MS 750TR Equivalent & Substitute Parts

Part Overview

The MS 750TR is a 750 mA, 125 V AC/DC board mount axial fuse manufactured by Bel Fuse Inc. with slow blow response characteristics. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. Substitute parts must maintain identical electrical ratings, mechanical compatibility, and approval certifications to ensure direct interchangeability in existing circuit designs.

Substiute Parts

MS 750TR

Bel Fuse Inc.In Stock: 1093MS 750TR Datasheet

Current PartRFQ

0473.750MRT1L

Littelfuse Inc.In Stock: 39480473.750MRT1L Datasheet

DirectRFQ

0473.750YRT1L

Littelfuse Inc.In Stock: 322150473.750YRT1L Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MS 750TR is determined by strict equivalence across the following parameters:

• Current Rating: 750 mA (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)
• Fuse Type: Board Mount, Axial configuration (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Breaking Capacity @ Rated Voltage: 50A AC minimum (exact match required)

The two substitute parts listed—0473.750MRT1L and 0473.750YRT1L, both from Littelfuse Inc. PICO® II 473 series—meet all mandatory electrical and mechanical parameters. Both are active products with current manufacturing status, providing long-term availability compared to the obsolete MS 750TR.

Parameter Comparison

Engineering Selection Recommendations

Both 0473.750MRT1L and 0473.750YRT1L are qualified substitutes for the MS 750TR based on electrical and mechanical parameter equivalence. Selection between the two Littelfuse alternatives should be based on procurement availability and packaging requirements:

0473.750YRT1L is recommended as the primary substitute due to significantly higher inventory availability (32,200 pcs in stock versus 3,894 pcs for 0473.750MRT1L), ensuring supply chain continuity for production and repair applications.

Both substitute parts carry CSA and UR approvals, meeting regulatory requirements for the target application. The Littelfuse PICO® II 473 series components are ROHS3 compliant, providing environmental compliance advantages over the obsolete MS 750TR.

Minor dimensional variations exist between the original and substitute parts (diameter increases from 0.125" to 0.135"), requiring verification of PCB footprint clearance in space-constrained layouts. DC cold resistance is slightly lower in the Littelfuse parts (0.46 Ohms versus 0.55 Ohms), which is operationally favorable.

Frequently Asked Questions (FAQ)

Q: Can 0473.750MRT1L and 0473.750YRT1L be used interchangeably with MS 750TR?

A: Yes. Both parts meet all mandatory electrical parameters (750 mA, 125 V AC/DC, slow blow response) and mechanical specifications (through hole, axial package, -55°C ~ 125°C operating range). Both are direct substitutes.

Q: What is the difference between 0473.750MRT1L and 0473.750YRT1L?

A: Both parts are electrically and mechanically identical. The primary difference is packaging format (both supplied in Cut Tape) and inventory availability. 0473.750YRT1L has substantially higher stock levels.

Q: Will the slightly larger diameter of the Littelfuse parts affect PCB compatibility?

A: The diameter increases from 0.125" to 0.135". Verify that existing PCB footprints provide adequate clearance around the fuse mounting holes. The axial length remains equivalent at 0.280".

Q: Are the substitute parts compliant with current environmental regulations?

A: Yes. Both 0473.750MRT1L and 0473.750YRT1L are ROHS3 compliant and REACH unaffected, meeting current environmental standards.

Q: What certifications do the substitute parts carry?

A: Both Littelfuse parts carry CSA and UR approvals. The original MS 750TR carried CE, CSA, and cURus approvals. Verify that CSA and UR certifications satisfy your application requirements.