LKS-125 Equivalent & Substitute Parts

Part Overview

The LKS-125 is a Super Lag Renewable Link fuse rated at 125A/600V, manufactured by Eaton - Bussmann Electrical Division. This component is classified as obsolete, making identification of suitable substitutes essential for system maintenance and component replacement. The part is RoHS compliant and carries an MSL rating of 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling.

Substiute Parts

LKS-125

Eaton - Bussmann Electrical DivisionIn Stock: 1186LKS-125 Datasheet

Current PartRFQ

LPS-RK-125SP

Eaton - Bussmann Electrical DivisionIn Stock: 944LPS-RK-125SP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The LPS-RK-125SP is identified as the manufacturer-recommended substitute for the LKS-125. Substitution eligibility is determined by the following critical parameters:

• Current Rating: 125A (matching specification)
• Voltage Rating - AC: 600 VAC (matching specification)
• Voltage Rating - DC: 300 VDC (exceeds DC requirement)
• Fuse Type: Cartridge (functional equivalent to renewable link design)
• Class: RK1 (standard industrial fuse classification)
• RoHS Compliance: RoHS Compliant (matching compliance requirement)
• Manufacturer: Eaton - Bussmann Electrical Division (same manufacturer)
• HTSUS Code: 8536.10.0040 (matching tariff classification)

The LPS-RK-125SP maintains electrical equivalence through identical AC voltage and current ratings while providing enhanced DC voltage capability. Both components share the same HTSUS classification and RoHS compliance status.

Parameter Comparison

Engineering Selection Recommendations

The LPS-RK-125SP is the direct manufacturer-recommended substitute for the obsolete LKS-125. Selection of this substitute is supported by:

• Identical current and AC voltage ratings ensure electrical compatibility in existing circuits
• Active product status guarantees ongoing availability and supply chain continuity
• RoHS compliance certification matches the original component specification
• Same manufacturer origin ensures design consistency and quality standards
• Enhanced DC voltage rating (300 VDC) provides additional operational flexibility without compromising AC performance

The transition from the LKS-125 to LPS-RK-125SP is appropriate for all applications where the original component was specified.

Frequently Asked Questions (FAQ)

Q: Can the LPS-RK-125SP be used as a direct replacement for the LKS-125?

A: Yes. Both components share identical current (125A) and AC voltage (600 VAC) ratings. The LPS-RK-125SP is the manufacturer-recommended substitute and carries active product status, ensuring availability and support.

Q: What is the difference between the renewable link design of the LKS-125 and the cartridge design of the LPS-RK-125SP?

A: The LKS-125 uses a renewable link mechanism, while the LPS-RK-125SP is a cartridge-type fuse. Both are functional fuse designs rated for the same electrical parameters. The cartridge design of the LPS-RK-125SP is the current industry standard for this amperage and voltage class.

Q: Does the LPS-RK-125SP provide any additional capability compared to the LKS-125?

A: The LPS-RK-125SP includes a 300 VDC rating, whereas the LKS-125 does not specify a DC rating. This provides expanded application flexibility for circuits requiring DC operation at or below 300V.

Q: Are there any compliance or certification differences between these components?

A: Both components are RoHS compliant and share the same HTSUS tariff classification (8536.10.0040). The LPS-RK-125SP carries CE, CSA, and UL approvals, confirming compliance with major industrial standards.

Q: What mounting considerations apply to the LPS-RK-125SP?

A: The LPS-RK-125SP uses bolt mount configuration with cylindrical blade terminals. Verify that existing mounting hardware and terminal connections are compatible with this cartridge design before installation.