MS 4.6 TR Equivalent & Substitute Parts

Part Overview

The MS 4.6 TR is a board mount axial fuse manufactured by Bel Fuse Inc., rated for 4.6 A at 125 V AC/DC with slow blow response characteristics. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings and mechanical compatibility to ensure reliable circuit protection without design modification.

Substiute Parts

MS 3.5 TR

Bel Fuse Inc.In Stock: 901MS 3.5 TR Datasheet

Current PartRFQ

047103.5NRT1L

Littelfuse Inc.In Stock: 1139047103.5NRT1L Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MS 4.6 TR is determined by strict equivalence across the following parameters:

• Current Rating: Must be exactly 4.6 A
• Voltage Rating: Must support minimum 125 V AC and 125 V DC
• Response Time: Must be Slow Blow
• Mounting Type: Must be Through Hole
• Package Style: Must be Axial
• Operating Temperature: Must support -55°C to 125°C range
• Fuse Type: Must be Board Mount (Cartridge Style Excluded)

The substitute part 047104.6NRT1L (Littelfuse Inc., PICO® II 471 series) meets all mandatory electrical and mechanical parameters, establishing direct functional equivalence despite differences in physical dimensions and packaging format.

Parameter Comparison

Engineering Selection Recommendations

The 047104.6NRT1L from Littelfuse Inc. is the qualified substitute for the obsolete MS 4.6 TR. Selection is based on:

• Electrical equivalence: Identical current, voltage, and response time ratings
• Mechanical compatibility: Through hole axial mounting with compatible board footprint
• Regulatory compliance: Both parts carry relevant international approvals (CE, CSA, cURus for original; PSE, UR for substitute)
• Product availability: The substitute is active production status with confirmed inventory, whereas the original is obsolete
• Environmental compliance: The substitute meets ROHS3 requirements, supporting modern manufacturing standards

Physical dimension differences (0.125" Dia x 0.280" L versus 0.110" Dia x 0.280" L) require PCB layout verification to confirm mechanical fit within existing mounting holes and clearance envelopes.

Frequently Asked Questions (FAQ)

Q: Can the 047104.6NRT1L be used as a direct replacement for MS 4.6 TR without PCB modification?

A: Electrical substitution is direct. Mechanical fit requires verification due to diameter difference (0.125" versus 0.110"). Existing through-hole spacing must accommodate the substitute's lead diameter.

Q: What are the key parameters that define substitution eligibility?

A: Current rating (4.6 A), voltage ratings (125 V AC/DC), response time (Slow Blow), mounting type (Through Hole), and package style (Axial) must match exactly. Operating temperature range and fuse type classification must also be equivalent.

Q: Why is the MS 4.6 TR obsolete?

A: Product status reflects manufacturer discontinuation. The 047104.6NRT1L represents the active equivalent from Littelfuse Inc.

Q: Are there compliance differences between the two parts?

A: Both parts carry international safety approvals. The substitute additionally meets ROHS3 compliance, which may be required for new designs or updated manufacturing standards.

Q: What is the significance of packaging format differences (bulk versus Tape & Reel)?

A: Packaging format affects supply chain logistics and automated assembly compatibility but does not impact electrical or mechanical performance. Component selection should consider manufacturing process requirements.