Littelfuse 0662001.ZRLL Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0662001.ZRLL is a 1 A, 250 V AC/DC board mount fuse with fast blow response time, designed for through-hole radial mounting in vertical orientation. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The fuse is housed in a radial can package measuring 0.335" diameter × 0.333" height (8.50mm × 8.45mm) and is approved by CSA, SEMKO, UL, and VDE standards.

Substiute Parts

0662001.ZRLL

LittelfuseIn Stock: 7010662001.ZRLL Datasheet

Current PartRFQ

37011000000

Littelfuse Inc.In Stock: 2023837011000000 Datasheet

DirectRFQ

0034.6014

SCHURTER Inc.In Stock: 31920034.6014 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 0662001.ZRLL is determined by strict equivalence across the following electrical and mechanical parameters:

• Current Rating: 1 A (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)
• Fuse Type: Board Mount (Cartridge Style Excluded) (exact match required)

The identified substitute parts meet all these core criteria. Variations in breaking capacity, melting I²t, physical dimensions within tolerance, and operating temperature ranges do not disqualify substitution when all primary electrical and mechanical parameters align.

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are classified as active products, providing long-term availability and supply chain stability compared to the obsolete 0662001.ZRLL.

The Littelfuse 37011000000 (TR5® 370 series) offers higher breaking capacity (50 A versus 35 A) and lower melting I²t (0.2 versus 0.33), with certifications including CCC, cURus, PSE, SEMKO, and VDE. Operating temperature range is specified as -40°C to 85°C. Packaging is provided in cut tape format.

The SCHURTER 0034.6014 (MSF 250 series) maintains identical breaking capacity (35 A) and melting I²t (0.33) to the original part, with certifications including CCC, cURus, and VDE. Operating temperature range is specified as -40°C to 85°C. Packaging is provided in bulk format.

Both substitutes are ROHS3 compliant and maintain the same electrical ratings and mechanical form factor as the original part. Selection between substitutes should be based on packaging requirements, certification scope alignment with end-application standards, and inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 37011000000 be used as a direct replacement for the 0662001.ZRLL?

A: Yes. Both parts share identical current rating (1 A), voltage rating (250 V AC), response time (fast blow), mounting type (through hole), and package configuration (radial, can, vertical). The 37011000000 features higher breaking capacity and lower melting I²t, which do not prevent substitution when all primary electrical and mechanical parameters match.

Q: Can the SCHURTER 0034.6014 be used as a direct replacement for the 0662001.ZRLL?

A: Yes. Both parts share identical current rating (1 A), voltage rating (250 V AC), response time (fast blow), mounting type (through hole), and package configuration (radial, can, vertical). The 0034.6014 maintains the same breaking capacity and melting I²t as the original part.

Q: What is the difference in physical dimensions between the substitutes?

A: The 0662001.ZRLL measures 0.335" diameter × 0.333" height. The Littelfuse 37011000000 measures 0.335" diameter × 0.315" height (0.018" shorter). The SCHURTER 0034.6014 measures 0.335" diameter × 0.335" height (0.002" taller). All three maintain the same 0.335" diameter and fit standard through-hole radial mounting footprints.

Q: Are there packaging format differences between the substitutes?

A: Yes. The Littelfuse 37011000000 is supplied in cut tape (CT) format. The SCHURTER 0034.6014 is supplied in bulk format. The original 0662001.ZRLL packaging format is not specified in available data.

Q: Which certifications apply to each part?

A: The 0662001.ZRLL carries CSA, SEMKO, UL, and VDE approvals. The Littelfuse 37011000000 carries CCC, cURus, PSE, SEMKO, and VDE approvals. The SCHURTER 0034.6014 carries CCC, cURus, and VDE approvals. Verify that the selected substitute meets all required certifications for your specific application and regulatory jurisdiction.

Q: What is the significance of the melting I²t difference in the Littelfuse 37011000000?

A: The Littelfuse 37011000000 has a lower melting I²t value (0.2 versus 0.33), indicating faster thermal response. This does not prevent substitution when all primary electrical parameters match, but it may affect circuit protection characteristics in applications with specific thermal response requirements.