LSYDB3K Snap Action Switch - Equivalent & Substitute Parts

Part Overview

The LSYDB3K 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 a roller plunger actuator and screw terminal connections. The switch operates at 10A AC (120V) and 800mA DC (115V), making it suitable for general-purpose control circuits requiring momentary switching action.

Substitute parts are identified when equivalent electrical and mechanical parameters allow direct replacement without circuit redesign. Substitution becomes necessary due to inventory availability, supply chain considerations, or end-of-life product transitions.

Substiute Parts

LSYDB3K

Honeywell Sensing and Productivity SolutionsIn Stock: 843LSYDB3K Datasheet

Current PartRFQ

D4A-3310N

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LSYDB3K with the D4A-3310N (Omron Automation and Safety) is based on the following alignment of critical parameters:

Electrical Compatibility:

• Both switches feature SPDT (DB/DM) circuit configuration
• Both operate in On-Mom (momentary) switch function
• Both support 10A AC current rating
• AC voltage ratings are compatible (120V vs. 125V nominal difference acceptable for AC applications)

Mechanical Compatibility:

• Both utilize roller plunger actuators
• Both employ chassis mount installation
• Both feature screw terminal connections
• Pretravel and differential travel specifications are equivalent (0.063"-0.071" pretravel; 0.016" differential travel)

Compliance & Handling:

• Both are RoHS Compliant
• Both carry MSL 1 (Unlimited) moisture sensitivity rating
• Both are classified under ECCN EAR99

Limiting Factors: The D4A-3310N operates at reduced DC current (6A vs. 800mA) and lower DC voltage (30V vs. 115V). The operating temperature range of the D4A-3310N (-10°C to 80°C) is narrower than the LSYDB3K (-40°C to 93°C). These differences must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

LSYDB3K Selection Criteria:

• Applications requiring DC operation at 115V or higher voltage levels
• Circuits demanding extended temperature operation from -40°C
• Systems requiring 800mA or higher DC current capacity
• Environments where ingress protection is not specified as a requirement
• Active product status with established supply chain

D4A-3310N Selection Criteria:

• Applications limited to DC operation at 30V maximum
• Circuits operating within -10°C to 80°C temperature range
• Systems where 6A DC current capacity is sufficient
• Environments requiring IP67 ingress protection (dust tight, waterproof)
• Active product status with established supply chain

Both parts are RoHS Compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, making them suitable for standard industrial control applications without special handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the D4A-3310N replace the LSYDB3K in all applications?

A: No. The D4A-3310N has a maximum DC voltage rating of 30V, while the LSYDB3K operates at 115V DC. If your circuit uses DC voltages above 30V, the D4A-3310N is not suitable. Additionally, the D4A-3310N operating temperature range (-10°C to 80°C) is narrower than the LSYDB3K (-40°C to 93°C).

Q: Are the mechanical dimensions compatible between these two switches?

A: The pretravel (0.063" vs. 0.071"), differential travel (0.016" identical), and overtravel (0.201" vs. 0.190") specifications are equivalent within standard mechanical tolerances. Both switches use roller plunger actuators, chassis mount installation, and screw terminals. Mechanical compatibility is confirmed.

Q: What is the difference in AC voltage ratings?

A: The LSYDB3K is rated for 120V AC, while the D4A-3310N is rated for 125V AC. This 5V nominal difference is standard in industrial AC applications and does not prevent substitution for AC circuits.

Q: Does the D4A-3310N offer any advantages over the LSYDB3K?

A: The D4A-3310N includes IP67 ingress protection (dust tight, waterproof) and a status indicator feature, which the LSYDB3K does not specify. The D4A-3310N also provides higher DC current capacity (6A vs. 800mA). However, these advantages are offset by lower DC voltage rating and narrower operating temperature range.

Q: Are both switches RoHS Compliant?

A: Yes. Both the LSYDB3K and D4A-3310N are RoHS Compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings, making them suitable for standard industrial applications without special handling or storage requirements.

Q: What is the operating force difference between these switches?

A: The LSYDB3K has an operating force of 1814gf, while the D4A-3310N has 1800gf. This 14gf difference is negligible and does not affect practical substitution compatibility.

Q: Can I use the D4A-3310N in a -40°C environment?

A: No. The D4A-3310N is rated for -10°C minimum operating temperature. If your application requires operation at -40°C, the LSYDB3K must be used.