Littelfuse 0476004.MRSN Surface Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0476004.MRSN is a 4 A, 250 V AC / 125 V DC surface mount board fuse in the NANO²®476 series. This fast-blow fuse is designed for circuit protection in surface mount applications with a 2-SMD square end block package. The part is currently active in production with ROHS3 compliance and cURus approval certification.

Substitute parts are identified when they maintain identical electrical ratings, mechanical dimensions, and functional characteristics within the same product series and packaging specification.

Substiute Parts

0476004.MRSN

Littelfuse Inc.In Stock: 20470476004.MRSN Datasheet

Current PartRFQ

0476004.MR

Littelfuse Inc.In Stock: 51820476004.MR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The substitute part 0476004.MR is classified as a parametric equivalent to the main part 0476004.MRSN. This substitution is valid based on the following criteria:

Identical Electrical Parameters:

• Current Rating: 4 A
• Voltage Rating - AC: 250 V
• Voltage Rating - DC: 125 V
• Response Time: Fast Blow
• Breaking Capacity @ Rated Voltage: 100 A AC, 300 A DC
• Melting I²t: 2.82
• DC Cold Resistance: 0.01839 Ohms

Identical Mechanical Parameters:

• Mounting Type: Surface Mount
• Package / Case: 2-SMD, Square End Block
• Size / Dimension: 0.240" L x 0.106" W x 0.106" H (6.10mm x 2.69mm x 2.69mm)

Identical Compliance & Certification:

• Series: NANO²®476
• Approval Agency: cURus
• RoHS Status: ROHS3 Compliant
• Operating Temperature Range: -55°C ~ 125°C

Both parts are manufactured by Littelfuse Inc. and maintain active product status.

Parameter Comparison

Engineering Selection Recommendations

Both the 0476004.MRSN and 0476004.MR are functionally and mechanically interchangeable. Selection between these parts should be based on:

Availability: The 0476004.MR maintains higher inventory levels (5106 pcs) compared to the 0476004.MRSN (1971 pcs), making it the preferred choice when supply continuity is a consideration.

Compliance Assurance: Both parts carry identical cURus certification and ROHS3 compliance status, ensuring regulatory requirements are met regardless of which part is selected.

Packaging Format: Both parts are supplied in Tape & Reel (TR) packaging, maintaining consistency in automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can 0476004.MR be used as a direct replacement for 0476004.MRSN?

A: Yes. Both parts are parametric equivalents with identical electrical ratings (4 A, 250 V AC / 125 V DC), mechanical dimensions (0.240" L x 0.106" W x 0.106" H), response characteristics (Fast Blow), and certifications (cURus, ROHS3). They are functionally interchangeable in all applications.

Q: Are there any differences in the package or mounting between these parts?

A: No. Both parts use the same 2-SMD square end block package and surface mount configuration. PCB footprints and assembly processes remain identical.

Q: What is the significance of the melting I²t value of 2.82?

A: The melting I²t value defines the thermal energy required to melt the fuse element. This value is identical for both parts, ensuring identical thermal response and protection characteristics in the circuit.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both 0476004.MRSN and 0476004.MR carry cURus approval and are ROHS3 compliant. They meet identical regulatory and environmental requirements.

Q: What is the operating temperature range for these fuses?

A: Both parts operate across the range of -55°C to 125°C, maintaining consistent performance across industrial and commercial temperature environments.

Q: Is there a difference in DC cold resistance between the two parts?

A: No. Both parts have identical DC cold resistance of 0.01839 Ohms, ensuring equivalent circuit behavior and voltage drop characteristics.