0LKS040.S Equivalent & Substitute Parts

Part Overview

The 0LKS040.S is a 40A 600VAC cartridge fuse link manufactured by Littelfuse Inc. as part of the POWR-GARD® LKS series. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for system maintenance and component procurement. The part operates as a fast-blow fuse element requiring a dedicated holder for installation in electrical and industrial applications.

Substiute Parts

0LKS040.S

Littelfuse Inc.In Stock: 11630LKS040.S Datasheet

Current PartRFQ

KLSR040.T

Littelfuse Inc.In Stock: 902KLSR040.T Datasheet

MFR RecommendedRFQ

LKS-40

Eaton - Bussmann Electrical DivisionIn Stock: 1193LKS-40 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0LKS040.S is determined by the following critical parameters:

• Current Rating: 40A (exact match required)
• Voltage Rating (AC): 600 VAC (exact match required)
• Fuse Type: Cartridge configuration with fast-blow response
• Mounting: Cartridge format requiring holder installation
• Regulatory Compliance: CE, CSA, UL certifications

Two substitute parts meet these core electrical and mechanical criteria:

1. KLSR040.T (Littelfuse Inc., POWR-GARD® KLSR series) – Active status, RK1 class cartridge fuse with extended voltage rating (300 VDC capability) and higher breaking capacity (200kA AC, 20kA DC)

2. LKS-40 (Eaton - Bussmann Electrical Division) – Active status, super lag renewable link fuse with matching 40A/600VAC rating

Parameter Comparison

Engineering Selection Recommendations

KLSR040.T is the primary substitute for the 0LKS040.S. Both parts are manufactured by Littelfuse Inc., share identical current and AC voltage ratings, maintain cartridge form factor compatibility, and carry equivalent regulatory certifications (CE, CSA, UL). The KLSR040.T offers enhanced specifications including RK1 class rating, higher breaking capacity (200kA AC versus 10kA), and dual voltage capability (600 VAC / 300 VDC). The dimensional difference (5.500" L versus 4.248" L) requires verification of holder compatibility. KLSR040.T holds active product status with ROHS3 compliance, addressing obsolescence concerns.

LKS-40 serves as an alternative substitute, manufactured by Eaton - Bussmann Electrical Division with matching 40A/600VAC electrical specifications and active product status. This part maintains RoHS compliance. Detailed specifications for fuse class, breaking capacity, and dimensional compatibility are not provided in the available data.

Selection between KLSR040.T and LKS-40 depends on holder compatibility verification and system-specific requirements for breaking capacity and voltage range.

Frequently Asked Questions (FAQ)

Q: Can KLSR040.T directly replace 0LKS040.S in existing installations?

A: KLSR040.T matches the critical electrical parameters (40A, 600 VAC, fast-blow response, cartridge format) and regulatory certifications. However, the length difference (5.500" versus 4.248") requires confirmation that the existing holder accommodates the longer cartridge. Mechanical fit must be verified before installation.

Q: What is the significance of the fuse class difference between H and RK1?

A: Fuse class designates the breaking capacity and application range. Class H (0LKS040.S) has a 10kA breaking capacity, while Class RK1 (KLSR040.T) has a 200kA AC breaking capacity. RK1 provides enhanced protection in higher fault-current environments. Selection depends on the system's available fault current.

Q: Why is KLSR040.T rated for both 600 VAC and 300 VDC?

A: KLSR040.T is designed for dual-voltage applications. The 0LKS040.S specification does not include DC voltage rating. If the application requires DC operation, KLSR040.T provides this capability; if DC operation is not required, this additional rating does not affect AC performance.

Q: What does "Requires Holder" mean for cartridge fuses?

A: Cartridge fuses must be installed in a dedicated fuse holder or clip assembly. The fuse element itself (0LKS040.S, KLSR040.T, or LKS-40) cannot be directly connected to circuit terminals. The holder provides electrical contact and mechanical retention.

Q: Are there packaging differences between the substitutes?

A: KLSR040.T is supplied in Box packaging, while LKS-40 is supplied in Bulk packaging. Packaging does not affect electrical or mechanical performance; it reflects procurement and inventory considerations.

Q: How does RoHS compliance affect part selection?

A: The 0LKS040.S is RoHS non-compliant, while both KLSR040.T (ROHS3 compliant) and LKS-40 (RoHS compliant) meet current environmental standards. For new designs or systems subject to RoHS regulations, the compliant substitutes are required.