Equivalent & Substitute Parts for Littelfuse 0662.500ZRLL

Part Overview

The Littelfuse 0662.500ZRLL is a 500 mA, 250 V AC/DC board mount radial fuse with fast blow response time, designed for through-hole vertical mounting in the LT-5™ 662 series. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part maintains ROHS3 compliance and carries multiple international approvals including CSA, SEMKO, UL, and VDE.

Substiute Parts

0662.500ZRLL

Littelfuse Inc.In Stock: 8860662.500ZRLL Datasheet

Current PartRFQ

37005000000

Littelfuse Inc.In Stock: 309237005000000 Datasheet

DirectRFQ

0034.6011

SCHURTER Inc.In Stock: 34630034.6011 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 0662.500ZRLL is determined by strict equivalence across the following electrical and mechanical parameters:

• Current Rating: 500 mA (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Can, Vertical (exact match required)
• Breaking Capacity @ Rated Voltage: 35 A (exact match required)

Two substitute parts meet these criteria: the Littelfuse 37005000000 (TR5® 370 series, active status) and the SCHURTER 0034.6011 (MSF 250 series, active status). Both maintain identical electrical performance specifications and mechanical compatibility with the original part's footprint and mounting requirements.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the obsolete 0662.500ZRLL, the Littelfuse 37005000000 is the primary substitute. This part maintains active product status, carries ROHS3 compliance, and holds international certifications including CCC, cURus, SEMKO, and VDE. The TR5® 370 series offers improved thermal performance with a lower melting I²t value (0.042 versus 0.09), indicating faster response characteristics while maintaining all electrical and mechanical equivalence.

The SCHURTER 0034.6011 serves as an alternative substitute, also with active product status and ROHS3 compliance. This MSF 250 series part matches the original melting I²t specification (0.09) and carries CCC, cURus, and VDE certifications. The dimensional height is marginally larger (8.50mm versus 8.45mm), remaining within typical PCB layout tolerances for radial through-hole components.

Both substitutes are suitable for direct replacement based on electrical performance, mechanical compatibility, and regulatory compliance. Selection between them depends on specific application requirements regarding thermal response characteristics and available inventory.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 37005000000 be used as a direct replacement for the 0662.500ZRLL?

A: Yes. Both parts share identical current rating (500 mA), voltage rating (250 V AC), response time (fast blow), mounting type (through hole), and breaking capacity (35 A). The 37005000000 is mechanically compatible with the original footprint and carries equivalent international certifications.

Q: What is the difference in melting I²t between the main part and the Littelfuse substitute?

A: The 37005000000 has a melting I²t of 0.042 compared to the 0662.500ZRLL's 0.09. This indicates faster thermal response in the substitute part, which may affect circuit protection timing in applications with specific I²t requirements. Verify application compatibility if precise thermal response is critical.

Q: Are there dimensional differences between the three parts?

A: Minor dimensional variations exist in the height specification. The 0662.500ZRLL measures 0.333" H (8.45mm), the 37005000000 measures 0.315" H (8.00mm), and the 0034.6011 measures 0.335" H (8.50mm). All maintain the same 0.335" diameter (8.50mm). These variations are within standard PCB layout tolerances for radial through-hole components.

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

A: The Littelfuse 37005000000 is recommended for new designs due to its active product status, improved thermal characteristics, and availability. The SCHURTER 0034.6011 remains a valid alternative if specific design constraints or supply chain considerations favor cross-manufacturer sourcing.

Q: Do all three parts carry the same regulatory certifications?

A: No. The 0662.500ZRLL carries CSA, SEMKO, UL, and VDE approvals. The 37005000000 carries CCC, cURus, SEMKO, and VDE approvals. The 0034.6011 carries CCC, cURus, and VDE approvals. Verify that the selected substitute meets all required certifications for your specific application and market region.

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

A: The Littelfuse 37005000000 is supplied in Cut Tape (CT) packaging, while the SCHURTER 0034.6011 is supplied in Bulk packaging. Packaging selection may affect procurement quantities and handling procedures but does not impact electrical or mechanical performance.