Littelfuse 37211000511 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37211000511 is a 1 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 fuse is classified as Active product status and is ROHS3 compliant with multiple international approvals including CCC, cURus, PSE, SEMKO, and VDE. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical form factors, and mounting compatibility to support component sourcing flexibility and supply chain continuity.

Substiute Parts

37211000511

LittelfuseIn Stock: 195337211000511 Datasheet

Current PartRFQ

37211000411

Littelfuse Inc.In Stock: 194937211000411 Datasheet

Parametric EquivalentRFQ

37211000431

Littelfuse Inc.In Stock: 83837211000431 Datasheet

Parametric EquivalentRFQ

37411000430

LittelfuseIn Stock: 115037411000430 Datasheet

Parametric EquivalentRFQ

38211000410

Littelfuse Inc.In Stock: 380438211000410 Datasheet

Parametric EquivalentRFQ

38211000430

Littelfuse Inc.In Stock: 120138211000430 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the Littelfuse 37211000511 are qualified based on the following critical parameters:

• Electrical Equivalence: Current rating of 1 A and voltage rating of 250 V AC/DC
• Mechanical Compatibility: Through-hole radial mounting with identical physical dimensions (0.335" Dia x 8.50mm x 0.315" H / 8.00mm)
• Functional Characteristics: Slow blow response time classification
• Environmental Compliance: Operating temperature range of -40°C to 85°C and ROHS3 compliance

The identified substitute parts are grouped into two series categories: TR5® 372 series (37211000411, 37211000431) and TR5® 374/382 series (37411000430, 38211000410, 38211000430). All parts maintain the core electrical and mechanical specifications required for direct substitution in board mount fuse applications.

Parameter Comparison

Engineering Selection Recommendations

TR5® 372 Series Direct Equivalents (37211000411, 37211000431)

Parts 37211000411 and 37211000431 are parametric equivalents to the 37211000511, sharing identical electrical ratings, breaking capacity, melting I²t, and DC cold resistance values. Both maintain the same approval agency certifications (CCC, cURus, PSE, SEMKO, VDE) and are classified as Active product status. These parts are suitable for direct substitution without design modification.

TR5® 374 Series (37411000430)

Part 37411000430 maintains the core electrical specifications (1 A, 250 V AC/DC, slow blow) and identical physical dimensions. However, this part operates under a different series designation (TR5® 374) with modified breaking capacity (50 A versus 35 A) and melting I²t (2.1 versus 7.5). Approval agencies differ (CSA, cULus versus CCC, cURus, PSE, SEMKO, VDE). Substitution requires verification of application-specific breaking capacity and certification requirements.

TR5® 382 Series (38211000410, 38211000430)

Parts 38211000410 and 38211000430 are classified under the TR5® 382 series with enhanced breaking capacity (100 A) and expanded approval agency coverage (CCC, cURus, KC, PSE/JET, SEMKO, VDE). DC cold resistance is lower (0.0625 Ohms versus 0.079 Ohms) and melting I²t differs (4.85 versus 7.5). These parts maintain electrical and mechanical compatibility but represent a higher-performance variant. Substitution is permissible where enhanced breaking capacity and broader certifications are acceptable or beneficial.

Frequently Asked Questions (FAQ)

Q: Can 37211000411 and 37211000431 be used interchangeably with 37211000511?

A: Yes. Parts 37211000411 and 37211000431 are parametric equivalents with identical current rating (1 A), voltage rating (250 V AC/DC), response time (slow blow), breaking capacity (35 A), melting I²t (7.5), and DC cold resistance (0.079 Ohms). All three parts share the same approval agencies and operating temperature range. Direct substitution is supported.

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

A: The primary differences are breaking capacity and DC cold resistance. TR5® 372 series (37211000511, 37211000411, 37211000431) has a breaking capacity of 35 A and DC cold resistance of 0.079 Ohms. TR5® 382 series (38211000410, 38211000430) has a breaking capacity of 100 A and DC cold resistance of 0.0625 Ohms. Both series maintain identical current and voltage ratings. Selection depends on application breaking capacity requirements and certification needs.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All identified substitute parts (37211000411, 37211000431, 37411000430, 38211000410, 38211000430) are ROHS3 compliant and meet REACH unaffected status, matching the compliance profile of the 37211000511.

Q: What approval agencies are required for my application?

A: The 37211000511 carries CCC, cURus, PSE, SEMKO, and VDE approvals. TR5® 372 equivalents (37211000411, 37211000431) maintain identical approvals. TR5® 374 series (37411000430) carries CSA and cULus approvals. TR5® 382 series (38211000410, 38211000430) carries CCC, cURus, KC, PSE/JET, SEMKO, and VDE approvals. Verify that substitute part certifications align with your regional and application-specific requirements.

Q: Can I substitute a TR5® 382 series fuse for a TR5® 372 series fuse?

A: Electrical and mechanical compatibility is maintained. However, TR5® 382 series parts have different breaking capacity (100 A versus 35 A), melting I²t (4.85 versus 7.5), and DC cold resistance (0.0625 Ohms versus 0.079 Ohms). Substitution is permissible where these parameter differences are acceptable to the application design and certification requirements.

Q: What is the physical form factor for all these fuses?

A: All substitute parts maintain identical physical dimensions: 0.335" diameter by 0.315" height (8.50mm x 8.00mm). All are through-hole radial mount, can-style, vertical orientation fuses suitable for board mount applications.