Littelfuse 0451015.NRL Surface Mount Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0451015.NRL is a 15 A, 65 V AC/DC surface mount board mount fuse in the NANO²® 451 series. This fast-blow fuse is designed for circuit protection in applications requiring compact SMD packaging with 2-SMD, Square End Block configuration. The part is active in production status and widely stocked, with 1,775 pieces available in Tape & Reel packaging. Equivalent and substitute parts are identified to support design flexibility, procurement optimization, and supply chain continuity.

Key Parameters

Parameter	Value
Current Rating	15 A
Voltage Rating (AC)	65 V
Voltage Rating (DC)	65 V
Response Time	Fast Blow
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)
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant
Approval Agencies	CSA, UL

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment of electrical and mechanical parameters. The primary substitution criteria are:

Current Rating: 15 A (exact match required)
Voltage Rating: 65 V AC and 65 V DC minimum (equal or higher acceptable)
Response Time: Fast Blow (exact match required)
Mounting Type: Surface Mount (exact match required)
Package / Case: 2-SMD, Square End Block (exact match required)
Size / Dimension: 0.240" L x 0.106" W x 0.106" H or equivalent (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
RoHS Status: ROHS3 Compliant (exact match required)

Parametric equivalents (0451015.MRL, 0451015.MRSN, 0453015.MR) meet all substitution criteria with identical electrical and mechanical specifications. The Bourns SF-2410F1500T-2 is classified as a direct manufacturer alternative with higher voltage rating (86 V AC/DC) and different breaking capacity, suitable for applications where voltage headroom is beneficial.

Parameter Comparison

Parameter	0451015.NRL	0451015.MRL	0451015.MRSN	0453015.MR	SF-2410F1500T-2
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Bourns Inc.
Current Rating (Amps)	15 A	15 A	15 A	15 A	15 A
Voltage Rating - AC	65 V	65 V	65 V	65 V	86 V
Voltage Rating - DC	65 V	65 V	65 V	65 V	86 V
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	2-SMD, Square End Block	2-SMD, Square End Block	2-SMD, Square End Block	2-SMD, Square End Block	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)	0.240" L x 0.106" W x 0.106" H (6.10mm x 2.69mm x 2.69mm)	0.240" L x 0.106" W x 0.106" H (6.10mm x 2.69mm x 2.69mm)	0.240" L x 0.106" W x 0.106" H (6.10mm x 2.69mm x 2.69mm)	0.240" L x 0.102" W x 0.102" H (6.10mm x 2.59mm x 2.59mm)
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CSA, UL	CSA, UL	CSA, METI, UR	CSA, UL	cUL, UL
Packaging	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)
Inventory (Pcs)	1,775	27,700	150,100	13,200	7,710

Engineering Selection Recommendations

Littelfuse 0451015.MRL is a parametric equivalent with identical electrical and mechanical specifications. It differs only in packaging format (Cut Tape & Digi-Reel® versus Tape & Reel). Selection is appropriate when Cut Tape or Digi-Reel® packaging is preferred for manufacturing processes. Inventory availability is significantly higher at 27,700 pieces.

Littelfuse 0451015.MRSN is a parametric equivalent with identical electrical and mechanical specifications and Tape & Reel packaging matching the main part. Breaking capacity is rated at 100 A AC and 150 A DC, compared to 50 A for the main part. Approval agencies include CSA, METI, and UR. Inventory availability is the highest at 150,100 pieces, supporting high-volume procurement requirements.

Littelfuse 0453015.MR is a parametric equivalent from the NANO²® 453 series with identical electrical and mechanical specifications. It differs only in series designation and packaging format (Cut Tape & Digi-Reel®). Selection is appropriate when 453 series compatibility is required or when Cut Tape packaging is preferred.

Bourns SF-2410F1500T-2 is a direct manufacturer alternative from the SinglFuse™ SF-2410F-T series with identical current rating and response time. Voltage rating is higher at 86 V AC/DC, providing additional voltage margin. Breaking capacity is significantly higher at 200 A. Physical dimensions are marginally smaller (0.102" W x 0.102" H versus 0.106" W x 0.106" H). Approval agencies are cUL and UL. REACH status is affected, whereas the main part is REACH unaffected. Selection is appropriate for applications requiring higher voltage rating or breaking capacity.

Frequently Asked Questions (FAQ)

Q: Can 0451015.MRL be used as a direct replacement for 0451015.NRL?

A: Yes. Both parts are parametric equivalents with identical current rating (15 A), voltage ratings (65 V AC/DC), response time (Fast Blow), mounting type (Surface Mount), package configuration (2-SMD, Square End Block), physical dimensions, operating temperature range, and RoHS compliance. The only difference is packaging format: 0451015.MRL is supplied in Cut Tape & Digi-Reel®, while 0451015.NRL is supplied in Tape & Reel.

Q: What is the difference between 0451015.MRSN and 0451015.NRL?

A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The primary difference is breaking capacity: 0451015.MRSN is rated at 100 A AC and 150 A DC, while 0451015.NRL is rated at 50 A. Additionally, 0451015.MRSN includes METI approval in addition to CSA and UL. Inventory availability for 0451015.MRSN is substantially higher.

Q: Is the Bourns SF-2410F1500T-2 compatible with applications designed for 0451015.NRL?

A: The Bourns SF-2410F1500T-2 is compatible for applications where the circuit voltage does not exceed 65 V AC/DC. The Bourns part has a higher voltage rating (86 V AC/DC), higher breaking capacity (200 A), and marginally smaller physical dimensions (0.102" versus 0.106" width and height). REACH status differs: SF-2410F1500T-2 is REACH affected. Verify that the higher voltage rating and breaking capacity do not introduce unintended circuit behavior before substitution.

Q: What packaging options are available for 15 A, 65 V fast-blow surface mount fuses in this form factor?

A: Littelfuse offers three packaging options for parametric equivalents: Tape & Reel (0451015.NRL, 0451015.MRSN), and Cut Tape & Digi-Reel® (0451015.MRL, 0453015.MR). Bourns SF-2410F1500T-2 is supplied in Tape & Reel. Selection depends on manufacturing process requirements and procurement volume.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts, including 0451015.MRL, 0451015.MRSN, 0453015.MR, and SF-2410F1500T-2, are ROHS3 compliant.

Q: What are the approval agency differences among the substitute parts?

A: 0451015.NRL, 0451015.MRL, and 0453015.MR are approved by CSA and UL. 0451015.MRSN is approved by CSA, METI, and UR. SF-2410F1500T-2 is approved by cUL and UL. Selection should align with regional regulatory requirements and end-application certifications.

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