Equivalent & Substitute Parts for 0253003.NRT1L

Part Overview

The 0253003.NRT1L is a 3A 125VAC/VDC board mount axial fuse manufactured by Littelfuse Inc. as part of the PICO® II 253 series. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and procurement planning. The part features fast-blow response characteristics and is designed for through-hole axial mounting applications requiring reliable overcurrent protection in industrial and commercial electronics.

Key Parameters

Parameter	Value
Current Rating	3 A
Voltage Rating (AC)	125 V
Voltage Rating (DC)	125 V
Response Time	Fast Blow
Mounting Type	Through Hole
Fuse Type	Board Mount (Cartridge Style Excluded)
Package / Case	Axial
Breaking Capacity (AC)	50 A
Breaking Capacity (DC)	300 A
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the 0253003.NRT1L is determined by strict equivalence across the following critical parameters: current rating (3 A), AC voltage rating (125 V), DC voltage rating (125 V), response time (fast blow), mounting type (through hole), and fuse type classification (board mount, cartridge style excluded). The substitute parts identified maintain these core electrical specifications while differing in packaging format and manufacturer origin.

Two substitute relationships are established:

Parametric Equivalent (Same Manufacturer): The 0253003.NRT1 from Littelfuse Inc. maintains identical electrical and mechanical specifications to the main part, with the primary difference being packaging format (Tape & Reel versus bulk). This part is active in production status.

Direct Manufacturer Substitute (Cross-Manufacturer): The 7010.6400.13 from SCHURTER Inc. provides functional equivalence across all critical electrical parameters (3 A, 125 VAC/VDC, fast blow) and mounting configuration. Physical dimensions and melting I²t characteristics differ within acceptable tolerance for board-level applications.

Parameter Comparison

Parameter	0253003.NRT1L (Main)	0253003.NRT1 (Littelfuse)	7010.6400.13 (SCHURTER)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	SCHURTER Inc.
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	Fast Blow	Fast Blow	Fast 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	Cartridge, Non-Standard (Axial)
Breaking Capacity @ Rated Voltage (AC)	50 A	50 A	300 A
Breaking Capacity @ Rated Voltage (DC)	300 A	300 A	300 A
Melting I²t	1.19	1.19	2.4
Operating Temperature Range	-55°C to 125°C	-55°C to 125°C	-55°C to 85°C
Size / Dimension	0.103" Dia x 0.280" L (2.61mm x 7.11mm)	0.103" Dia x 0.280" L (2.61mm x 7.11mm)	0.093" Dia x 0.315" L (2.36mm x 8.00mm)
DC Cold Resistance	0.029 Ohms	0.029 Ohms	Not specified
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: The 0253003.NRT1 from Littelfuse Inc. is the preferred substitute for the obsolete 0253003.NRT1L. This part maintains complete electrical and mechanical equivalence, identical dimensional specifications, and matching thermal operating range. Both parts carry identical regulatory approvals (CCC, CSA, PSE, QPL, TUV, UR) and RoHS3 compliance. The only distinction is packaging format (Tape & Reel versus bulk), which does not affect functional performance. Active production status ensures long-term availability.

Secondary Recommendation: The 7010.6400.13 from SCHURTER Inc. serves as a cross-manufacturer substitute when Littelfuse parts are unavailable. This part meets all critical electrical specifications (3 A, 125 VAC/VDC, fast blow response) and maintains through-hole axial mounting compatibility. Physical dimensions differ slightly (0.093" Dia x 0.315" L versus 0.103" Dia x 0.280" L), requiring verification of PCB layout clearance. The elevated melting I²t value (2.4 versus 1.19) and reduced maximum operating temperature (-55°C to 85°C versus -55°C to 125°C) must be evaluated against specific application thermal requirements. RoHS3 compliance is confirmed.

Frequently Asked Questions (FAQ)

Q: Can the 0253003.NRT1 directly replace the 0253003.NRT1L without PCB modification?

A: Yes. The 0253003.NRT1 is dimensionally and electrically identical to the 0253003.NRT1L. No PCB layout changes are required. The difference in packaging format (Tape & Reel versus bulk) does not affect component performance or mounting.

Q: What are the key differences between the Littelfuse 0253003.NRT1 and SCHURTER 7010.6400.13?

A: Both parts share identical current rating (3 A), voltage ratings (125 VAC/VDC), and response time (fast blow). Differences include: physical dimensions (SCHURTER is slightly smaller in diameter but longer), melting I²t (SCHURTER is 2.4 versus Littelfuse 1.19), maximum operating temperature (SCHURTER is -55°C to 85°C versus Littelfuse -55°C to 125°C), and AC breaking capacity (SCHURTER is 300 A versus Littelfuse 50 A). PCB layout verification is required due to dimensional variance.

Q: Is the SCHURTER 7010.6400.13 suitable for high-temperature applications?

A: The SCHURTER part is rated to 85°C maximum operating temperature, compared to 125°C for the Littelfuse parts. Applications requiring sustained operation above 85°C must use the Littelfuse 0253003.NRT1 or 0253003.NRT1L.

Q: Are all three parts RoHS3 compliant?

A: Yes. The 0253003.NRT1L, 0253003.NRT1, and 7010.6400.13 are all ROHS3 compliant.

Q: What regulatory approvals apply to these substitute parts?

A: The Littelfuse parts (0253003.NRT1L and 0253003.NRT1) carry approvals from CCC, CSA, PSE, QPL, TUV, and UR. The SCHURTER part (7010.6400.13) does not list specific approval agencies in the provided specifications.

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