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

Part Overview

The SR-5F-2A-AP is a 2 A, 250 V AC/DC board mount fuse manufactured by Eaton - Electronics Division. This through-hole radial fuse is designed for fast-blow response applications requiring board-level protection in industrial and commercial equipment. The part is currently active in production with 977 pieces in stock. Substitute parts are identified when equivalent electrical and mechanical parameters are required due to inventory constraints, supply chain considerations, or design flexibility within the allowed parameter specifications.

Substiute Parts

SR-5F-2A-AP

Eaton - Electronics DivisionIn Stock: 1056SR-5F-2A-AP Datasheet

Current PartRFQ

37312000410

Littelfuse Inc.In Stock: 260037312000410 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SR-5F-2A-AP is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 2 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Can, Vertical (exact match required)
• Breaking Capacity @ Rated Voltage: 50 A (exact match required)

Allowable Variation Parameters:

• Size / Dimension: Tolerance within PCB footprint compatibility (0.335" Dia ± tolerance, height variation acceptable if within board clearance)
• Operating Temperature Range: Substitute range must encompass or equal the minimum required operating window
• DC Cold Resistance: Variation acceptable within electrical performance limits
• Melting I²t: Variation acceptable within fast-blow response classification
• Packaging Format: Tape & Box or Bulk acceptable for equivalent electrical performance

The substitute part 37312000410 (Littelfuse Inc., TR5® 373 series) meets all mandatory matching parameters and is therefore qualified as an equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

Primary Part Selection (SR-5F-2A-AP): The SR-5F-2A-AP remains the specified component when PSE approval is a mandatory requirement and operating temperatures consistently reach or exceed 85°C. This part carries active product status with established supply availability (977 units in stock).

Substitute Part Selection (37312000410): The Littelfuse 37312000410 is electrically and mechanically equivalent for applications where:

• Operating temperature does not exceed 85°C
• CSA and cULus certifications satisfy regulatory requirements (PSE certification not required)
• Higher inventory availability (2502 units) supports procurement timelines
• Slightly lower DC cold resistance (0.03857 Ohms vs. 0.058 Ohms) is acceptable within circuit design parameters

Both parts carry active product status and RoHS compliance. The physical dimension difference (0.004" height) is negligible for standard PCB through-hole assembly.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 37312000410 be used in place of the Eaton SR-5F-2A-AP?

A: Yes, for applications where operating temperature remains below 85°C and PSE certification is not required. All critical electrical parameters (2 A current rating, 250 V AC voltage, fast-blow response, 50 A breaking capacity) are identical. Physical dimensions are compatible with standard PCB footprints.

Q: What is the significance of the different Melting I²t values (9 vs. 0.63)?

A: Both parts are classified as fast-blow fuses. The Melting I²t value represents the thermal energy required to melt the fuse element. Different values reflect different fuse element designs within the fast-blow category. Both parts meet the fast-blow response time specification for this application.

Q: Does the lower DC Cold Resistance of the Littelfuse part affect circuit performance?

A: The Littelfuse part has lower DC cold resistance (0.03857 Ohms vs. 0.058 Ohms). This difference is acceptable within standard circuit design tolerances and does not compromise protection characteristics. Verify circuit design parameters if resistance-sensitive applications are involved.

Q: Why is the operating temperature range different between the two parts?

A: The Eaton SR-5F-2A-AP operates to 125°C, while the Littelfuse 37312000410 operates to 85°C. Select the Eaton part for high-temperature applications. For standard industrial environments (typically -40°C to 85°C), both parts are suitable.

Q: Are there packaging differences between these parts?

A: Yes. The SR-5F-2A-AP is supplied in Tape & Box (TB) format, while the 37312000410 is supplied in Bulk packaging. Verify packaging requirements for your procurement and assembly processes.

Q: What certifications does each part carry?

A: SR-5F-2A-AP: cULus, PSE. 37312000410: CSA, cULus. If PSE certification is mandatory for your application, use the Eaton part. If CSA and cULus are sufficient, either part is acceptable.

Q: Are both parts currently in production?

A: Yes. Both parts carry Active product status. The Littelfuse part has higher inventory availability (2502 units vs. 977 units).