LSYKC3K-8C Equivalent & Substitute Parts Reference

Part Overview

The LSYKC3K-8C is a snap action SPDT (Single Pole Double Throw) switch manufactured by Honeywell Sensing and Productivity Solutions, designed for chassis mount applications with screw terminal connections. This component operates at 10A AC (120V) and 800mA DC (115V) with a spring and coil actuator mechanism. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. Substitute components must maintain electrical compatibility across AC/DC voltage and current ratings while preserving mechanical mounting and termination characteristics.

Substiute Parts

LSYKC3K-8C

Honeywell Sensing and Productivity SolutionsIn Stock: 868LSYKC3K-8C Datasheet

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LSK3K-8C

Honeywell Sensing and Productivity SolutionsIn Stock: 778LSK3K-8C Datasheet

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D4A-3115N

Omron Automation and SafetyIn Stock: 783D4A-3115N Datasheet

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D4A-3315N

Omron Automation and SafetyIn Stock: 972D4A-3315N Datasheet

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D4A-3E15N

Omron Automation and SafetyIn Stock: 1004D4A-3E15N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LSYKC3K-8C is determined by the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration must be SPDT (DB/DM)
• Switch function must be On-Mom (momentary operation)
• Mounting type must be Chassis Mount
• Termination style must be Screw Terminal
• AC current rating must support minimum 10A
• AC voltage rating must support minimum 120V

Secondary Compatibility Considerations:

• DC current and voltage ratings may vary within application requirements
• Operating force variations are acceptable within mechanical design tolerances
• Actuator type variations (Spring/Coil vs. Spring/Cat Whisker) are permissible if electrical performance is maintained
• Operating temperature range may differ based on application environment
• Ingress protection ratings may exceed minimum requirements

The substitute parts LSK3K-8C, D4A-3115N, D4A-3315N, and D4A-3E15N meet these primary criteria while maintaining functional equivalence for SPDT snap action switching applications.

Parameter Comparison

Engineering Selection Recommendations

LSK3K-8C (Honeywell): This part represents the direct equivalent within the Honeywell HDLS series. It maintains identical electrical ratings (10A AC at 120V, 800mA DC at 115V), actuator type (Spring, Coil), and mechanical specifications (198gf operating force, 2.000" pretravel). The LSK3K-8C is classified as Active product status, ensuring ongoing availability and supply chain continuity. The primary operational difference is a reduced upper temperature limit (-12°C ~ 93°C versus -12°C ~ 121°C). This part is recommended for direct replacement in applications where the original LSYKC3K-8C specifications are required and Honeywell component continuity is preferred.

D4A-3115N, D4A-3315N, D4A-3E15N (Omron): These Omron D4A series switches provide functional equivalence with enhanced specifications. All three parts maintain the required 10A AC at 125V rating (exceeding the 120V requirement) and SPDT momentary operation. The Omron parts feature IP67 ingress protection (dust tight, waterproof), which exceeds the original specification. Operating force is reduced to 150gf, and pretravel is specified as 15° rather than linear measurement. DC current rating is elevated to 6A (exceeding the 800mA requirement), though DC voltage is limited to 30V. All three Omron parts are classified as Active product status with 1,000,000 cycle electrical life rating.

D4A-3315N and D4A-3E15N include status indicator features not present in the original part. D4A-3E15N carries "Not applicable" RoHS status, whereas D4A-3115N and D4A-3315N are RoHS Compliant. Selection between these three Omron variants depends on application requirements for status indication and RoHS compliance certification.

Frequently Asked Questions (FAQ)

Q: Can the LSK3K-8C directly replace the LSYKC3K-8C in all applications?

A: The LSK3K-8C is electrically and mechanically equivalent to the LSYKC3K-8C with one exception: the upper operating temperature limit is reduced from 121°C to 93°C. Direct replacement is suitable for applications operating within the -12°C to 93°C range. Applications requiring operation above 93°C require evaluation of alternative substitutes or thermal management modifications.

Q: What are the key differences between Honeywell and Omron substitute options?

A: The Honeywell LSK3K-8C maintains identical mechanical specifications (198gf operating force, 2.000" pretravel) and actuator type (Spring, Coil). The Omron D4A series switches feature different actuator technology (Spring, Cat Whisker), reduced operating force (150gf), angular pretravel specification (15°), and enhanced ingress protection (IP67). Omron parts provide higher DC current capability (6A versus 800mA) but lower DC voltage rating (30V versus 115V).

Q: Are the Omron D4A-3115N, D4A-3315N, and D4A-3E15N interchangeable?

A: These three Omron parts share identical electrical and mechanical specifications. D4A-3315N and D4A-3E15N include status indicator features not present in D4A-3115N. D4A-3E15N carries "Not applicable" RoHS status, while D4A-3115N and D4A-3315N are RoHS Compliant. Selection depends on application requirements for status indication and regulatory compliance documentation.

Q: What is the significance of the pretravel specification difference (2.000" versus 15°)?

A: The LSYKC3K-8C and LSK3K-8C specify pretravel as linear distance (2.000" or 50.8mm), while Omron D4A series parts specify pretravel as angular measurement (15°). These represent different measurement methodologies for the same functional characteristic. Both specifications indicate the actuator travel distance before electrical contact occurs. Mechanical compatibility depends on the specific mounting configuration and actuator design of the application.

Q: Can Omron D4A switches be used in applications requiring operation above 100°C?

A: The Omron D4A-3115N operates to 100°C maximum. D4A-3315N and D4A-3E15N are limited to 80°C maximum. The original LSYKC3K-8C operates to 121°C. Applications requiring sustained operation above 100°C should retain the LSK3K-8C (93°C limit) or evaluate alternative component families designed for extended temperature ranges.

Q: What is the impact of the 30V DC voltage limit on Omron D4A switches?

A: Omron D4A series switches are rated for 30V DC maximum, compared to 115V DC for the original LSYKC3K-8C and LSK3K-8C. Applications utilizing DC voltages above 30V cannot use Omron D4A substitutes. Applications operating at 30V DC or below can utilize Omron parts, which provide 6A DC current capability (exceeding the 800mA requirement).

Q: Are all substitute parts RoHS Compliant?

A: LSK3K-8C, D4A-3115N, and D4A-3315N are RoHS Compliant. D4A-3E15N carries "Not applicable" RoHS status. Applications requiring RoHS Compliant component documentation should specify LSK3K-8C, D4A-3115N, or D4A-3315N.

Q: What inventory availability should be considered for procurement?

A: Current inventory levels are: LSYKC3K-8C (768 pcs), LSK3K-8C (753 pcs), D4A-3115N (723 pcs), D4A-3315N (941 pcs), D4A-3E15N (945 pcs). All parts are available as new original stock. Procurement decisions should account for application volume requirements and supply chain lead times.