Equivalent & Substitute Parts for LPS-RK-300SP

Part Overview

The LPS-RK-300SP is a 300A fuse cartridge manufactured by Eaton - Bussmann Electrical Division, rated for 600 VAC and 300 VDC operation. This Low-Peak™ LPS series component is designed for motor protection and transformer protection applications with RK1 class certification. The part is currently active in production with 877 units in stock. Substitute parts are identified when equivalent electrical ratings, voltage specifications, and approval certifications align with the original component's functional requirements.

Substiute Parts

LPS-RK-300SP

Eaton - Bussmann Electrical DivisionIn Stock: 955LPS-RK-300SP Datasheet

Current PartRFQ

LSRK300.X

Littelfuse Inc.In Stock: 1141LSRK300.X Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LPS-RK-300SP is determined by the following critical parameters:

• Current Rating: 300A (exact match required)
• Voltage Rating - AC: 600 VAC (exact match required)
• Voltage Rating - DC: 300 VDC (exact match required)
• Fuse Type: Cartridge (exact match required)
• Response Time: Slow Blow (exact match required)
• Class: RK1 (exact match required)
• Approval Agencies: Minimum CE, CSA, UL certification required

The substitute part LSRK300.X meets all electrical and functional criteria for direct substitution. Both components share identical current, voltage, and response characteristics within the RK1 classification framework.

Parameter Comparison

Engineering Selection Recommendations

Both the LPS-RK-300SP and LSRK300.X are active production components with full regulatory compliance. Selection between these parts depends on system integration requirements:

The LPS-RK-300SP features integrated bolt mount capability with higher breaking capacity ratings (300kA AC, 100kA DC) and smaller physical dimensions (59.94mm diameter). This configuration is suitable for direct installation in existing bolt-mount fuse holders.

The LSRK300.X requires a separate holder assembly and provides lower breaking capacity (200kA AC, 20kA DC) with larger physical dimensions (72.20mm diameter). This component includes QPL certification in addition to CE, CSA, and UL approvals. Selection of this substitute requires verification that the system's fuse holder is compatible with the larger cartridge diameter and blade terminal configuration.

Both components maintain identical electrical performance within RK1 class specifications and are suitable for motor protection and transformer protection applications at 300A, 600 VAC, and 300 VDC ratings.

Frequently Asked Questions (FAQ)

Q: Can LSRK300.X be used as a direct replacement for LPS-RK-300SP?

A: Electrical substitution is valid based on matching current, voltage, and RK1 class ratings. Physical installation compatibility must be verified. The LPS-RK-300SP uses bolt mount configuration while LSRK300.X requires a holder assembly. Confirm that the system's fuse holder accommodates the LSRK300.X cartridge diameter of 72.20mm.

Q: What are the key differences between these two cartridge fuses?

A: The primary differences are mounting configuration (bolt mount versus holder-based), physical dimensions, and breaking capacity. The LPS-RK-300SP provides 300kA AC breaking capacity while LSRK300.X provides 200kA AC. Both maintain identical 300A current rating, 600 VAC / 300 VDC voltage ratings, and slow-blow response characteristics.

Q: Are both components RoHS compliant?

A: Yes. The LPS-RK-300SP is RoHS Compliant. The LSRK300.X is ROHS3 Compliant. Both meet environmental compliance requirements.

Q: What certifications apply to each component?

A: The LPS-RK-300SP holds CE, CSA, and UL certifications. The LSRK300.X holds CE, CSA, QPL, and UL certifications. Both meet the minimum certification requirements for industrial fuse cartridge applications.

Q: Does physical size difference affect substitution?

A: Yes. The LPS-RK-300SP diameter is 59.94mm while LSRK300.X diameter is 72.20mm. The fuse holder must be verified to accept the larger cartridge diameter before substitution. Length specifications are equivalent at approximately 295mm.