MS 5TR Board Mount Axial Fuse - Equivalent & Substitute Parts

Part Overview

The MS 5TR is a 5 A, 125 V AC/DC board mount axial fuse manufactured by Bel Fuse Inc. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. 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.

Key Parameters

Parameter	MS 5TR Specification
Current Rating	5 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Slow Blow
Mounting Type	Through Hole
Fuse Type	Board Mount (Cartridge Style Excluded)
Package / Case	Axial
Breaking Capacity @ Rated Voltage	50 A AC, 300 A DC
Operating Temperature Range	-55°C to 125°C
Size / Dimension	0.125" Dia x 0.280" L (3.18 mm x 7.10 mm)
DC Cold Resistance	0.02 Ohms

Substitute Part Grouping Explanation

Substitution eligibility for the MS 5TR is determined by the following critical parameters:

Current Rating: 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)
Fuse Type: Board Mount, Axial configuration (exact match required)
Operating Temperature Range: -55°C to 125°C (minimum requirement)

Direct substitutes maintain identical electrical and mechanical specifications. Similar substitutes may vary in physical dimensions, melting I²t characteristics, or series designation while preserving core functional parameters.

Parameter Comparison

Parameter	MS 5TR (Bel Fuse)	0473005.MRT1L (Littelfuse)	0473005.YRT1L (Littelfuse)	0471005.NRT1L (Littelfuse)
Current Rating (A)	5	5	5	5
Voltage Rating AC (V)	125	125	125	125
Voltage Rating DC (V)	125	125	125	125
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Fuse Type	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)
Package / Case	Axial	Axial	Axial	Axial
Breaking Capacity @ Rated Voltage	50 A AC, 300 A DC	50 A	50 A	50 A
Operating Temperature Range	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C
Size / Dimension	0.125" Dia x 0.280" L (3.18 mm x 7.10 mm)	0.135" Dia x 0.280" L (3.43 mm x 7.11 mm)	0.135" Dia x 0.280" L (3.43 mm x 7.11 mm)	0.110" Dia x 0.280" L (2.80 mm x 7.11 mm)
DC Cold Resistance (Ohms)	0.02	0.0133	0.0133	0.008
Product Status	Obsolete	Active	Active	Active
Approval Agency	CE, CSA, cURus	CSA, PSE, UR	CSA, PSE, UR	PSE, UR
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The MS 5TR is obsolete and no longer available from the original manufacturer. Active substitute options are available from Littelfuse Inc., all rated for identical electrical specifications (5 A, 125 V AC/DC, Slow Blow response).

0473005.MRT1L and 0473005.YRT1L are direct functional equivalents from the PICO® II 473 series. Both maintain the required current rating, voltage rating, and response time. These parts carry CSA and UR certifications and are ROHS3 compliant. Physical dimensions differ slightly (0.135" diameter versus 0.125"), which must be verified for PCB layout compatibility.

0471005.NRT1L is from the PICO® II 471 series and functions as a similar substitute. It maintains all critical electrical parameters but has a smaller physical diameter (0.110") and different melting I²t characteristic (15.4 versus 33). This part carries PSE and UR certifications and is ROHS3 compliant. Physical dimension differences require PCB layout verification.

All substitute parts support the full operating temperature range of -55°C to 125°C and maintain through-hole axial mounting compatibility.

Frequently Asked Questions (FAQ)

Q: Can 0473005.MRT1L or 0473005.YRT1L be used as direct replacements for MS 5TR?

A: Yes. Both parts match the MS 5TR in current rating (5 A), voltage rating (125 V AC/DC), response time (Slow Blow), mounting type (Through Hole), and fuse type (Board Mount Axial). Physical diameter increases from 0.125" to 0.135", requiring verification that PCB pad spacing accommodates the larger component.

Q: What is the difference between 0473005.MRT1L and 0473005.YRT1L?

A: Both parts are electrically and mechanically identical. They differ only in packaging designation (MRT1L versus YRT1L) and inventory availability. Selection between them is based on procurement and supply chain requirements.

Q: Can 0471005.NRT1L replace MS 5TR?

A: 0471005.NRT1L maintains identical electrical specifications (5 A, 125 V AC/DC, Slow Blow) and mounting type. However, it has a smaller physical diameter (0.110" versus 0.125") and different melting I²t (15.4 versus 33). PCB layout compatibility must be verified before substitution.

Q: What certifications apply to the substitute parts?

A: 0473005.MRT1L and 0473005.YRT1L carry CSA, PSE, and UR certifications. 0471005.NRT1L carries PSE and UR certifications. All are ROHS3 compliant. Verify that required certifications for your application are present in the selected substitute.

Q: Are there any DC cold resistance differences between MS 5TR and the substitutes?

A: Yes. MS 5TR has 0.02 Ohms DC cold resistance. 0473005.MRT1L and 0473005.YRT1L have 0.0133 Ohms. 0471005.NRT1L has 0.008 Ohms. These differences may affect circuit behavior in low-resistance applications and should be evaluated against circuit design requirements.

Q: What is the breaking capacity of the substitute parts?

A: 0473005.MRT1L, 0473005.YRT1L, and 0471005.NRT1L all have a breaking capacity of 50 A at rated voltage. The MS 5TR specifies 50 A AC and 300 A DC. Verify that 50 A breaking capacity meets your application requirements.

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