Littelfuse 0264.600WRT1 Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0264.600WRT1 is a 500 mA, 250 V AC/DC board mount fuse with fast blow response characteristics, designed for through-hole axial mounting. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing production and maintenance applications. The PICO® II 263 series fuse provides protection in low-current circuit applications with CSA and UR approvals.

Substiute Parts

0263.500WRT1

Littelfuse Inc.In Stock: 10510263.500WRT1 Datasheet

Current PartRFQ

0263.500HAT1L

Littelfuse Inc.In Stock: 12090263.500HAT1L Datasheet

Parametric EquivalentRFQ

0263.500WRT1L

Littelfuse Inc.In Stock: 162230263.500WRT1L Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0264.600WRT1 are determined by strict equivalence across the following critical parameters:

• Current Rating: 500 mA
• Voltage Rating (AC): 250 V
• Response Time: Fast Blow
• Mounting Type: Through Hole
• Package / Case: Axial
• Breaking Capacity @ Rated Voltage: 50 A
• Melting I²t: 0.084
• Operating Temperature Range: -55°C to 125°C
• DC Cold Resistance: 0.332 Ohms
• Physical Dimensions: 0.155" Dia x 0.280" L (3.94mm x 7.11mm)
• Approval Agencies: CSA, UR

Both substitute parts (0264.600HAT1L and 0264.600WRT1L) maintain identical electrical and mechanical specifications to the main part. The primary differences are product status (active vs. obsolete) and packaging format (Cut Tape vs. bulk).

Parameter Comparison

Engineering Selection Recommendations

Both 0264.600HAT1L and 0264.600WRT1L are direct functional equivalents to the obsolete 0264.600WRT1. Selection between the two active substitutes should be based on the following factors:

0264.600WRT1L is the preferred selection for new designs and production applications due to significantly higher inventory availability (16,200 units) and established supply chain presence. This part maintains identical electrical and mechanical specifications while offering ROHS3 compliance.

0264.600HAT1L provides an alternative with lower inventory levels (1,101 units) but identical performance characteristics and ROHS3 compliance. This part is suitable for applications where Cut Tape packaging is preferred or where supply from the primary option is constrained.

Both substitute parts carry CSA and UR approvals, matching the regulatory requirements of the original component. The transition from RoHS non-compliant to ROHS3 compliant status reflects current manufacturing standards and regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can 0264.600HAT1L and 0264.600WRT1L be used interchangeably with 0264.600WRT1?

A: Yes. Both substitute parts maintain identical electrical ratings (500 mA, 250 V AC/DC), response characteristics (fast blow), mechanical dimensions (0.155" Dia x 0.280" L), and thermal operating range (-55°C to 125°C). All three parts are PICO® II 263 series components with CSA and UR approvals.

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

A: The primary differences are inventory availability and packaging format. 0264.600WRT1L has significantly higher stock (16,200 units) compared to 0264.600HAT1L (1,101 units). Both are supplied in Cut Tape (CT) packaging and carry ROHS3 compliance.

Q: Why is the original part marked as obsolete?

A: The 0264.600WRT1 is classified as obsolete due to its RoHS non-compliant status. The active substitutes (0264.600HAT1L and 0264.600WRT1L) represent the current production equivalents with updated environmental compliance.

Q: Are there any differences in breaking capacity or thermal characteristics?

A: No. Both substitute parts maintain the same breaking capacity (50 A @ rated voltage), melting I²t value (0.084), DC cold resistance (0.332 Ohms), and operating temperature range (-55°C to 125°C) as the original component.

Q: Which substitute should be selected for new PCB designs?

A: 0264.600WRT1L is recommended for new designs due to superior inventory availability and established supply continuity. Both parts are functionally equivalent and carry identical regulatory approvals.