MRF 2-AMMO Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The MRF 2-AMMO is a 2A 250VAC board mount fuse manufactured by Bel Fuse Inc., designed for through-hole radial mounting in vertical orientation. This fast-blow fuse is rated for 250V AC/DC operation with a breaking capacity of 35A at rated voltage. The part is currently active in production with 924 units in stock. Equivalent and substitute parts are identified when they share identical electrical ratings, mechanical compatibility, and mounting characteristics while maintaining compliance with applicable standards.

Substiute Parts

MRF 2-AMMO

Bel Fuse Inc.In Stock: 968MRF 2-AMMO Datasheet

Current PartRFQ

37312000410

Littelfuse Inc.In Stock: 260037312000410 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MRF 2-AMMO is determined by the following critical parameters:

• Current Rating: 2 A (exact match required)
• Voltage Rating: 250 V AC (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)
• Fuse Type: Board Mount (Cartridge Style Excluded) (exact match required)

The substitute part 37312000410 (Littelfuse Inc., TR5® 373 series) meets all critical electrical and mechanical parameters. Both parts are active products with current production status and ROHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

Both the MRF 2-AMMO and 37312000410 are active production parts with ROHS3 compliance and current inventory availability. Selection between these parts should be based on the following factors:

The MRF 2-AMMO provides a broader operating temperature range (-55°C ~ 125°C) and more extensive approval certifications including AEC-Q200, CE, PSE, SEMKO, and VDE. This part is suitable for applications requiring automotive qualification or extended temperature operation.

The 37312000410 offers a higher breaking capacity (50A versus 35A) and is available in bulk packaging. This part is suitable for applications where higher fault current handling is required and where CSA and cULus certifications are sufficient.

Physical dimensions differ slightly between the two parts. The 37312000410 has marginally larger diameter and height specifications (0.335" Dia x 0.315" H versus 0.329" Dia x 0.303" H). PCB layout and mounting hole spacing must accommodate these dimensional variations.

Frequently Asked Questions (FAQ)

Q: Can the 37312000410 directly replace the MRF 2-AMMO in all applications?

A: Both parts share identical electrical ratings (2A, 250V AC, Fast Blow) and mounting type (Through Hole, Radial, Can, Vertical). However, the operating temperature range differs (MRF 2-AMMO: -55°C ~ 125°C; 37312000410: -40°C ~ 85°C). Applications requiring operation below -40°C or above 85°C must use the MRF 2-AMMO. Physical dimensions vary slightly; verify PCB layout compatibility.

Q: What are the key differences in certifications?

A: The MRF 2-AMMO carries AEC-Q200, CE, CSA, cULus, PSE, SEMKO, and VDE approvals. The 37312000410 carries CSA and cULus approvals. Applications requiring automotive qualification (AEC-Q200) or specific regional certifications must use the MRF 2-AMMO.

Q: How do the breaking capacities differ?

A: The MRF 2-AMMO has a breaking capacity of 35A at rated voltage, while the 37312000410 has 50A. The 37312000410 provides higher fault current handling capability. Both parts are suitable for standard board mount fuse applications; selection depends on circuit fault current levels.

Q: Are there packaging differences?

A: The MRF 2-AMMO is supplied in Tape & Box (TB) packaging. The 37312000410 is supplied in Bulk packaging. Tape & Box packaging is typically used for automated assembly processes, while Bulk packaging is used for manual assembly or reel-based handling.

Q: What is the impact of the dimensional differences?

A: The 37312000410 is slightly larger (0.335" Dia x 0.315" H) compared to the MRF 2-AMMO (0.329" Dia x 0.303" H). These differences are within typical manufacturing tolerances for radial can fuses. Verify that PCB mounting holes and surrounding component placement accommodate the larger dimensions before substitution.