LR251001C Equivalent & Substitute Parts

Part Overview

The LR251001C is a Class R fuse holder rated for 100 A at 250V, designed for single-circuit cartridge fuses with chassis mount configuration. This component is classified as obsolete, making identification of compatible alternatives essential for system maintenance and component replacement in existing installations.

The primary reason for seeking substitute parts is the obsolete status of the LR251001C. Active production alternatives with equivalent electrical and mechanical specifications enable continued support for equipment utilizing this fuse holder design.

Substiute Parts

LR251001C

Littelfuse Inc.In Stock: 910LR251001C Datasheet

Current PartRFQ

LFR251001CID

Littelfuse Inc.In Stock: 782LFR251001CID Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The LFR251001CID qualifies as a direct substitute based on the following matching parameters:

• Current Rating: 100 A (identical)
• Voltage Rating: 250V (identical)
• Fuse Type: Cartridge (identical)
• Fuse Size: 1.063" Dia x 5.874" L (27mm x 149.2mm) (identical)
• Number of Circuits: 1 (identical)
• Termination Style: Box Lug (identical)
• For Use With: Class R Fuses (identical)

The primary difference between these parts is the mounting configuration: the LR251001C uses chassis mount, while the LFR251001CID uses DIN rail mount. This distinction affects physical installation but does not alter electrical compatibility with Class R cartridge fuses.

Parameter Comparison

Engineering Selection Recommendations

The LFR251001CID is the direct electrical equivalent to the LR251001C. Both components accept identical Class R cartridge fuses and maintain the same 100 A / 250V electrical specifications.

Selection between these parts depends on installation requirements:

• LR251001C: Appropriate for chassis mount applications where the original mounting configuration is retained.
• LFR251001CID: Suitable for DIN rail installations or new designs requiring active-status components. This part carries ROHS3 compliance, whereas the LR251001C is RoHS non-compliant.

The LFR251001CID is currently in active production with 747 units in stock, compared to the obsolete LR251001C with 833 units remaining in inventory.

Frequently Asked Questions (FAQ)

Q: Can the LFR251001CID replace the LR251001C in an existing installation?

A: Electrical compatibility is confirmed. The LFR251001CID accepts the same Class R cartridge fuses and operates at identical voltage and current ratings. Physical installation requires DIN rail mounting rather than chassis mount, necessitating mechanical adaptation.

Q: What is the difference between a fuse holder and a fuse block?

A: Both terms describe cartridge fuse mounting devices. The LR251001C is designated as a holder with chassis mount configuration. The LFR251001CID is designated as a block with DIN rail configuration. Electrical function and fuse compatibility remain identical.

Q: Are the fuse sizes identical between these parts?

A: Yes. Both the LR251001C and LFR251001CID accommodate Class R cartridge fuses measuring 1.063" diameter by 5.874" length (27mm x 149.2mm). Fuse interchangeability is confirmed.

Q: What is the significance of RoHS compliance differences?

A: The LR251001C is RoHS non-compliant, while the LFR251001CID is ROHS3 compliant. For applications subject to RoHS regulations or environmental compliance requirements, the LFR251001CID is the appropriate selection.

Q: Do both parts use the same termination method?

A: Yes. Both the LR251001C and LFR251001CID employ box lug termination, ensuring consistent electrical connection methods.