LSF3K Snap Action Switch - Equivalent & Substitute Parts

Part Overview

The LSF3K is an active-status snap action switch manufactured by Honeywell Sensing and Productivity Solutions. It is configured as a Single Pole Double Throw (SPDT) switch with a side roller plunger actuator, rated for 10A AC at 120V and 800mA DC at 115V. The switch features chassis mount installation with screw terminal connections and operates across a temperature range of -12°C to 93°C.

Finding equivalent and substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and maintain compatibility with system requirements when the primary part becomes unavailable or when alternative sourcing is required.

Substiute Parts

LSF3K

Honeywell Sensing and Productivity SolutionsIn Stock: 1096LSF3K Datasheet

Current PartRFQ

D4A-3307-HN

Omron Automation and SafetyIn Stock: 908D4A-3307-HN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LSF3K is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Criteria:

• Circuit configuration must be SPDT (DB/DM)
• Switch function must be On-Momentary
• Actuator type must be Side Roller Plunger
• Mounting type must be Chassis Mount
• Termination style must be Screw Terminal
• Current and voltage ratings must meet or exceed application requirements
• Operating temperature range must encompass the application environment
• RoHS compliance status must match regulatory requirements

The D4A-3307-HN from Omron Automation and Safety qualifies as a substitute based on matching circuit configuration, switch function, actuator type, mounting type, and termination style. Both parts are active-status products with RoHS compliance and MSL 1 ratings.

Parameter Comparison

Engineering Selection Recommendations

LSF3K Selection Criteria:

• Applications requiring extended operating temperature range (-12°C to 93°C)
• Systems where higher operating force (2720gf) is acceptable or required
• Designs optimized for Honeywell component ecosystems

D4A-3307-HN Selection Criteria:

• Applications operating within -10°C to 80°C temperature range
• Systems benefiting from lower operating force (2000gf) for reduced actuator wear
• Designs requiring IP67 ingress protection (dust tight, waterproof)
• Applications where higher DC voltage rating (30V) or DC current capacity (6A) provides design margin
• Omron component integration requirements

Both parts maintain active product status and full RoHS compliance, ensuring regulatory alignment and long-term availability. Selection between these parts should be based on specific application temperature requirements, ingress protection needs, and actuator force specifications.

Frequently Asked Questions (FAQ)

Q: Can the D4A-3307-HN directly replace the LSF3K in all applications?

A: Direct replacement is possible for applications operating within the D4A-3307-HN temperature range (-10°C to 80°C). The LSF3K supports extended low-temperature operation to -12°C. Applications requiring temperatures below -10°C or above 80°C must use the LSF3K. Both parts share identical circuit configuration, switch function, actuator type, mounting type, and termination style.

Q: What is the significance of the different operating force ratings?

A: The LSF3K requires 2720gf operating force, while the D4A-3307-HN requires 2000gf. This difference affects actuator design and mechanical wear characteristics. Applications with force-sensitive actuators should verify compatibility with the specific operating force of the selected part.

Q: Are there packaging differences between these parts?

A: The LSF3K is supplied in standard packaging, while the D4A-3307-HN is supplied in bulk packaging. Packaging differences do not affect electrical or mechanical performance but may impact inventory management and handling procedures.

Q: Does the D4A-3307-HN's IP67 rating affect substitution suitability?

A: The D4A-3307-HN includes IP67 ingress protection (dust tight, waterproof), which the LSF3K does not specify. This additional protection in the D4A-3307-HN makes it suitable for applications requiring environmental sealing. The LSF3K may be used in applications where ingress protection is not required.

Q: How do the pretravel and overtravel specifications compare?

A: Pretravel differs by 0.006" (0.1mm), and overtravel differs by 0.011" (0.3mm). These differences are functionally equivalent for standard snap action switch applications. Both parts maintain identical differential travel of 0.025" (0.6mm).

Q: Are both parts suitable for DC applications?

A: Both parts support DC operation. The LSF3K is rated for 800mA DC at 115V, while the D4A-3307-HN is rated for 6A DC at 30V. Selection depends on specific DC voltage and current requirements of the application.