LKS-300 Equivalent & Substitute Parts

Part Overview

The LKS-300 is a Super Lag Renewable Link fuse manufactured by Eaton - Bussmann Electrical Division. This product is classified as obsolete, making identification of suitable substitute components essential for system maintenance and replacement applications. The LKS-300 operates as a fuse element designed for electrical circuit protection. Due to its obsolete status, equivalent active alternatives must be evaluated based on electrical ratings, mechanical compatibility, and functional performance characteristics.

Substiute Parts

LKS-300

Eaton - Bussmann Electrical DivisionIn Stock: 1096LKS-300 Datasheet

Current PartRFQ

LPS-RK-300SP

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete LKS-300 is based on electrical performance parameters and mechanical form factor compatibility. The primary substitute identified is the LPS-RK-300SP, an active product from the same manufacturer. This substitution is valid when the following criteria are met:

• Current Rating: 300A
• Voltage Rating - AC: 600 VAC
• Voltage Rating - DC: 300 VDC
• Response Time Classification: Slow Blow
• Fuse Class: RK1
• Mounting Configuration: Bolt Mount
• RoHS Compliance: Maintained
• Regulatory Approvals: CE, CSA, UL

The LPS-RK-300SP represents the manufacturer-recommended equivalent, ensuring functional and electrical compatibility with applications originally designed for the LKS-300.

Parameter Comparison

Engineering Selection Recommendations

The LPS-RK-300SP is the manufacturer-recommended substitute for the obsolete LKS-300. Selection of this component is supported by:

• Identical current and voltage ratings (300A, 600 VAC / 300 VDC)
• Matching response time classification (Slow Blow)
• Maintained RoHS compliance and regulatory classification (EAR99)
• Active product status with current manufacturing and availability
• Manufacturer origin from Eaton - Bussmann Electrical Division, ensuring design continuity
• Regulatory approvals (CE, CSA, UL) confirming suitability for protected applications

For applications requiring the LKS-300, the LPS-RK-300SP provides direct functional replacement with the added benefit of active product support and current inventory availability.

Frequently Asked Questions (FAQ)

Q: Can the LPS-RK-300SP directly replace the LKS-300 in existing installations?

A: Yes. Both components share identical electrical ratings (300A, 600 VAC / 300 VDC) and slow blow response characteristics. The LPS-RK-300SP is the manufacturer-recommended equivalent.

Q: What is the significance of the RK1 fuse class designation for the LPS-RK-300SP?

A: RK1 classification indicates the fuse meets specific current-limiting and time-delay characteristics defined by UL standards. This classification ensures predictable performance in motor protection and transformer protection applications.

Q: Are there mechanical compatibility considerations when substituting the LPS-RK-300SP for the LKS-300?

A: The LPS-RK-300SP uses bolt mount configuration with cylindrical form factor (2.360" Dia x 11.630" L). Verify that the mounting hardware and enclosure accommodate this form factor before installation.

Q: Does the LPS-RK-300SP maintain the same regulatory compliance as the LKS-300?

A: Yes. Both components are RoHS compliant and classified under ECCN EAR99 and HTSUS 8536.10.0040. The LPS-RK-300SP additionally carries CE, CSA, and UL approvals.

Q: What is the breaking capacity of the LPS-RK-300SP?

A: The LPS-RK-300SP has a breaking capacity of 300kA AC and 100kA DC at rated voltage, indicating its ability to safely interrupt fault currents within these limits.