Littelfuse 0LKS012.S Equivalent & Substitute Parts

Part Overview

The Littelfuse 0LKS012.S is a 12A 600VAC fast-blow fuse link cartridge designed for electrical and industrial applications. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance and component procurement. The POWR-GARD® LKS series fuse link requires an external holder for installation and operates within a breaking capacity of 10kA at rated voltage.

Substiute Parts

0LKS012.S

Littelfuse Inc.In Stock: 12450LKS012.S Datasheet

Current PartRFQ

KLSR012.T

Littelfuse Inc.In Stock: 840KLSR012.T Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0LKS012.S is determined by the following critical electrical and mechanical parameters:

Current Rating: 12A (exact match required)

Voltage Rating (AC): 600 VAC (exact match required)

Response Time: Fast Blow (exact match required)

Mounting Configuration: Cartridge format requiring external holder (exact match required)

Approval Certifications: CE, CSA, UL compliance (maintained in substitute)

The Littelfuse KLSR012.T cartridge fuse satisfies all substitution criteria. While the KLSR012.T is classified as a Cartridge fuse (versus the Fuse Link designation of the 0LKS012.S), both components share identical electrical ratings, response characteristics, and holder requirements. The KLSR012.T operates as an active product with enhanced breaking capacity specifications and RoHS3 compliance, providing improved availability and regulatory alignment compared to the obsolete 0LKS012.S.

Parameter Comparison

Engineering Selection Recommendations

The KLSR012.T is the manufacturer-recommended substitute for the obsolete 0LKS012.S. Both components maintain identical AC voltage and current ratings, ensuring electrical compatibility within existing circuit protection designs. The KLSR012.T carries active product status with full CE, CSA, and UL certifications, supporting continued regulatory compliance and supply chain availability.

The KLSR012.T operates under RK1 class specifications with significantly enhanced breaking capacity (200kA AC versus 10kA), providing superior fault protection margins. The component achieves RoHS3 compliance, aligning with modern environmental and procurement standards. The physical diameter remains identical (0.811"), ensuring compatibility with existing holder installations, though the increased length (5.000" versus 3.748") must be verified against available holder depth specifications.

Frequently Asked Questions (FAQ)

Q: Can the KLSR012.T directly replace the 0LKS012.S in existing installations?

A: Electrical compatibility is confirmed across all critical parameters: 12A current rating, 600 VAC voltage rating, and fast-blow response time. Physical compatibility requires verification that the existing holder accommodates the increased length of 5.000" (versus 3.748" for the original component). The identical 0.811" diameter ensures radial fit compatibility.

Q: What is the difference between a Fuse Link and a Cartridge fuse?

A: Both designations refer to cartridge-format fuses requiring external holders. The functional electrical characteristics—current rating, voltage rating, and response time—are identical between the 0LKS012.S Fuse Link and KLSR012.T Cartridge. The classification difference reflects product line organization within the Littelfuse POWR-GARD® family.

Q: Why does the KLSR012.T have a higher breaking capacity?

A: The KLSR012.T operates under RK1 class specifications, which define higher interrupting ratings than the H class of the 0LKS012.S. This enhancement provides improved fault protection performance without affecting normal-operation current-carrying characteristics.

Q: Is the KLSR012.T RoHS compliant?

A: Yes, the KLSR012.T is RoHS3 compliant. The original 0LKS012.S is classified as RoHS non-compliant. This compliance improvement supports procurement requirements in regulated industries and jurisdictions.

Q: What holder compatibility should be verified?

A: The critical dimension for holder compatibility is the cartridge length. The KLSR012.T measures 5.000" in length compared to the 0LKS012.S at 3.748". Verify that the existing holder provides sufficient depth to accommodate the longer cartridge. The diameter specification of 0.811" remains unchanged.