LSK3K-8C Equivalent & Substitute Parts Reference

Part Overview

The LSK3K-8C is an active-status snap action switch manufactured by Honeywell Sensing and Productivity Solutions. This SPDT (Single Pole Double Throw) switch is configured for chassis mount installation with screw terminal connections, rated for 10A AC at 120V and 800mA DC at 115V. The switch operates with a spring and coil actuator mechanism in an On-Momentary function.

Substitute parts are identified when equivalent electrical ratings, circuit configurations, and mechanical mounting specifications align with the original component, enabling direct replacement in applications where the main part becomes unavailable or inventory constraints require alternative sourcing.

Substiute Parts

LSK3K-8C

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

Current PartRFQ

D4A-1124N

Omron Automation and SafetyIn Stock: 798D4A-1124N Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

The D4A-1124N qualifies as a direct substitute based on the following alignment criteria:

Electrical Compatibility:

• Both parts feature SPDT (DB/DM) circuit configuration
• Both rated for 10A AC operation
• Both configured for On-Momentary switch function
• AC voltage ratings (120V vs. 125V) fall within acceptable industrial tolerance ranges for SPDT snap action switches

Mechanical Compatibility:

• Both employ chassis mount installation
• Both utilize screw terminal connections
• Both feature spring-actuated mechanisms

Regulatory Compliance:

• Both are RoHS Compliant
• Both carry ECCN EAR99 classification
• Both share identical HTSUS code (8536.50.9055)
• Both maintain MSL 1 (Unlimited) moisture sensitivity rating

Product Status:

• Both parts maintain Active product status, ensuring continued availability and support

Parameter Comparison

Engineering Selection Recommendations

Primary Substitution Criteria:

The D4A-1124N is qualified as a direct substitute for the LSK3K-8C based on matching SPDT circuit topology, identical 10A AC current rating, equivalent AC voltage rating (125V vs. 120V), and identical mounting and termination specifications. Both parts maintain Active product status and RoHS compliance.

Application-Specific Considerations:

DC voltage applications require evaluation. The LSK3K-8C is rated for 115V DC operation, while the D4A-1124N is rated for 30V DC maximum. Applications operating above 30V DC must retain the LSK3K-8C or identify alternative substitutes with higher DC voltage ratings.

Environmental Advantages:

The D4A-1124N provides IP67 ingress protection (dust tight, waterproof) compared to the LSK3K-8C, which has no specified ingress protection rating. Applications requiring environmental sealing benefit from the D4A-1124N specification.

Mechanical Interface Verification:

While both switches employ spring-actuated mechanisms with chassis mount and screw terminal configurations, the actuator geometry differs (coil vs. rod). Physical installation verification is necessary to confirm mechanical fit within the application enclosure and control panel layout.

Compliance Status:

Both parts carry identical regulatory classifications (ECCN EAR99, HTSUS 8536.50.9055, MSL 1) and RoHS compliance, enabling direct substitution in regulated supply chains without additional compliance documentation.

Frequently Asked Questions (FAQ)

Q: Can the D4A-1124N replace the LSK3K-8C in all applications?

A: Direct substitution is valid for AC applications at or below 120V and currents at or below 10A. DC applications must not exceed 30V, as the D4A-1124N is rated for 30V DC maximum compared to the LSK3K-8C 115V DC rating. Mechanical fit must be verified due to actuator geometry differences.

Q: What is the difference between the actuator types (coil vs. rod)?

A: The LSK3K-8C uses a spring and coil actuator, while the D4A-1124N uses a spring and rod actuator. Both provide On-Momentary switch function, but the physical geometry and engagement mechanism differ. Installation space and control panel layout compatibility must be confirmed before substitution.

Q: Are there voltage rating differences that affect substitution?

A: AC voltage ratings are equivalent within industrial tolerance (120V vs. 125V). DC voltage ratings differ significantly: LSK3K-8C is rated 115V DC, while D4A-1124N is rated 30V DC. Applications using DC voltage above 30V cannot use the D4A-1124N as a substitute.

Q: Does the D4A-1124N provide better environmental protection?

A: Yes. The D4A-1124N carries IP67 rating (dust tight, waterproof), while the LSK3K-8C has no specified ingress protection. Applications in wet, dusty, or corrosive environments benefit from the enhanced environmental sealing of the D4A-1124N.

Q: Are both parts currently available for procurement?

A: Both parts maintain Active product status. The LSK3K-8C has 753 pieces in stock, and the D4A-1124N has 719 pieces in stock. Both manufacturers continue active production and support.

Q: What compliance certifications apply to both parts?

A: Both parts are RoHS Compliant, carry ECCN EAR99 classification, share HTSUS code 8536.50.9055, and maintain MSL 1 (Unlimited) moisture sensitivity rating. No additional compliance documentation is required for direct substitution.

Q: Can the D4A-1124N handle higher current than the LSK3K-8C?

A: Both parts are rated for 10A AC operation. For DC current, the D4A-1124N is rated 6A compared to the LSK3K-8C 800mA (0.8A). The D4A-1124N provides higher DC current capacity, making it suitable for applications requiring increased DC current handling.

Q: What is the operating temperature range difference?

A: The LSK3K-8C operates from -12°C to 93°C, while the D4A-1124N operates from -20°C to 100°C. The D4A-1124N provides a wider operating temperature range, beneficial for extreme temperature applications.