MS 1.5TR Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The MS 1.5TR is a 1.5 A, 125 V AC/DC board mount fuse manufactured by Bel Fuse Inc. in axial package configuration. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The fuse is designed for through-hole mounting applications requiring slow-blow response characteristics with a breaking capacity of 50 A AC and 300 A DC at rated voltage.

Substiute Parts

MS 1.5TR

Bel Fuse Inc.In Stock: 835MS 1.5TR Datasheet

Current PartRFQ

0034.6031

SCHURTER Inc.In Stock: 20940034.6031 Datasheet

DirectRFQ

047301.5MRT1L

Littelfuse Inc.In Stock: 2165047301.5MRT1L Datasheet

DirectRFQ

047301.5YRT1L

Littelfuse Inc.In Stock: 16265047301.5YRT1L Datasheet

DirectRFQ

047201.5NRT1L

Littelfuse Inc.In Stock: 1004047201.5NRT1L Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the MS 1.5TR is determined by the following critical parameters:

• Current Rating: 1.5 A (exact match required)
• Voltage Rating: 125 V AC and 125 V DC (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package Configuration: Axial (preferred for form factor compatibility)
• Breaking Capacity: Minimum 50 A AC at rated voltage

Substitute parts are classified into two categories:

Direct Substitutes (047301.5MRT1L, 047301.5YRT1L): Littelfuse PICO® II 473 series fuses that match all critical electrical parameters and maintain axial package configuration. These parts are active products with RoHS3 compliance.

Similar Substitute (047201.5NRT1L): Littelfuse PICO® II 472 series fuse that matches all critical electrical parameters but differs in physical dimensions and series designation. This part is active and suitable where space constraints permit.

Non-Equivalent Part (0034.6031): SCHURTER MSF 250 fuse with significantly different electrical specifications (50 mA current rating, 250 V AC rating, radial package, fast-blow response). This part does not meet substitution criteria for the MS 1.5TR.

Parameter Comparison

Engineering Selection Recommendations

Preferred Direct Substitutes: 047301.5MRT1L (Cut Tape packaging) and 047301.5YRT1L (Tape & Reel packaging) are the primary alternatives to the obsolete MS 1.5TR. Both are Littelfuse PICO® II 473 series fuses with active product status, RoHS3 compliance, and full electrical parameter equivalence. Selection between these two depends on procurement packaging requirements: Cut Tape for lower-volume applications or Tape & Reel for automated assembly processes.

Alternative Substitute: 047201.5NRT1L (Littelfuse PICO® II 472 series) provides electrical equivalence with identical current, voltage, and response time ratings. This part differs in physical dimensions (0.110" diameter versus 0.135" diameter) and DC cold resistance (0.039 Ohms versus 0.116 Ohms). This substitute is suitable for applications where reduced physical footprint is beneficial and lower resistance characteristics are acceptable.

Compliance Considerations: The Littelfuse substitutes maintain CSA and UR certifications, which overlap with the original part's approval agencies. Verify that PSE certification (present in 047301.5MRT1L and 047301.5YRT1L) meets application requirements if not previously specified.

Frequently Asked Questions (FAQ)

Q: Can the 0034.6031 SCHURTER fuse be used as a substitute for the MS 1.5TR?

A: No. The 0034.6031 has a current rating of 50 mA, voltage rating of 250 V AC, and fast-blow response time. These parameters do not match the MS 1.5TR requirements of 1.5 A, 125 V AC/DC, and slow-blow response. This part is not electrically equivalent.

Q: What is the difference between 047301.5MRT1L and 047301.5YRT1L?

A: Both parts are electrically and mechanically identical Littelfuse PICO® II 473 fuses. The difference is packaging: 047301.5MRT1L is supplied in Cut Tape (CT), while 047301.5YRT1L is supplied in Tape & Reel (TR). Select based on assembly process requirements and order quantities.

Q: How does the 047201.5NRT1L differ from the direct substitutes?

A: The 047201.5NRT1L is a PICO® II 472 series fuse with identical electrical ratings but smaller physical dimensions (0.110" diameter versus 0.135" diameter) and lower DC cold resistance (0.039 Ohms versus 0.116 Ohms). It is suitable for space-constrained applications where the reduced resistance is acceptable.

Q: Are the Littelfuse substitutes compatible with the original MS 1.5TR certifications?

A: The Littelfuse substitutes carry CSA and UR certifications, which overlap with the MS 1.5TR's CE, CSA, and cURus approvals. Verify that the specific certifications required for your application are present in the selected substitute part.

Q: What is the melting I²t specification and why does it vary among substitutes?

A: Melting I²t is a thermal characteristic that defines the energy required to melt the fuse element. The MS 1.5TR has a melting I²t of 1.9, while the Littelfuse substitutes have values of 3.94 (047301.5MRT1L, 047301.5YRT1L) and 2.4081 (047201.5NRT1L). These variations reflect different fuse element designs but do not affect functional equivalence for the specified 1.5 A slow-blow application.

Q: Can I use these substitutes in high-temperature applications?

A: All substitute parts maintain the operating temperature range of -55°C ~ 125°C, matching the MS 1.5TR specification. They are suitable for the same thermal environment.