Littelfuse 0452008.MRSN Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0452008.MRSN is an 8A 72VAC surface mount board mount fuse in the NANO²® 452 series, designed for circuit protection in applications requiring slow-blow response characteristics. This fuse is manufactured in a 2-SMD square end block package and is actively produced with full stock availability. Equivalent and substitute parts are identified to support procurement flexibility, alternative packaging requirements, and supply chain continuity for this critical protection component.

Substiute Parts

0452008.MRSN

Littelfuse Inc.In Stock: 16710452008.MRSN Datasheet

Current PartRFQ

0452008.MRL

Littelfuse Inc.In Stock: 205090452008.MRL Datasheet

Parametric EquivalentRFQ

0454008.MR

Littelfuse Inc.In Stock: 29590454008.MR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0452008.MRSN are identified based on electrical equivalence and mechanical compatibility. The primary substitution criteria are:

• Current Rating: 8 A (exact match required)
• Voltage Rating - AC: 72 V (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Surface Mount (exact match required)
• Package / Case: 2-SMD, Square End Block (exact match required)
• Breaking Capacity: 50 A (exact match required)
• Melting I²t: 137.34 (exact match required)
• Operating Temperature Range: -55°C to 125°C (exact match required)
• Physical Dimensions: 0.240" L x 0.106" W x 0.106" H (exact match required)

The identified substitutes differ in packaging format (Tape & Reel versus Cut Tape / Digi-Reel®) and series designation (NANO²® 452 versus NANO²® 454), with one substitute adding DC voltage rating specification (60 V DC). These variations do not affect electrical performance or mechanical fit in the target application.

Parameter Comparison

Engineering Selection Recommendations

All three parts—0452008.MRSN, 0452008.MRL, and 0454008.MR—are active products manufactured by Littelfuse Inc. with full regulatory compliance. Selection between these parts is determined by packaging and supply requirements rather than electrical performance.

The 0452008.MRSN and 0452008.MRL are both NANO²® 452 series components supplied in Tape & Reel format, with identical electrical and mechanical specifications. The 0452008.MRL provides additional DC voltage rating documentation (60 V DC) alongside the AC rating.

The 0454008.MR is a NANO²® 454 series equivalent supplied in Cut Tape and Digi-Reel® format. This part maintains electrical equivalence and identical physical dimensions but differs in series designation and packaging configuration. Approval agencies differ slightly: the 0454008.MR carries CSA and UL certification, while the 0452008.MRSN and 0452008.MRL carry CSA and UR certification.

All parts meet ROHS3 compliance and operate across the -55°C to 125°C temperature range. Selection should be based on procurement packaging preferences, supply availability, and specific certification requirements for the target application.

Frequently Asked Questions (FAQ)

Q: Can the 0452008.MRL be used as a direct replacement for the 0452008.MRSN?

A: Yes. Both parts are NANO²® 452 series components with identical current rating (8 A), AC voltage rating (72 V), response time (Slow Blow), package type (2-SMD, Square End Block), breaking capacity (50 A), melting I²t (137.34), operating temperature range (-55°C to 125°C), and physical dimensions (0.240" L x 0.106" W x 0.106" H). The primary difference is packaging format (both Tape & Reel) and the addition of DC voltage rating specification on the 0452008.MRL.

Q: Can the 0454008.MR be used as a direct replacement for the 0452008.MRSN?

A: Yes. The 0454008.MR maintains electrical equivalence and identical physical dimensions. The differences are series designation (NANO²® 454 versus NANO²® 452), packaging format (Cut Tape & Digi-Reel® versus Tape & Reel), and certification agencies (CSA, UL versus CSA, UR). Electrical performance and mechanical fit are equivalent.

Q: What is the difference between Tape & Reel and Cut Tape / Digi-Reel® packaging?

A: Tape & Reel packaging supplies components on a continuous reel suitable for high-volume automated assembly. Cut Tape & Digi-Reel® packaging provides components in smaller quantities on cut tape segments or alternative reel formats, suitable for lower-volume applications or mixed-component orders.

Q: Are all three parts RoHS compliant?

A: Yes. All three parts—0452008.MRSN, 0452008.MRL, and 0454008.MR—are ROHS3 compliant.

Q: What certifications apply to each part?

A: The 0452008.MRSN and 0452008.MRL carry CSA and UR approval. The 0454008.MR carries CSA and UL approval. All parts meet the specified regulatory requirements for their respective applications.

Q: Does the addition of DC voltage rating on the 0452008.MRL affect compatibility?

A: No. The 0452008.MRL specifies 60 V DC in addition to the 72 V AC rating. This additional specification does not affect compatibility with applications designed for the 0452008.MRSN, which operates at 72 V AC.