (0.0173, 0.0227, 0.0176 Ohms)
Approval Agency certifications
Manufacturer (Littelfuse Inc., Eaton - Electronics Division)
Packaging format (Bulk, Cut Tape)

All substitute parts listed maintain identical electrical performance at rated current and voltage while offering alternative mechanical or certification characteristics suitable for equivalent circuit protection applications.

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage (V AC)	Response	Breaking Capacity (A)	Melting I²t	DC Resistance (Ω)	Inventory (Pcs)
37213150511	Littelfuse Inc.	TR5® 372	3.15	250	Slow Blow	35	77.3955	0.0173	1134
37213150411	Littelfuse Inc.	TR5® 372	3.15	250	Slow Blow	35	77.3955	0.0173	2460
37213150431	Littelfuse Inc.	TR5® 372	3.15	250	Slow Blow	35	77.3955	0.0173	742
37413150410	Littelfuse Inc.	TR5® 374	3.15	250	Slow Blow	50	22	0.0227	1869
37413150430	Littelfuse Inc.	TR5® 374	3.15	250	Slow Blow	50	22	0.0227	1084
38213150410	Littelfuse Inc.	TR5® 382	3.15	250	Slow Blow	100	45.35	0.0176	1259
38213150430	Littelfuse Inc.	TR5® 382	3.15	250	Slow Blow	100	45.35	0.0176	1013
SR-5-3.15A-AP	Eaton - Electronics Division	SR-5	3.15	250	Slow Blow	35	57	0.018	5300
SR-5-3.15A-BK	Eaton - Electronics Division	SR-5	3.15	250	Slow Blow	35	57	0.018	1054

Engineering Selection Recommendations

Littelfuse TR5® 372 Series (37213150411, 37213150431): These parts are direct parametric equivalents to the 37213150511, maintaining identical electrical characteristics and breaking capacity. Selection among these variants depends on packaging requirements and inventory availability. All three parts carry identical approval agency certifications: CCC, cURus, PSE, SEMKO, VDE.

Littelfuse TR5® 374 Series (37413150410, 37413150430): These parts provide increased breaking capacity (50A versus 35A) and reduced melting I²t (22 versus 77.3955). These variants are suitable for applications where higher fault current withstand capability is required. Approval agencies differ: CSA and cULus only. Use only when circuit design specifications explicitly allow for these parameter variations.

Littelfuse TR5® 382 Series (38213150410, 38213150430): These parts offer the highest breaking capacity (100A) and intermediate melting I²t (45.35). Approval agency coverage is expanded: CCC, cURus, KC, PSE/JET, SEMKO, VDE. Selection is appropriate for applications requiring enhanced fault protection and broader regional compliance.

Eaton SR-5 Series (SR-5-3.15A-AP, SR-5-3.15A-BK): These cross-manufacturer alternatives maintain the same current, voltage, and response characteristics with 35A breaking capacity. Melting I²t is 57, positioned between TR5® 372 and TR5® 374 series. Approval agencies include CCC, cULus, KC-MARK, PSE, SEMKO, VDE. The SR-5-3.15A-AP variant is supplied in Cut Tape packaging; SR-5-3.15A-BK is supplied in Bulk packaging. Both are RoHS compliant and suitable for direct substitution in applications where Eaton certification is acceptable.

Frequently Asked Questions (FAQ)

Q: Can I substitute a TR5® 374 series fuse for the original TR5® 372 part?

A: Yes, if your circuit design permits. The TR5® 374 maintains identical current and voltage ratings but provides higher breaking capacity (50A versus 35A) and lower melting I²t (22 versus 77.3955). This results in faster response to fault conditions. Verify that your application's fault current rating and thermal design accommodate these differences before substitution.

Q: What is the difference between the Littelfuse and Eaton alternatives?

A: Both manufacturers provide equivalent 3.15 A, 250 V slow blow fuses in radial, can, vertical packages. Littelfuse TR5® series parts offer three breaking capacity options (35A, 50A, 100A). Eaton SR-5 series provides 35A breaking capacity. Approval agency certifications differ slightly. Selection depends on your regional compliance requirements and existing supplier relationships.

Q: Are all substitute parts ROHS3 compliant?

A: All Littelfuse TR5® series parts (372, 374, 382) are ROHS3 compliant. Eaton SR-5-3.15A-AP is RoHS compliant; SR-5-3.15A-BK is ROHS3 compliant. Verify your specific compliance requirements before selection.

Q: Does package format (Bulk versus Cut Tape) affect electrical performance?

A: No. Package format affects only handling, storage, and assembly processes. Bulk and Cut Tape variants of the same part number are electrically identical. Selection depends on your manufacturing process and inventory management requirements.

Q: Can I use a higher breaking capacity fuse as a direct replacement?

A: Higher breaking capacity fuses (TR5® 382 at 100A versus original 35A) are electrically compatible at rated current and voltage. However, they exhibit different fault response characteristics due to different melting I²t values. Use only when circuit design specifications explicitly allow for these variations or when enhanced fault protection is required.

Q: What approval agencies are common across all substitute options?

A: CCC, cULus, PSE, and SEMKO certifications are present across all listed alternatives. VDE certification is present in all Littelfuse parts and Eaton SR-5 series. If your application requires specific regional certifications, consult the approval agency list for each part number.

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