Littelfuse 04450004Z Cartridge Fuse Holder - Equivalent & Substitute Parts

Part Overview

The Littelfuse 04450004Z is a cartridge fuse holder rated for 20 A, designed for free hanging (in-line) mounting with 0.25" diameter x 1.26" length cartridge fuses. This component is used in electrical circuits requiring inline fuse protection with wire lead termination. The part is currently active in production with 938 units in stock. Substitute parts may be required due to inventory constraints, application-specific voltage requirements, or current rating adjustments in circuit design modifications.

Substiute Parts

04450004Z

Littelfuse Inc.In Stock: 100504450004Z Datasheet

Current PartRFQ

01500322H

Littelfuse Inc.In Stock: 795201500322H Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 04450004Z is determined by the following critical parameters:

• Fuse size compatibility: 0.25" Dia x 1.26" L (6.35mm x 32mm) - must match exactly
• Mounting configuration: Free hanging (in-line) orientation
• Termination style: Wire leads
• Number of circuits: Single circuit (1)
• Fuse type: Cartridge format
• Regulatory compliance: ROHS3 and REACH status

The substitute part 01500322H meets these core mechanical and electrical compatibility criteria. The primary difference is the current rating (15 A versus 20 A) and the addition of a specified voltage rating (500V), which represents a more constrained application profile suitable for lower-current circuits.

Parameter Comparison

Engineering Selection Recommendations

Both the 04450004Z and 01500322H are active products manufactured by Littelfuse Inc. and comply with ROHS3 and REACH requirements. Selection between these parts depends on circuit current requirements:

• Use 04450004Z for circuits requiring 20 A protection
• Use 01500322H for circuits requiring 15 A protection at 500V

Both parts share identical mechanical form factors (0.25" x 1.26" cartridge size) and mounting configurations, ensuring physical interchangeability in the fuse holder assembly. The 01500322H provides higher inventory availability (7872 units versus 938 units) and includes an explicit voltage rating specification of 500V.

Frequently Asked Questions (FAQ)

Q: Can the 01500322H substitute for the 04450004Z in all applications?

A: Physical and mechanical compatibility is confirmed. However, the 01500322H has a lower current rating (15 A versus 20 A). Substitution is only appropriate if the circuit current requirement is 15 A or less.

Q: What is the significance of the 500V rating on the 01500322H?

A: The 500V rating on the 01500322H specifies the maximum voltage the fuse holder can safely interrupt. The 04450004Z does not have a specified voltage rating in the provided data. Ensure the substitute part's voltage rating meets or exceeds your circuit voltage requirements.

Q: Are the cartridge fuse sizes identical between these two parts?

A: Yes. Both parts accept 0.25" diameter x 1.26" length (6.35mm x 32mm) cartridge fuses, confirming mechanical compatibility.

Q: Do both parts use the same termination method?

A: Yes. Both the 04450004Z and 01500322H use wire lead termination, ensuring identical connection methods in circuit assembly.

Q: What is the difference in inventory availability?

A: The 01500322H has significantly higher stock (7872 units) compared to the 04450004Z (938 units), which may influence procurement decisions for high-volume applications.