Littelfuse 0263003.WRT1 Equivalent & Substitute Parts

Part Overview

The Littelfuse 0263003.WRT1 is a 3A 250VAC board mount axial fuse from the PICO® II 263 series, designed for through-hole PCB applications. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The fuse provides fast-blow response characteristics with a 50A breaking capacity at rated voltage, suitable for general circuit protection in AC/DC applications.

Key Parameters

Parameter	Value
Current Rating	3 A
Voltage Rating (AC)	250 V
Response Time	Fast Blow
Mounting Type	Through Hole
Package / Case	Axial
Breaking Capacity @ Rated Voltage	50 A
Melting I²t	1.77
Size / Dimension	0.155" Dia x 0.280" L (3.94mm x 7.11mm)
DC Cold Resistance	0.0274 Ohms
Operating Temperature Range	-55°C ~ 125°C
Approval Agencies	CSA, PSE, UR

Substitute Part Grouping Explanation

Substitute parts for the 0263003.WRT1 are qualified based on strict electrical and mechanical parameter matching within the PICO® II 263 series:

Substitution Criteria:

Current Rating: 3 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Response Time: Fast Blow (exact match required)
Mounting Type: Through Hole (exact match required)
Package / Case: Axial (exact match required)
Breaking Capacity: 50 A (exact match required)
Melting I²t: 1.77 (exact match required)
Physical Dimensions: 0.155" Dia x 0.280" L (exact match required)
DC Cold Resistance: 0.0274 Ohms (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)
Approval Agencies: CSA, PSE, UR (exact match required)

The two substitute parts listed below meet all electrical and mechanical parameters. The primary distinction is product status and packaging format, with both substitutes available in active production status.

Parameter Comparison

Parameter	0263003.WRT1 (Main)	0263003.HAT1L (Substitute)	0263003.WRT1L (Substitute)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Series	PICO® II 263	PICO® II 263	PICO® II 263
Current Rating (Amps)	3 A	3 A	3 A
Voltage Rating - AC	250 V	250 V	250 V
Response Time	Fast Blow	Fast Blow	Fast Blow
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	Axial	Axial	Axial
Breaking Capacity @ Rated Voltage	50 A	50 A	50 A
Melting I²t	1.77	1.77	1.77
Size / Dimension	0.155" Dia x 0.280" L (3.94mm x 7.11mm)	0.155" Dia x 0.280" L (3.94mm x 7.11mm)	0.155" Dia x 0.280" L (3.94mm x 7.11mm)
DC Cold Resistance	0.0274 Ohms	0.0274 Ohms	0.0274 Ohms
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Approval Agencies	CSA, PSE, UR	CSA, PSE, UR	CSA, PSE, UR
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Standard	Cut Tape (CT)	Cut Tape (CT)

Engineering Selection Recommendations

Both substitute parts (0263003.HAT1L and 0263003.WRT1L) are direct functional equivalents to the obsolete 0263003.WRT1, with identical electrical and mechanical specifications. Selection between substitutes should be based on the following factors:

Product Status: Both substitutes are in active production, ensuring long-term availability and supply chain continuity compared to the obsolete main part.

Compliance: Both substitutes are ROHS3 compliant and REACH unaffected, providing improved environmental compliance over the non-compliant main part. Both maintain CSA, PSE, and UR certifications required for the application.

Inventory Availability: 0263003.WRT1L offers higher stock levels (11,176 pcs) compared to 0263003.HAT1L (1,760 pcs), which may influence procurement decisions for high-volume applications.

Packaging: Both substitutes are supplied in Cut Tape (CT) format. Confirm packaging compatibility with your assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can 0263003.HAT1L or 0263003.WRT1L be used as direct replacements for 0263003.WRT1?

A: Yes. Both parts are parametric equivalents with identical electrical ratings (3A, 250VAC), response characteristics (fast blow), mechanical dimensions (0.155" Dia x 0.280" L), and approval certifications (CSA, PSE, UR). They are functionally interchangeable in through-hole PCB applications.

Q: What is the difference between the two substitute parts?

A: 0263003.HAT1L and 0263003.WRT1L are electrically and mechanically identical. The primary differences are inventory levels and packaging batch designations. Both are active production parts with ROHS3 compliance and REACH unaffected status.

Q: Why is the main part (0263003.WRT1) marked as obsolete?

A: The main part has reached end-of-life status. The substitute parts represent the current production equivalents within the PICO® II 263 series and should be used for new designs and ongoing procurement.

Q: Are there any compatibility concerns with the Cut Tape (CT) packaging of the substitutes?

A: Cut Tape packaging is standard for automated assembly processes. Confirm that your assembly equipment supports CT format. If reel packaging is required, contact your supplier for alternative packaging options.

Q: Do the substitutes maintain the same operating temperature range?

A: Yes. Both substitutes operate across the full -55°C to 125°C temperature range, matching the main part specification.

Q: Are there any RoHS compliance differences I should consider?

A: The main part is RoHS non-compliant, while both substitutes are ROHS3 compliant. If your application requires RoHS compliance, the substitutes provide improved environmental standards.

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