Equivalent & Substitute Parts for Littelfuse 0662.250ZRLL Board Mount Fuse

Part Overview

The Littelfuse 0662.250ZRLL is a 250 mA, 250 V AC/DC board mount fuse with radial, can-style vertical packaging. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The fuse operates with fast-blow response characteristics and is designed for through-hole mounting applications requiring reliable overcurrent protection in industrial and commercial equipment.

Key Parameters

Parameter	Value
Current Rating	250 mA
Voltage Rating (AC)	250 V
Response Time	Fast Blow
Mounting Type	Through Hole
Fuse Type	Board Mount (Cartridge Style Excluded)
Package / Case	Radial, Can, Vertical
Breaking Capacity @ Rated Voltage	35A minimum

Substitute Part Grouping Explanation

Substitute parts for the 0662.250ZRLL are qualified based on the following electrical and mechanical parameters:

Current Rating: 250 mA (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: Radial, Can, Vertical (exact match required)
Breaking Capacity: Minimum 35A at rated voltage
Melting I²t: Within acceptable range for fast-blow fuse characteristics

Two qualified substitutes meet these criteria: the Littelfuse 37002500000 (TR5® 370 series) and the SCHURTER 0034.6008 (MSF 250 series). Both maintain identical electrical specifications while offering improved product status and availability compared to the obsolete 0662.250ZRLL.

Parameter Comparison

Parameter	0662.250ZRLL (Main Part)	37002500000 (Littelfuse)	0034.6008 (SCHURTER)
Manufacturer	Littelfuse Inc.	Littelfuse	SCHURTER Inc.
Series	LT-5™ 662	TR5® 370	MSF 250
Product Status	Obsolete	Active	Active
Current Rating (Amps)	250 mA	250 mA	250 mA
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
Fuse Type	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)	Board Mount (Cartridge Style Excluded)
Package / Case	Radial, Can, Vertical	Radial, Can, Vertical	Radial, Can, Vertical
Breaking Capacity @ Rated Voltage	35A	50A	35A
Melting I²t	0.058	0.051	0.058
Size / Dimension	0.335" Dia x 0.333" H (8.50mm x 8.45mm)	0.335" Dia x 0.315" H (8.50mm x 8.00mm)	0.335" Dia x 0.335" H (8.50mm x 8.50mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Operating Temperature	Not specified	-40°C ~ 85°C	-40°C ~ 85°C
Approval Agency	CSA, SEMKO, UL, VDE	CCC, cURus, SEMKO, VDE	CCC, cURus, VDE
Packaging	Not specified	Cut Tape (CT)	Bulk

Engineering Selection Recommendations

Both substitute parts are active products with full regulatory compliance and superior availability compared to the obsolete 0662.250ZRLL.

The Littelfuse 37002500000 (TR5® 370 series) offers the highest breaking capacity at 50A and is supplied in Cut Tape packaging, suitable for automated assembly processes. This part maintains SEMKO certification consistent with the original part and includes specified operating temperature range (-40°C ~ 85°C).

The SCHURTER 0034.6008 (MSF 250 series) matches the original breaking capacity specification of 35A and melting I²t value of 0.058, providing the closest electrical performance profile to the 0662.250ZRLL. This part is supplied in bulk packaging and includes specified operating temperature range (-40°C ~ 85°C).

Both substitutes are ROHS3 compliant and maintain the identical current rating, voltage rating, response time, mounting type, and package configuration required for direct replacement in through-hole applications.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 37002500000 be used as a direct replacement for the 0662.250ZRLL?

A: Yes. The 37002500000 maintains identical electrical specifications: 250 mA current rating, 250 V AC voltage rating, and fast-blow response time. The radial, can-style vertical package and through-hole mounting are identical. The higher breaking capacity (50A vs. 35A) provides enhanced protection margin. Physical dimensions differ slightly (8.00mm height vs. 8.45mm), but this remains within acceptable tolerance for standard through-hole PCB layouts.

Q: Can the SCHURTER 0034.6008 be used as a direct replacement for the 0662.250ZRLL?

A: Yes. The 0034.6008 maintains identical electrical specifications and physical package configuration. The breaking capacity and melting I²t values match the original part exactly. Physical dimensions are nearly identical (8.50mm height vs. 8.45mm), with negligible difference for PCB mounting applications.

Q: What is the difference in melting I²t between the substitutes?

A: The Littelfuse 37002500000 has a melting I²t of 0.051, while both the original 0662.250ZRLL and SCHURTER 0034.6008 have a melting I²t of 0.058. This indicates slightly faster thermal response in the Littelfuse substitute, appropriate for fast-blow fuse operation.

Q: Are there packaging differences between the substitutes?

A: Yes. The Littelfuse 37002500000 is supplied in Cut Tape (CT) packaging, optimized for automated pick-and-place assembly. The SCHURTER 0034.6008 is supplied in bulk packaging. Selection depends on manufacturing process requirements and volume considerations.

Q: Do both substitutes have operating temperature specifications?

A: Yes. Both active substitutes specify operating temperature range of -40°C ~ 85°C. The original obsolete part does not include this specification. This defined range supports thermal design verification for applications with temperature-dependent performance requirements.

Q: Are regulatory certifications maintained with these substitutes?

A: Both substitutes maintain ROHS3 compliance and VDE certification. The Littelfuse 37002500000 retains SEMKO certification consistent with the original part. Certification differences are minor and do not affect functional equivalence for standard industrial applications.

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