LSR3K-4M Equivalent & Substitute Parts Reference

Part Overview

The LSR3K-4M is a snap action SPDT (Single Pole Double Throw) switch manufactured by Honeywell Sensing and Productivity Solutions. This chassis-mounted switch is rated for 10A AC at 120V and 800mA DC at 115V, featuring a side rotary adjustable rod actuator with screw terminal connections. The LSR3K-4M is classified as obsolete, making identification of compatible substitute parts essential for system maintenance, repair, and component sourcing. The active substitute part 1LS10-L provides functional equivalence while maintaining current product availability.

Substiute Parts

LSR3K-4M

Honeywell Sensing and Productivity SolutionsIn Stock: 1028LSR3K-4M Datasheet

Current PartRFQ

1LS10-L

Honeywell Sensing and Productivity SolutionsIn Stock: 11191LS10-L Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The 1LS10-L qualifies as a direct substitute for the LSR3K-4M based on the following matching parameters:

Electrical Equivalence:

• Identical circuit configuration: SPDT (DB/DM)
• Identical switch function: On-Mom
• Identical AC current rating: 10A at 120V
• Identical DC current rating: 800mA
• DC voltage rating: 125V (exceeds LSR3K-4M requirement of 115V)

Mechanical Equivalence:

• Identical actuator type: Side Rotary, Adjustable Rod
• Identical mounting type: Chassis Mount
• Identical termination style: Screw Terminal
• Identical operating force: 19gfm

Regulatory Equivalence:

• Both RoHS Compliant
• Both MSL Rating 1 (Unlimited)
• Both manufactured by Honeywell Sensing and Productivity Solutions

Substitution Basis: The 1LS10-L maintains all critical electrical and mechanical parameters required for direct substitution. The higher DC voltage rating (125V vs. 115V) provides additional margin without creating incompatibility. The primary distinction is product status: LSR3K-4M is obsolete while 1LS10-L is active, with 1092 units currently in stock versus 988 units of the obsolete part.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitution Criteria Met:

The 1LS10-L is electrically and mechanically equivalent to the LSR3K-4M for standard applications. Both parts maintain identical SPDT circuit configuration, 10A AC / 800mA DC current ratings, 120V AC / 115V-125V DC voltage ratings, side rotary adjustable rod actuation, chassis mounting, and screw terminal connections. Both parts are RoHS Compliant with MSL Rating 1 (Unlimited).

Operational Considerations:

The 1LS10-L exhibits different travel characteristics (pretravel, differential travel, and overtravel) compared to the LSR3K-4M. The substitute has 20° pretravel versus 15°, 12° differential travel versus 5°, and 30° overtravel versus 60°. These differences affect the mechanical response profile but do not prevent functional substitution in applications where the original LSR3K-4M was specified.

The 1LS10-L operates within a narrower temperature range (-29°C ~ 71°C) compared to the LSR3K-4M (-1°C ~ 121°C). Applications requiring operation at temperatures below -29°C or above 71°C require verification that the substitute meets environmental requirements.

The 1LS10-L provides IP67 ingress protection (dust tight, waterproof), which exceeds the LSR3K-4M specification. This enhancement is compatible with all applications and provides additional environmental protection.

Compliance Status:

Both parts are RoHS Compliant and carry identical MSL ratings. The 1LS10-L is active production with 1092 units in stock, ensuring long-term availability compared to the obsolete LSR3K-4M.

Frequently Asked Questions (FAQ)

Q: Can the 1LS10-L directly replace the LSR3K-4M in existing equipment?

A: The 1LS10-L is electrically and mechanically equivalent for the core switching function. Both parts feature identical SPDT circuit configuration, 10A AC / 800mA DC current ratings, 120V AC voltage rating, side rotary adjustable rod actuation, chassis mounting, and screw terminal connections. Direct physical and electrical substitution is supported.

Q: What are the differences in travel characteristics between these parts?

A: The 1LS10-L has different mechanical travel specifications: 20° pretravel (versus 15°), 12° differential travel (versus 5°), and 30° overtravel (versus 60°). These differences affect the mechanical response profile and actuation feel but do not prevent functional substitution in standard applications.

Q: Does the 1LS10-L operate across the same temperature range as the LSR3K-4M?

A: No. The LSR3K-4M operates from -1°C to 121°C, while the 1LS10-L operates from -29°C to 71°C. The substitute has a narrower upper temperature limit. Applications requiring operation above 71°C must verify compatibility with the substitute part.

Q: What is the packaging difference between these parts?

A: The LSR3K-4M is supplied in unspecified packaging, while the 1LS10-L is supplied in bulk packaging. This difference affects order quantities and handling but does not impact electrical or mechanical performance.

Q: Are both parts RoHS Compliant?

A: Yes. Both the LSR3K-4M and 1LS10-L are RoHS Compliant with MSL Rating 1 (Unlimited moisture sensitivity level). Both parts meet current regulatory requirements.

Q: What is the significance of the LSR3K-4M being obsolete?

A: The LSR3K-4M is classified as obsolete, indicating it is no longer in active production. The 1LS10-L is an active product with current inventory (1092 units in stock), ensuring availability for new designs and replacement applications.

Q: Does the 1LS10-L provide any additional features compared to the LSR3K-4M?

A: The 1LS10-L includes IP67 ingress protection (dust tight, waterproof), which is not specified for the LSR3K-4M. This enhancement provides additional environmental protection without creating incompatibility.

Q: Are both parts manufactured by the same company?

A: Yes. Both the LSR3K-4M and 1LS10-L are manufactured by Honeywell Sensing and Productivity Solutions, ensuring consistent quality and design standards.