LSYDC3K Snap Action Switch - Equivalent & Substitute Parts

Part Overview

The LSYDC3K is an active-status snap action switch manufactured by Honeywell Sensing and Productivity Solutions. This SPDT (Single Pole Double Throw) switch is designed for chassis mount applications with screw terminal connections. The switch operates at 10A AC (120V) and 800mA DC (115V) with a roller plunger actuator, making it suitable for industrial control and automation circuits requiring momentary contact operation.

Substitute parts are identified to provide alternative sourcing options when the primary LSYDC3K is unavailable, while maintaining functional and electrical compatibility within specified parameter ranges.

Substiute Parts

LSYDC3K

Honeywell Sensing and Productivity SolutionsIn Stock: 1055LSYDC3K Datasheet

Current PartRFQ

D4A-3310N

Omron Automation and SafetyIn Stock: 943D4A-3310N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LSYDC3K with the D4A-3310N (Omron Automation and Safety) is based on alignment of the following critical parameters:

Matched Parameters:

• Circuit configuration: Both SPDT (DB/DM)
• Switch function: Both On-Mom (momentary contact)
• AC current rating: Both 10A
• Actuator type: Both roller plunger
• Mounting type: Both chassis mount
• Termination style: Both screw terminal
• Differential travel: Both 0.016 in (0.4 mm)
• RoHS compliance: Both compliant
• MSL rating: Both 1 (Unlimited)

Differing Parameters:

• AC voltage rating: LSYDC3K 120V vs. D4A-3310N 125V (D4A-3310N rated higher)
• DC current rating: LSYDC3K 800mA vs. D4A-3310N 6A (D4A-3310N rated higher)
• DC voltage rating: LSYDC3K 115V vs. D4A-3310N 30V (D4A-3310N rated higher)
• Operating force: LSYDC3K 1814gf vs. D4A-3310N 1800gf (within 1% tolerance)
• Pretravel: LSYDC3K 0.071 in vs. D4A-3310N 0.063 in (within acceptable mechanical variance)
• Overtravel: LSYDC3K 0.190 in vs. D4A-3310N 0.201 in (within acceptable mechanical variance)
• Operating temperature: LSYDC3K −12 to 121°C vs. D4A-3310N −10 to 80°C (LSYDC3K has wider range)
• Ingress protection: D4A-3310N includes IP67 rating; LSYDC3K does not specify
• Additional features: D4A-3310N includes status indicator; LSYDC3K does not

The D4A-3310N meets or exceeds the electrical requirements of the LSYDC3K for AC applications and provides enhanced DC current capacity. Mechanical actuation characteristics remain functionally equivalent.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (LSYDC3K): The LSYDC3K remains the specified component for applications requiring the full operating temperature range of −12 to 121°C. This part is active-status with RoHS compliance and unlimited moisture sensitivity rating, suitable for standard industrial control environments.

Substitute Part (D4A-3310N): The D4A-3310N is suitable as a substitute for applications operating within the −10 to 80°C temperature range. This part provides equivalent AC switching performance at 10A/120V and enhanced DC current capacity (6A vs. 800mA). The D4A-3310N includes IP67 ingress protection and a status indicator, providing additional functionality not present in the LSYDC3K. Both parts are active-status, RoHS-compliant, and carry identical MSL ratings.

Selection Criteria:

• Use LSYDC3K when operating temperature range below −10°C or above 80°C is required
• Use D4A-3310N when DC current requirements exceed 800mA or when IP67 environmental protection is needed
• Both parts are mechanically and electrically compatible for standard AC momentary switching applications at 10A/120V

Frequently Asked Questions (FAQ)

Q: Can the D4A-3310N replace the LSYDC3K in all applications?

A: The D4A-3310N is functionally equivalent for AC switching applications within the −10 to 80°C operating range. Applications requiring operation below −10°C or above 80°C must use the LSYDC3K, which has a wider temperature specification (−12 to 121°C).

Q: What are the mechanical differences between these switches?

A: Operating force differs by approximately 1% (1814gf vs. 1800gf). Pretravel and overtravel measurements differ slightly but remain within acceptable mechanical tolerances for chassis-mount snap action switches. Differential travel is identical at 0.016 in (0.4 mm).

Q: Are the screw terminals compatible between LSYDC3K and D4A-3310N?

A: Both switches use screw terminal connections and are designed for chassis mount applications. Terminal compatibility depends on the specific circuit board or panel layout; physical dimensions should be verified against the respective datasheets before installation.

Q: Does the D4A-3310N's IP67 rating affect substitution suitability?

A: The IP67 rating on the D4A-3310N provides additional environmental protection (dust-tight, waterproof) compared to the LSYDC3K. This is an enhancement that does not prevent substitution; however, if the application specifically requires the absence of sealed construction, the LSYDC3K should be retained.

Q: What is the significance of the status indicator on the D4A-3310N?

A: The D4A-3310N includes a status indicator feature not present on the LSYDC3K. This feature provides visual confirmation of switch state. If the application circuit does not utilize this indicator, it does not affect functional substitution.

Q: Are both parts RoHS compliant?

A: Yes. Both the LSYDC3K and D4A-3310N are RoHS compliant with MSL rating 1 (Unlimited), suitable for applications requiring environmental compliance certification.

Q: What is the difference in DC current ratings?

A: The LSYDC3K is rated for 800mA DC at 115V. The D4A-3310N is rated for 6A DC at 30V. For DC applications requiring current above 800mA, the D4A-3310N provides higher capacity. For applications using only the 800mA DC specification, both parts are equivalent.