Littelfuse 0472003.NRT1L Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0472003.NRT1L is a 3 A, 125 V AC/DC board mount axial fuse in the PICO® II 472 series. This through-hole component is designed for circuit protection in applications requiring slow-blow response characteristics. The part is Active status and widely stocked. Substitute parts are identified to address packaging availability, inventory levels, and specific application requirements while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Current Rating	3 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Slow Blow
Mounting Type	Through Hole
Package / Case	Axial
Breaking Capacity @ Rated Voltage	50 A
Operating Temperature Range	-55°C to 125°C
Size / Dimension	0.110" Dia x 0.280" L (2.80mm x 7.11mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 0472003.NRT1L are qualified based on the following electrical and mechanical parameters:

Current Rating: 3 A (exact match required)
Voltage Rating: 125 V AC / 125 V DC (exact match required)
Response Time: Slow Blow (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Axial (exact match required)
Breaking Capacity: 50 A (exact match required)
Operating Temperature Range: -55°C to 125°C (exact match required)
Physical Dimensions: 0.110" Dia x 0.280" L (exact match required)
RoHS Compliance: ROHS3 Compliant (exact match required)

The primary difference between substitute parts is packaging format (Tape & Reel versus Cut Tape) and minor variations in DC Cold Resistance and Melting I²t values, which do not affect functional compatibility in standard circuit protection applications.

Parameter Comparison

Parameter	0472003.NRT1L (Main)	0472003.MRT1L (Substitute)	0471003.NRT1L (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Series	PICO® II 472	PICO® II 472	PICO® II 471
Current Rating (Amps)	3 A	3 A	3 A
Voltage Rating - AC	125 V	125 V	125 V
Voltage Rating - DC	125 V	125 V	125 V
Response Time	Slow Blow	Slow Blow	Slow Blow
Mounting Type	Through Hole	Through Hole	Through Hole
Fuse Type	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)
Package / Case	Axial	Axial	Axial
Breaking Capacity @ Rated Voltage	50 A	50 A	50 A
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Size / Dimension	0.110" Dia x 0.280" L (2.80mm x 7.11mm)	0.110" Dia x 0.280" L (2.80mm x 7.11mm)	0.110" Dia x 0.280" L (2.80mm x 7.11mm)
DC Cold Resistance	0.0187 Ohms	0.0187 Ohms	0.023 Ohms
Melting I²t	9.36	9.36	6.96
Packaging	Tape & Reel (TR)	Cut Tape (CT)	Cut Tape (CT)
Approval Agency	UR	UR	PSE, UR
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three parts are Active status products from Littelfuse Inc. and maintain full ROHS3 compliance. Selection between these equivalents is determined by packaging and supply requirements:

0472003.NRT1L (Tape & Reel): Primary specification. Use when reel packaging is required for automated assembly processes or when tape & reel inventory is available.

0472003.MRT1L (Cut Tape): Functionally identical to the main part with matching DC Cold Resistance (0.0187 Ohms) and Melting I²t (9.36). Packaging format differs. Use when cut tape format is preferred or when tape & reel stock is unavailable.

0471003.NRT1L (Cut Tape, PICO® II 471 Series): Maintains all critical electrical parameters (3 A, 125 V AC/DC, Slow Blow, 50 A breaking capacity). DC Cold Resistance is 0.023 Ohms and Melting I²t is 6.96, representing minor thermal characteristic variations. Includes PSE approval in addition to UR certification. Use when PICO® II 471 series compatibility is acceptable and cut tape packaging is required.

Frequently Asked Questions (FAQ)

Q: Can 0472003.MRT1L replace 0472003.NRT1L in production?

A: Yes. Both parts are identical in electrical and mechanical specifications. The difference is packaging format (Cut Tape versus Tape & Reel). Verify your assembly equipment compatibility with cut tape format before substitution.

Q: What is the difference between 0472003.NRT1L and 0471003.NRT1L?

A: Both are 3 A, 125 V AC/DC slow-blow fuses with identical mounting and physical dimensions. The 0471003.NRT1L belongs to the PICO® II 471 series and has slightly different thermal characteristics (DC Cold Resistance: 0.023 Ohms versus 0.0187 Ohms; Melting I²t: 6.96 versus 9.36). Both are functionally compatible for standard circuit protection applications.

Q: Are all three parts ROHS3 compliant?

A: Yes. All three parts meet ROHS3 compliance requirements.

Q: What packaging formats are available?

A: 0472003.NRT1L is supplied in Tape & Reel (TR) format. Both 0472003.MRT1L and 0471003.NRT1L are supplied in Cut Tape (CT) format.

Q: Which part has the highest inventory availability?

A: 0471003.NRT1L has the highest stock level at 6361 pieces. 0472003.NRT1L has 772 pieces, and 0472003.MRT1L has 1659 pieces.

Q: Are there approval agency differences between these parts?

A: 0472003.NRT1L and 0472003.MRT1L carry UR approval. 0471003.NRT1L carries both PSE and UR approvals, providing broader regional certification coverage.

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