LSD3K Snap Action Switch - Equivalent & Substitute Parts

Part Overview

The LSD3K 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 LSD3K operates at 10A AC (120V) and 800mA DC (115V), making it suitable for industrial control and automation circuits requiring momentary switching action.

Equivalent and substitute parts are identified to provide component selection flexibility due to inventory availability, supply chain considerations, or application-specific parameter requirements within the allowed electrical and mechanical specifications for this switch category.

Substiute Parts

LSD3K

Honeywell Sensing and Productivity SolutionsIn Stock: 1031LSD3K Datasheet

Current PartRFQ

D4A-3310N

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

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LSD3K with the D4A-3310N is based on the following alignment of critical electrical and mechanical parameters:

Matching Parameters:

• Circuit Configuration: Both SPDT (DB/DM)
• Switch Function: Both On-Mom (Momentary)
• Current Rating (AC): Both 10A
• Actuator Type: Both Roller Plunger
• Mounting Type: Both Chassis Mount
• Termination Style: Both Screw Terminal
• Differential Travel: Both 0.016" (0.4mm)
• RoHS Status: Both RoHS Compliant
• MSL Rating: Both 1 (Unlimited)
• ECCN Classification: Both EAR99
• HTSUS Code: Both 8536.50.9055

Allowable Parameter Variations: The D4A-3310N operates at 125V AC (versus 120V AC for LSD3K) and 30V DC (versus 115V DC for LSD3K), representing acceptable voltage rating increases within industrial switch specifications. DC current rating differs (6A versus 800mA), with the substitute providing higher capacity. Operating force (1800gf versus 1814gf) and pretravel (0.063" versus 0.071") are within acceptable mechanical tolerance ranges. Operating temperature range (-10°C to 80°C versus -12°C to 93°C) represents a narrower specification on the substitute part.

Parameter Comparison

Engineering Selection Recommendations

Both the LSD3K and D4A-3310N are active-status products with RoHS compliance and identical MSL ratings, making them suitable for equivalent component selection in industrial control applications.

LSD3K Selection Criteria:

• Required when DC voltage rating of 115V is specified in circuit design
• Preferred for applications requiring extended operating temperature range (-12°C to 93°C)
• Suitable for DC current loads up to 800mA

D4A-3310N Selection Criteria:

• Acceptable substitute when AC voltage rating of 125V meets or exceeds circuit requirements
• Suitable for DC voltage applications limited to 30V maximum
• Preferred when DC current capacity of 6A is required
• Acceptable for operating temperature range of -10°C to 80°C
• Provides IP67 ingress protection rating (dust tight, waterproof) not specified for LSD3K
• Includes status indicator feature not present on LSD3K

Both parts share identical SPDT circuit configuration, 10A AC current rating, momentary switch function, roller plunger actuator, chassis mount design, and screw terminal termination. Selection between these parts depends on specific voltage, current, temperature, and environmental protection requirements of the target application.

Frequently Asked Questions (FAQ)

Q: Can the D4A-3310N replace the LSD3K in all applications?

A: The D4A-3310N is electrically compatible for SPDT momentary switching at 10A AC. However, application compatibility depends on three factors: (1) DC voltage requirement—if your circuit requires 115V DC, the D4A-3310N's 30V DC rating is insufficient; (2) Operating temperature—if ambient temperature drops below -10°C or exceeds 80°C, the D4A-3310N falls outside its rated range; (3) DC current load—if your application requires more than 800mA DC, the D4A-3310N's 6A rating provides adequate capacity.

Q: What are the key mechanical differences between these switches?

A: Operating force differs by 14gf (1814gf versus 1800gf), pretravel by 0.008" (0.2mm), and overtravel by 0.011" (0.3mm). These differences fall within standard mechanical tolerance ranges for snap action switches and do not affect functional compatibility in standard industrial control circuits. Both switches maintain identical differential travel of 0.016" (0.4mm).

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

A: The D4A-3310N provides IP67 ingress protection (dust tight, waterproof), while the LSD3K does not specify an ingress protection rating. This additional protection on the D4A-3310N does not create incompatibility; it represents an enhanced feature. Applications requiring environmental protection benefit from the D4A-3310N's IP67 rating.

Q: Are both parts suitable for RoHS-compliant assemblies?

A: Yes. Both the LSD3K and D4A-3310N carry RoHS Compliant status and MSL 1 (Unlimited) ratings, making them suitable for RoHS-compliant manufacturing and assembly processes without moisture sensitivity constraints.

Q: What is the significance of the identical HTSUS and ECCN codes?

A: Both parts share HTSUS code 8536.50.9055 and ECCN classification EAR99, indicating identical tariff classification and export control status. This alignment simplifies procurement, customs documentation, and supply chain management when substituting between these parts.

Q: Which part should be selected for a -15°C operating environment?

A: Neither part is rated for -15°C operation. The LSD3K minimum operating temperature is -12°C, and the D4A-3310N minimum is -10°C. For applications requiring operation below -12°C, alternative switch models with extended low-temperature ratings must be specified.