SR-5F-2A-BK Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The SR-5F-2A-BK is a 2 A, 250 V AC/DC board mount fuse manufactured by Eaton - Electronics Division. This fast-blow fuse is designed for through-hole radial mounting in vertical orientation with a radial can package style. The part is currently active in production with 1215 units in stock. Equivalent and substitute parts are identified when identical electrical specifications, mechanical compatibility, and regulatory certifications align with the original component requirements.

Substiute Parts

SR-5F-2A-BK

Eaton - Electronics DivisionIn Stock: 1241SR-5F-2A-BK Datasheet

Current PartRFQ

37312000410

Littelfuse Inc.In Stock: 260037312000410 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SR-5F-2A-BK is determined by strict alignment of the following critical parameters:

Electrical Specifications:

• Current Rating: 2 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity @ Rated Voltage: 50 A (exact match required)

Mechanical Specifications:

• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Can, Vertical (exact match required)
• Size / Dimension: 0.335" Dia x 0.319" H / 8.50mm x 8.10mm (exact match required)

Regulatory & Compliance:

• RoHS3 Compliant (required)
• Approval Agencies: cULus certification (required minimum)

The substitute part 37312000410 (Littelfuse Inc., TR5® 373 series) meets all critical electrical and mechanical parameters. Minor variations in melting I²t, DC cold resistance, and maximum operating temperature do not disqualify substitution when all primary specifications align.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: 37312000410 (Littelfuse Inc., TR5® 373)

The Littelfuse 37312000410 is functionally equivalent to the SR-5F-2A-BK for applications requiring a 2 A, 250 V AC/DC fast-blow board mount fuse with through-hole radial mounting. Both parts carry ROHS3 compliance and cULus certification, meeting regulatory requirements for equivalent component selection.

Selection Considerations:

1. Electrical Compatibility: All critical electrical parameters (current rating, voltage rating, response time, breaking capacity) are identical between the two parts.

2. Mechanical Compatibility: Both parts feature identical mounting type (through-hole), package style (radial, can, vertical), and functionally equivalent dimensions (height difference of 0.004" / 0.10mm is within manufacturing tolerance for vertical mounting applications).

3. Regulatory Compliance: Both parts are ROHS3 compliant and carry cULus certification. The Littelfuse part additionally carries CSA certification.

4. Operating Temperature: The Littelfuse part operates within -40°C to 85°C, which is narrower than the Eaton part (-40°C to 125°C). Selection of the Littelfuse substitute is appropriate for applications operating within the -40°C to 85°C range.

5. Resistance Characteristics: The DC cold resistance of the Littelfuse part (0.03857 Ohms) is lower than the Eaton part (0.058 Ohms). This difference does not affect fuse function in standard board mount applications.

6. Melting I²t: The Littelfuse part exhibits a lower melting I²t value (0.63 versus 9). Both parts maintain fast-blow response characteristics and meet the 50 A breaking capacity specification.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 37312000410 be used as a direct replacement for the Eaton SR-5F-2A-BK?

A: Yes, the Littelfuse 37312000410 is a direct substitute for applications operating within the -40°C to 85°C temperature range. All critical electrical specifications (2 A, 250 V, fast-blow, 50 A breaking capacity) and mechanical parameters (through-hole, radial can, vertical orientation) are identical. Both parts are ROHS3 compliant and carry cULus certification.

Q: What is the significance of the different melting I²t values?

A: Melting I²t is a thermal characteristic that influences the fuse's response to overcurrent conditions. Both parts are classified as fast-blow fuses and meet the same 50 A breaking capacity specification. The difference in melting I²t does not prevent substitution in standard board mount fuse applications where the 2 A current rating and fast-blow response are the primary design requirements.

Q: Are there any dimensional compatibility issues between these parts?

A: The parts have functionally equivalent dimensions. The Littelfuse part is 0.004" (0.10mm) shorter in height (0.315" versus 0.319"). This minor difference is within manufacturing tolerance and does not affect through-hole mounting compatibility or board layout.

Q: What is the difference in DC cold resistance, and does it matter?

A: The Littelfuse part has lower DC cold resistance (0.03857 Ohms versus 0.058 Ohms). This characteristic affects voltage drop under normal operating current but does not impact fuse protection function. Both values are acceptable for board mount fuse applications.

Q: Which certifications are required for my application?

A: Both parts carry cULus certification, which is the primary requirement for North American applications. The Littelfuse part additionally carries CSA certification. The Eaton part carries PSE certification for Japanese market compliance. Select based on your specific regional requirements.

Q: Can I use the Littelfuse part in applications operating above 85°C?

A: No. The Littelfuse 37312000410 is rated for operation up to 85°C maximum. If your application requires operation up to 125°C, the Eaton SR-5F-2A-BK is the appropriate choice. Verify your application's maximum operating temperature before selecting a substitute.

Q: Are both parts currently in production?

A: Yes. Both the Eaton SR-5F-2A-BK and Littelfuse 37312000410 are active products in current production with inventory available.