Littelfuse 03540901ZXGY Fuse Block Cartridge - Equivalent & Substitute Parts

Part Overview

The Littelfuse 03540901ZXGY is a single-circuit cartridge fuse block rated for 30 A at 600V, designed for chassis mount applications. This component is part of the OMNI-BLOK® 354 series and maintains active product status. Substitute parts may be required due to inventory constraints, application-specific mounting requirements, or voltage/current rating adjustments within compatible electrical parameters.

Substiute Parts

03540901ZXGY

Littelfuse Inc.In Stock: 78203540901ZXGY Datasheet

Current PartRFQ

BK2-S-4202-1X-R

Eaton - Electronics DivisionIn Stock: 3351BK2-S-4202-1X-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Littelfuse 03540901ZXGY is determined by the following electrical and mechanical compatibility criteria:

Allowed Substitution Parameters:

• Fuse size: 0.25" Dia x 1.26" L (6.35mm x 32mm) — must remain constant
• Fuse type: Cartridge — must remain constant
• Fuseholder type: Block — must remain constant
• Number of circuits: 1 — must remain constant
• Compatible fuse standard: 3AG, 1/4" x 1-1/4" (SFE-20)

Adjustable Parameters (within limits):

• Current rating: May be lower than 30 A if application permits
• Voltage rating: May be lower than 600V if application permits
• Mounting type: May differ (chassis mount to through hole or alternative)
• Termination style: May differ if mechanical fit is maintained
• Contact material and finish: May vary

The substitute part BK2-S-4202-1X-R meets the mechanical compatibility requirements but operates at reduced electrical ratings (25 A at 250V versus 30 A at 600V). This substitution is valid only for applications where the lower current and voltage ratings are acceptable.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 03540901ZXGY and Eaton BK2-S-4202-1X-R maintain active product status and comply with applicable regulatory standards (RoHS and REACH). Selection between these components must be based on circuit requirements:

Use Littelfuse 03540901ZXGY when:

• Application requires 30 A current capacity
• Circuit operates at or near 600V
• Chassis mount configuration is required
• Quick Connect termination is specified

Use Eaton BK2-S-4202-1X-R when:

• Application requires maximum 25 A current capacity
• Circuit operates at or below 250V
• Through hole mounting is acceptable
• PC pin termination is compatible with board design

The reduced electrical ratings of the Eaton substitute make it unsuitable for direct replacement in circuits designed for the full 30 A / 600V specification of the Littelfuse component.

Frequently Asked Questions (FAQ)

Q: Can the Eaton BK2-S-4202-1X-R be used as a direct replacement for the Littelfuse 03540901ZXGY?

A: No. While both components share identical fuse size (0.25" x 1.26"), fuse type (cartridge), and circuit count (1), the Eaton part is rated for 25 A at 250V compared to the Littelfuse rating of 30 A at 600V. Direct substitution is only valid if the application circuit operates within the Eaton part's electrical limits.

Q: What mechanical differences exist between these fuse blocks?

A: The Littelfuse part is designed for chassis mount with Quick Connect termination (0.250" connectors). The Eaton part is configured for through hole mounting with PC pin termination. These differences require different board layouts and mechanical integration approaches.

Q: Are both parts compliant with current regulatory standards?

A: Yes. The Littelfuse 03540901ZXGY is ROHS3 compliant. The Eaton BK2-S-4202-1X-R is RoHS compliant. Both are REACH unaffected and carry EAR99 ECCN classification.

Q: What fuse cartridges are compatible with these blocks?

A: Both fuse blocks accept 3AG cartridge fuses with 1/4" x 1-1/4" (SFE-20) dimensions. Fuse selection must match the current and voltage ratings appropriate for each block.

Q: If my application requires 30 A at 600V, are there other substitutes available?

A: Based on the provided substitute list, only the Eaton BK2-S-4202-1X-R is documented. For applications requiring the full 30 A / 600V specification, the Littelfuse 03540901ZXGY remains the specified component.