LSYFB3K Snap Action Switch - Equivalent & Substitute Parts

Part Overview

The LSYFB3K is a snap action switch manufactured by Honeywell Sensing and Productivity Solutions, classified as an SPDT (Single Pole Double Throw) switch with chassis mount configuration. This component is rated for 10A AC at 120V and 800mA DC at 115V, featuring a side roller plunger actuator with screw terminal connections.

The LSYFB3K is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain system functionality, ensure continued availability, and support ongoing maintenance and repair operations for legacy equipment utilizing this switch component.

Substiute Parts

LSYFB3K

Honeywell Sensing and Productivity SolutionsIn Stock: 1062LSYFB3K Datasheet

Current PartRFQ

LSF3K

Honeywell Sensing and Productivity SolutionsIn Stock: 1096LSF3K Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete LSYFB3K is determined by strict equivalence across the following critical parameters:

Electrical Parameters: Circuit configuration (SPDT), switch function (On-Mom), current ratings (10A AC / 800mA DC), and voltage ratings (120V AC / 115V DC) must be identical.

Mechanical Parameters: Actuator type (side roller plunger), mounting configuration (chassis mount), and termination style (screw terminal) must match exactly.

Dimensional Parameters: Operating force (2720gf), pretravel (0.100"), differential travel (0.025"), and overtravel (0.190") establish the mechanical interface requirements.

Environmental & Compliance Parameters: Operating temperature range, RoHS compliance status, and MSL rating must be compatible with the original application requirements.

The LSF3K qualifies as a direct substitute based on identical electrical, mechanical, and dimensional specifications across all critical parameters.

Parameter Comparison

Engineering Selection Recommendations

The LSF3K is a direct functional equivalent to the obsolete LSYFB3K across all critical electrical, mechanical, and dimensional parameters. Both components are manufactured by Honeywell Sensing and Productivity Solutions within the HDLS series and maintain identical specifications for circuit configuration, current and voltage ratings, actuator type, mounting configuration, and termination style.

The primary distinction is product status: the LSYFB3K is obsolete while the LSF3K is currently in active production. This status difference ensures continued availability and supply chain support for the LSF3K.

One operational consideration exists: the LSF3K operates within a maximum temperature range of -12°C to 93°C, compared to the LSYFB3K range of -12°C to 121°C. Applications requiring operation above 93°C require evaluation against actual system temperature requirements.

Both components maintain RoHS compliance and MSL rating of 1 (Unlimited), ensuring compatibility with modern manufacturing and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can LSF3K directly replace LSYFB3K in existing equipment?

A: Yes. The LSF3K is electrically and mechanically equivalent to the LSYFB3K. Both components feature identical SPDT circuit configuration, 10A AC / 800mA DC current ratings, 120V AC / 115V DC voltage ratings, side roller plunger actuator, chassis mount configuration, and screw terminal termination. All mechanical parameters including operating force, pretravel, differential travel, and overtravel are identical.

Q: What is the difference between LSYFB3K and LSF3K?

A: The LSYFB3K is obsolete while the LSF3K is in active production. The operating temperature range differs: LSYFB3K operates from -12°C to 121°C, while LSF3K operates from -12°C to 93°C. All other electrical, mechanical, and dimensional specifications are identical.

Q: Are there temperature limitations when substituting LSF3K for LSYFB3K?

A: The LSF3K has a maximum operating temperature of 93°C compared to the LSYFB3K maximum of 121°C. Applications operating above 93°C require verification that system temperatures remain within the LSF3K specification. Applications operating at or below 93°C have no temperature-related limitations.

Q: Do both parts have the same RoHS and MSL ratings?

A: Yes. Both LSYFB3K and LSF3K are RoHS Compliant with MSL rating of 1 (Unlimited), ensuring compatibility with current manufacturing standards and storage requirements.

Q: What is the base product number for LSF3K?

A: The base product number for LSF3K is LSF3, indicating the core product line within the HDLS series.