MS 2.5TR Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The MS 2.5TR is a 2.5 A, 125 V AC/DC board mount fuse manufactured by Bel Fuse Inc. in axial package configuration. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. The fuse is designed for through-hole mounting applications requiring slow-blow response characteristics and operates across a temperature range of -55°C to 125°C.

Substiute Parts

MS 2.5TR

Bel Fuse Inc.In Stock: 1085MS 2.5TR Datasheet

Current PartRFQ

0034.6821

SCHURTER Inc.In Stock: 14860034.6821 Datasheet

DirectRFQ

047302.5MRT1L

Littelfuse Inc.In Stock: 4766047302.5MRT1L Datasheet

DirectRFQ

047302.5YRT1L

Littelfuse Inc.In Stock: 1077047302.5YRT1L Datasheet

DirectRFQ

047102.5NRT1L

Littelfuse Inc.In Stock: 1015047102.5NRT1L Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MS 2.5TR are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes (Identical Electrical & Mechanical Parameters):

• 047302.5MRT1L (Littelfuse Inc., PICO® II 473 series)
• 047302.5YRT1L (Littelfuse Inc., PICO® II 473 series)

These parts maintain identical current rating (2.5 A), voltage ratings (125 V AC/DC), response time (Slow Blow), package type (Axial), and breaking capacity (50A AC). Both are active products with current manufacturing status and full compliance certifications.

Similar Substitute (Equivalent Electrical, Different Mechanical Parameters):

• 047102.5NRT1L (Littelfuse Inc., PICO® II 471 series)

This part matches the electrical specifications (2.5 A, 125 V AC/DC, Slow Blow, 50A breaking capacity) but differs in physical dimensions and melting I²t characteristics. The axial package remains consistent with the original design.

Non-Equivalent Substitute (Different Current Rating):

• 0034.6821 (SCHURTER Inc., MST 250 series)

This part operates at 4 A current rating with 250 V AC capability, representing a different electrical class and is included for reference only where current rating adjustment is acceptable in the application.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Recommended):

047302.5MRT1L and 047302.5YRT1L are the primary substitutes for MS 2.5TR applications. Both are manufactured by Littelfuse Inc. under the PICO® II 473 series and maintain identical electrical specifications. The distinction between these two parts is packaging format: 047302.5MRT1L is supplied in Cut Tape (CT) configuration, while 047302.5YRT1L is supplied in Tape & Reel (TR) format. Selection between these two depends on procurement and assembly requirements. Both parts carry active product status with current manufacturing support and hold CSA, PSE, and UR certifications, ensuring regulatory compliance for most applications.

For Applications Requiring Smaller Physical Dimensions:

047102.5NRT1L (PICO® II 471 series) provides an alternative when board space constraints require reduced component size. This part maintains the 2.5 A, 125 V AC/DC electrical specification but features a smaller diameter (0.110" vs. 0.125" for MS 2.5TR) and lower melting I²t (4.39 vs. 6). This part is suitable only where the reduced thermal mass does not conflict with circuit protection requirements.

For Higher Voltage AC Applications:

0034.6821 (SCHURTER Inc., MST 250 series) is applicable only where the circuit design permits a 4 A current rating and requires 250 V AC capability. This part represents a different electrical class and should be selected only when application requirements explicitly allow for increased current rating and higher AC voltage tolerance.

Frequently Asked Questions (FAQ)

Q: Can 047302.5MRT1L and 047302.5YRT1L be used interchangeably?

A: Yes. Both parts are electrically and mechanically identical. The difference is packaging format: Cut Tape (CT) versus Tape & Reel (TR). Selection depends on assembly line equipment and procurement volume requirements. Both are active products with equivalent certifications.

Q: Is 047102.5NRT1L a direct replacement for MS 2.5TR?

A: 047102.5NRT1L is electrically equivalent but mechanically different. It has a smaller diameter (0.110" vs. 0.125") and different melting I²t (4.39 vs. 6). Use this part only if board layout permits the smaller size and thermal response characteristics are acceptable for the application.

Q: Why is 0034.6821 listed as a substitute if it has a different current rating?

A: 0034.6821 is included for reference in applications where circuit design allows for a 4 A current rating and 250 V AC operation. This part is not a direct substitute and should be selected only when application requirements explicitly support the higher current and voltage ratings.

Q: What certifications should I verify for my specific application?

A: The Littelfuse substitutes (047302.5MRT1L, 047302.5YRT1L, 047102.5NRT1L) carry CSA, PSE, and UR certifications. The original MS 2.5TR carries CE, CSA, and cURus certifications. Verify that the selected substitute meets all regulatory requirements for your target market and application.

Q: Are the Littelfuse substitutes RoHS compliant?

A: Yes. All three Littelfuse substitutes (047302.5MRT1L, 047302.5YRT1L, 047102.5NRT1L) are ROHS3 compliant, supporting modern manufacturing and environmental compliance requirements.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) packaging is suitable for lower-volume applications and manual assembly. Tape & Reel (TR) packaging is optimized for high-volume automated assembly lines. Both formats contain identical components; the choice depends on production volume and assembly equipment.