Littelfuse 03453LF4H Fuse Holder - Equivalent & Substitute Parts

Part Overview

The Littelfuse 03453LF4H is a cartridge fuse holder designed for panel mount applications with a 20 A current rating at 250V. This single-circuit holder accommodates 0.25" diameter x 1.26" length cartridge fuses and features quick connect termination with 0.187" (4.7mm) terminals. The product is active in production and maintains full RoHS3 compliance and REACH unaffected status, making it suitable for industrial and commercial electrical distribution applications where reliable fuse protection is required.

Alternative models become necessary when design specifications require different fuse sizes, termination methods, or when supply chain considerations necessitate qualified substitutes from different manufacturers.

Substiute Parts

03453LF4H

Littelfuse Inc.In Stock: 123203453LF4H Datasheet

Current PartRFQ

0031.1765

SCHURTER Inc.In Stock: 13780031.1765 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 03453LF4H is determined by the following critical parameters:

• Voltage rating of 250V
• Single-circuit configuration
• Cartridge fuse holder type
• Panel mount orientation
• Copper alloy contacts with tin finish
• RoHS3 compliance and REACH unaffected status

The SCHURTER 0031.1765 qualifies as a substitute based on matching voltage rating, circuit count, fuse holder type, mounting method, contact material and finish, and regulatory compliance. However, this substitute accommodates a different fuse size (5mm x 20mm versus 6.35mm x 32mm) and uses solder lug termination instead of quick connect terminals. These differences require design-level evaluation to confirm compatibility with the intended application and fuse specifications.

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 03453LF4H and SCHURTER 0031.1765 maintain active product status with full RoHS3 compliance and REACH unaffected certification, qualifying them for applications requiring regulatory adherence in industrial and commercial environments.

Selection between these holders depends on fuse size requirements and termination method compatibility. The 03453LF4H accommodates larger 6.35mm x 32mm cartridge fuses with quick connect terminals suitable for panel-mounted applications with push-on connectors. The SCHURTER 0031.1765 accommodates smaller 5mm x 20mm fuses with solder lug termination, requiring direct PCB or wire soldering.

Both holders share identical voltage rating, circuit count, contact material composition, and regulatory compliance status. The choice between them is determined by the specific fuse size and termination requirements of the target application.

Frequently Asked Questions (FAQ)

Q: Can the SCHURTER 0031.1765 directly replace the Littelfuse 03453LF4H?

A: Direct replacement is not possible due to differences in fuse size and termination method. The 03453LF4H uses 6.35mm x 32mm fuses with quick connect terminals, while the SCHURTER uses 5mm x 20mm fuses with solder lug termination. Application redesign is required to accommodate either holder.

Q: Are both fuse holders rated for the same voltage?

A: Yes. Both the Littelfuse 03453LF4H and SCHURTER 0031.1765 are rated for 250V operation and are suitable for equivalent voltage-class applications.

Q: What is the difference between quick connect and solder lug termination?

A: Quick connect terminals (0.187" on the 03453LF4H) accept push-on connectors for tool-free assembly. Solder lug terminals on the SCHURTER require permanent soldering to PCB pads or wire connections.

Q: Do both holders comply with current environmental regulations?

A: Yes. Both the Littelfuse 03453LF4H and SCHURTER 0031.1765 are RoHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance restrictions.

Q: What fuse types are compatible with each holder?

A: The Littelfuse 03453LF4H accommodates 3AG cartridge fuses measuring 0.25" diameter x 1.26" length. The SCHURTER 0031.1765 accommodates 5mm x 20mm cartridge fuses. Fuse selection must match the holder's mechanical and electrical specifications.