Littelfuse 02540122Z Fuse Block Cartridge Equivalent & Substitute Parts

Part Overview

The Littelfuse 02540122Z is a cartridge fuse block designed for PCB mounting applications with a 10 A current rating and 400V voltage specification. This component features a 2-circuit configuration in the OMNI-BLOK® 254 series with through-hole termination and horizontal orientation. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations where equivalent functionality is required.

Substiute Parts

02540122Z

Littelfuse Inc.In Stock: 91502540122Z Datasheet

Current PartRFQ

02540101Z

LittelfuseIn Stock: 740402540101Z Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 02540122Z is determined by strict alignment of the following critical parameters:

• Current Rating: 10 A (exact match required)
• Voltage Rating: 400V (exact match required)
• Fuse Size: 0.177" Dia x 0.57" L / 4.5mm x 14.48mm (exact match required)
• Fuse Type: Cartridge (exact match required)
• Mounting Type: Through Hole (exact match required)
• Termination Style: PC Pin (exact match required)
• Series Compatibility: OMNI-BLOK® 254 (same series)
• Contact Material & Finish: Spring Brass with Tin finish (exact match required)

The substitute part 02540101Z meets all critical electrical and mechanical parameters. The primary difference is the circuit configuration: the 02540101Z provides a 1-circuit design versus the 2-circuit configuration of the main part. This distinction affects board layout and application requirements but does not alter the fundamental electrical performance characteristics for individual circuit protection.

Parameter Comparison

Engineering Selection Recommendations

The 02540101Z is the manufacturer-recommended substitute for the obsolete 02540122Z. Both components maintain identical electrical specifications (10 A at 400V) and mechanical dimensions (4.5mm x 14.48mm cartridge format). Both are ROHS3 compliant and utilize equivalent contact materials and finishes.

The primary design consideration is circuit count: the 02540122Z accommodates 2 circuits while the 02540101Z provides 1 circuit. Selection between these parts depends on the specific application requirement for simultaneous multi-circuit protection. For applications requiring dual-circuit protection, multiple 02540101Z units may be required. For single-circuit applications, the 02540101Z provides direct functional equivalence.

The 02540101Z maintains active product status with significantly higher inventory availability (7388 pcs vs. 867 pcs), supporting long-term supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the 02540101Z directly replace the 02540122Z in all applications?

A: The 02540101Z provides electrical and mechanical equivalence for individual circuit protection. Applications requiring simultaneous 2-circuit protection in a single component must evaluate whether multiple 02540101Z units or alternative multi-circuit designs are appropriate.

Q: Are the physical dimensions identical between these parts?

A: Yes. Both components use the same 0.177" diameter x 0.57" length (4.5mm x 14.48mm) cartridge format with identical through-hole PC pin termination, ensuring mechanical compatibility with existing PCB layouts designed for the 02540122Z.

Q: What is the significance of the product status difference?

A: The 02540122Z is classified as obsolete, indicating discontinued manufacturing. The 02540101Z maintains active status with full manufacturing support and significantly higher inventory levels, ensuring availability for current and future procurement.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the 02540122Z and 02540101Z are ROHS3 compliant and share identical electrical ratings, contact materials, and finishes.

Q: What packaging options are available?

A: The 02540122Z is available in standard packaging. The 02540101Z is supplied in bulk packaging, which may affect procurement quantities and logistics considerations.