Littelfuse TR5® 374 Series 37400500430 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 37400500430 is a 50 mA, 250 V AC/DC board mount fuse with slow blow response characteristics, designed for through-hole radial mounting in vertical orientation. This fuse is part of the TR5® 374 series and carries active product status with CSA and cULus approvals. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits selection from qualified alternatives within the same electrical and mechanical parameter range.

Substiute Parts

37400500430

Littelfuse Inc.In Stock: 91737400500430 Datasheet

Current PartRFQ

37400500410

Littelfuse Inc.In Stock: 191737400500410 Datasheet

DirectRFQ

37200500431

Littelfuse Inc.In Stock: 167737200500431 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 37400500430 is determined by strict alignment of the following critical parameters:

• Current Rating: 50 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Can, Vertical (exact match required)
• Physical Dimensions: 0.335" Dia x 0.315" H / 8.50mm x 8.00mm (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

Two substitute parts meet these criteria: 37400500410 (direct manufacturer equivalent from TR5® 374 series) and 37200500431 (parametric equivalent from TR5® 372 series). Both maintain identical electrical ratings, physical form factor, and environmental specifications.

Parameter Comparison

Engineering Selection Recommendations

37400500410 (Direct Equivalent): This part is the primary substitute for 37400500430. Both parts belong to the TR5® 374 series and share identical electrical characteristics, including breaking capacity (50A), melting I²t (0.0056), and DC cold resistance (12.5 Ohms). Approval agencies are CSA and cULus. Selection of 37400500410 introduces no design or compliance considerations.

37200500431 (Parametric Equivalent): This part meets all critical substitution parameters but originates from the TR5® 372 series. Differences exist in breaking capacity (35A versus 50A), melting I²t (0.0108 versus 0.0056), and DC cold resistance (6.495 Ohms versus 12.5 Ohms). Approval agencies differ: CCC, cURus, SEMKO, and VDE. Selection of 37200500431 is appropriate when circuit requirements align with its specified breaking capacity and thermal characteristics. Compliance certifications must be evaluated against application requirements.

Frequently Asked Questions (FAQ)

Q: Can 37400500410 be used as a direct replacement for 37400500430? A: Yes. Both parts are from the TR5® 374 series with identical current rating (50 mA), voltage rating (250 V), response time (slow blow), mounting type (through hole), physical dimensions (0.335" Dia x 0.315" H), and electrical characteristics (50A breaking capacity, 0.0056 melting I²t, 12.5 Ohms DC cold resistance). Approval agencies are identical (CSA, cULus).

Q: What are the differences between 37400500430 and 37200500431? A: Both parts share identical current rating, voltage rating, response time, mounting type, and physical dimensions. Differences include series designation (TR5® 374 versus TR5® 372), breaking capacity (50A versus 35A), melting I²t (0.0056 versus 0.0108), DC cold resistance (12.5 Ohms versus 6.495 Ohms), and approval agencies (CSA/cULus versus CCC/cURus/SEMKO/VDE).

Q: Are all three parts RoHS compliant? A: Yes. All three parts—37400500430, 37400500410, and 37200500431—are ROHS3 compliant.

Q: Do physical dimensions differ among these parts? A: No. All three parts have identical physical dimensions: 0.335" Dia x 0.315" H (8.50mm x 8.00mm).

Q: Which part should be selected if breaking capacity is a critical design parameter? A: If 50A breaking capacity is required, select 37400500430 or 37400500410. If 35A breaking capacity is acceptable, 37200500431 is suitable. Breaking capacity specifications must align with circuit protection requirements.

Q: Are there differences in operating temperature range? A: No. All three parts operate across the identical temperature range: -40°C ~ 85°C.