LR600303PR Equivalent & Substitute Parts

Part Overview

The LR600303PR is a Class R fuse holder cartridge designed for chassis mount applications with a 600V rating and 30A current capacity across 3 circuits. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance and component sourcing. The part employs screw terminal and pressure plate termination for secure electrical connections in industrial power distribution applications.

Substiute Parts

LR600303PR

Littelfuse Inc.In Stock: 695LR600303PR Datasheet

Current PartRFQ

LFR600303PID

Littelfuse Inc.In Stock: 745LFR600303PID Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LR600303PR is determined by the following critical parameters:

• Electrical Compatibility: Voltage rating (600V), current rating (30A), and circuit count (3) must match exactly
• Fuse Type: Cartridge fuse type must be maintained
• Termination: Screw terminal and pressure plate termination must be present
• Functional Classification: Fuseholder or fuse block designation for Class R fuses

The substitute part LFR600303PID maintains electrical equivalence across all critical parameters while differing in mounting configuration (DIN Rail vs. Chassis Mount) and physical fuse dimensions. This substitution is valid where the mounting form factor change is accommodated by the installation environment.

Parameter Comparison

Engineering Selection Recommendations

The LFR600303PID serves as the active equivalent to the obsolete LR600303PR, providing identical electrical performance across all rated parameters. Selection between these parts depends on installation constraints:

LFR600303PID is appropriate when:

• DIN Rail mounting is available or can be accommodated in the installation
• RoHS3 compliance is required for new designs or regulatory adherence
• Smaller fuse cartridge dimensions (0.563" Dia x 2" L) are compatible with available space
• Active product support and continued availability are required

LR600303PR remains applicable only when:

• Existing chassis mount form factor is mandatory and cannot be modified
• Legacy system compatibility requires the original mounting configuration
• RoHS non-compliance is acceptable for the application

Frequently Asked Questions (FAQ)

Q: Can LFR600303PID directly replace LR600303PR in all applications?

A: Electrical substitution is valid. The LFR600303PID maintains 30A, 600V, 3-circuit specifications and Class R fuse compatibility. However, the mounting type differs (DIN Rail vs. Chassis Mount), requiring mechanical accommodation in the installation.

Q: What is the impact of different fuse cartridge sizes?

A: The LFR600303PID uses smaller cartridges (0.563" Dia x 2" L vs. 0.813" Dia x 5" L). This affects physical space requirements and fuse availability. Verify that Class R fuses in the smaller size are available for your application.

Q: Does RoHS compliance affect electrical performance?

A: No. RoHS3 compliance in the LFR600303PID reflects manufacturing process changes only. Electrical ratings, current capacity, and voltage performance remain identical to the LR600303PR.

Q: Are both parts compatible with the same Class R fuses?

A: Both parts are designed for Class R fuses. However, the different cartridge sizes mean different Class R fuse models must be used. Verify fuse part numbers for each form factor.

Q: What should be considered when transitioning from LR600303PR to LFR600303PID?

A: Evaluate mounting infrastructure (DIN Rail availability), fuse cartridge size compatibility, and termination point accessibility. Confirm Class R fuse availability in the smaller cartridge size required by the LFR600303PID.