Honeywell 111SM858-H403 Basic Switch Guide for Lever Actuated Control
The Honeywell 111SM858-H403 basic switch is a subminiature electromechanical switch designed for applications that benefit from lever-based actuation and durable snap-action performance. Within the Honeywell SM Series, this model offers a useful combination of SPDT contact flexibility, compact size, and long mechanical life for industrial and equipment-level switching tasks.
What Is the Honeywell 111SM858-H403 Basic Switch?
The Honeywell 111SM858-H403 electromechanical switch is generally listed as an SPDT on-momentary switch with a straight lever actuator. Compared with pin plunger versions, a lever-actuated design can be advantageous when the mechanical interface requires more travel accommodation or when the moving part does not strike the switch body in a purely direct manner.
Technical Characteristics
This Honeywell basic switch is commonly specified at 5 A for AC/DC loads with voltage ratings up to 250 V AC and 30 V DC. It uses chassis mounting and quick connect 0.110 inch termination. Typical operating force is 198 gf, while release force is 57 gf. Operating position is around 8.9 mm, pretravel is approximately 5.5 mm, differential travel is about 0.76 mm, and overtravel is also around 0.76 mm. Mechanical life is listed up to 10,000,000 cycles, with an operating temperature range of roughly -55°C to 125°C.
Why Lever Actuation Can Matter
The 111SM858-H403 basic switch is particularly useful when a moving surface, cam, linkage, or mechanism benefits from lever engagement rather than direct plunger pressure. This can reduce alignment sensitivity in some assemblies and make the switch easier to integrate into dynamic mechanical systems. In practice, lever-style actuation often supports smoother contact with moving components.
Application Perspective
The 111SM858-H403 electromechanical switch can be relevant in industrial controls, mechanism monitoring, machine status detection, compact automation assemblies, and equipment requiring repeatable end-of-travel or position confirmation. The combination of SPDT switching and a robust mechanical life rating helps it remain useful across both new equipment design and replacement maintenance scenarios.
For designers who need a compact Honeywell lever basic switch with dependable switching performance, this model offers a practical engineering profile without unnecessary complexity.
FAQ
What actuator style does the 111SM858-H403 basic switch use?
It is generally listed with a straight lever actuator. This makes it different from pin plunger variants in the same broader switch family.
What are the electrical ratings of the Honeywell 111SM858-H403 electromechanical switch?
This model is typically specified at 5 A with rated voltages up to 250 V AC and 30 V DC. As always, final product selection should match the exact circuit and environmental requirements.
Why would an engineer choose a lever-actuated Honeywell basic switch?
A lever actuator can improve compatibility with moving mechanical parts such as cams, arms, guides, or surfaces that do not align perfectly with a direct plunger-style input. It can simplify mechanical interfacing in the right design.
Is the Honeywell 111SM858-H403 suitable for repeated cycling?
Yes. It is commonly listed with a mechanical life of up to 10 million cycles, which supports long-term use in repetitive switching applications.
Where is the Honeywell 111SM858-H403 basic switch commonly applied?
It can be used in industrial equipment, position detection systems, mechanism interlocks, and compact machinery where lever-based snap-action switching is appropriate.
For more information about Honeywell, review related switch families and actuator configurations.