LSK5A-8A Equivalent & Substitute Parts Reference

Part Overview

The LSK5A-8A is a snap action SPDT (Single Pole Double Throw) switch manufactured by Honeywell Sensing and Productivity Solutions. This chassis mount switch is rated for 10A AC at 120V and 800mA DC at 115V, featuring a spring and cat whisker actuator with status indicator functionality. The LSK5A-8A is classified as obsolete, making identification of equivalent substitute parts essential for system maintenance, repair, and component sourcing in applications requiring SPDT snap action switching functionality.

Substiute Parts

LSK5A-8A

Honeywell Sensing and Productivity SolutionsIn Stock: 885LSK5A-8A Datasheet

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LSK8A-8A

Honeywell Sensing and Productivity SolutionsIn Stock: 802LSK8A-8A 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

Substitute parts for the LSK5A-8A are identified based on strict electrical and mechanical parameter compatibility within the snap action SPDT switch category. The substitution logic is based on the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration: SPDT (DB/DM) topology
• Switch function: On-Mom operation
• Mounting type: Chassis Mount
• Actuator type: Spring, Cat Whisker
• Current rating: Minimum 10A AC capability
• Voltage rating: Minimum 120V AC or equivalent DC rating
• Termination compatibility: Plug In or equivalent connection method
• Status indicator presence

Substitute Parts Identified:

1. LSK8A-8A (Honeywell Sensing and Productivity Solutions): Identical electrical specifications and mechanical parameters to the main part, with active product status and bulk packaging availability.

2. D4A-3E15N (Omron Automation and Safety): Functionally equivalent SPDT snap action switch with matching circuit topology and current rating. Differs in termination style (screw terminal vs. plug in), voltage rating (125V AC vs. 120V AC), and includes enhanced ingress protection (IP67).

Parameter Comparison

Engineering Selection Recommendations

LSK8A-8A Selection Criteria:

The LSK8A-8A represents the direct equivalent replacement for the obsolete LSK5A-8A. Both parts share identical electrical ratings (10A AC at 120V, 800mA DC at 115V), mechanical specifications (141gf operating force, 2.000" pretravel), and functional characteristics (SPDT On-Mom operation with status indicator). The LSK8A-8A maintains active product status with current manufacturing availability, ensuring long-term supply chain reliability. Both parts are RoHS compliant and feature identical plug-in termination. Selection of LSK8A-8A is appropriate for direct substitution in existing designs without circuit modification.

D4A-3E15N Selection Criteria:

The D4A-3E15N from Omron provides functional equivalence for applications where termination style flexibility is acceptable. This substitute maintains the critical SPDT circuit topology, 10A AC current rating, and On-Mom switch function. The D4A-3E15N features screw terminal connection (versus plug-in), requiring termination method adaptation. Voltage rating is 125V AC (5V higher than LSK5A-8A), suitable for 120V AC applications with margin. DC voltage rating (30V) exceeds the LSK5A-8A (115V), providing compatibility for higher DC voltage applications. The D4A-3E15N includes IP67 ingress protection and documented electrical life of 1,000,000 cycles. Operating temperature range (-10°C to 80°C) is narrower than the LSK5A-8A (-12°C to 93°C). Selection of D4A-3E15N is appropriate for applications requiring enhanced environmental protection or where screw terminal connection is preferred.

Frequently Asked Questions (FAQ)

Q: Can LSK8A-8A directly replace LSK5A-8A without circuit modification?

A: Yes. The LSK8A-8A is electrically and mechanically identical to the LSK5A-8A across all specified parameters. Both feature identical current ratings (10A AC, 800mA DC), voltage ratings (120V AC, 115V DC), operating force (141gf), pretravel (2.000"), and plug-in termination. Direct substitution is supported without design changes.

Q: What are the key differences between LSK8A-8A and D4A-3E15N?

A: The primary differences are termination style (LSK8A-8A uses plug-in; D4A-3E15N uses screw terminal), voltage ratings (LSK8A-8A: 120V AC/115V DC; D4A-3E15N: 125V AC/30V DC), operating temperature range (LSK8A-8A: -12°C to 93°C; D4A-3E15N: -10°C to 80°C), and ingress protection (D4A-3E15N includes IP67). Both maintain identical 10A AC current rating and SPDT circuit topology.

Q: Is the D4A-3E15N suitable for applications requiring 115V DC operation?

A: No. The D4A-3E15N is rated for 30V DC maximum, which is insufficient for 115V DC applications. The LSK8A-8A maintains the original 115V DC rating and is the appropriate selection for DC voltage applications at or near 115V.

Q: What is the impact of different pretravel specifications between LSK5A-8A and D4A-3E15N?

A: The LSK5A-8A specifies 2.000" (50.8mm) linear pretravel, while the D4A-3E15N specifies 15° angular pretravel. These represent different measurement methodologies for different actuator designs. Both switches maintain On-Mom functionality and identical operating force (141gf vs. 150gf). Pretravel differences may affect mechanical integration and should be evaluated for specific mounting configurations.

Q: Are all substitute parts RoHS compliant?

A: LSK8A-8A is RoHS compliant. D4A-3E15N is marked as "Not applicable" for RoHS status. For applications requiring RoHS compliance certification, LSK8A-8A is the appropriate selection.

Q: What is the inventory status for each part?

A: LSK5A-8A (obsolete): 796 pieces in stock. LSK8A-8A (active): 755 pieces in stock. D4A-3E15N (active): 945 pieces in stock. Active product status for LSK8A-8A and D4A-3E15N ensures ongoing availability for future procurement.