LS NO
Normally-open limit switch
A normally-open limit switch closes when the documented mechanical travel or position condition actuates it.
Schematic
IEC · LS
IEC mechanical position-switch contact: 2 position switch normally open with detents and lamp
Mechanical position-switch contact form: 2 Position Switch Normally Open with Detents and Lamp.
In plain English
What does IEC mechanical position-switch contact: 2 position switch normally open with detents and lamp mean?
A mechanically operated position switch changes its contact state when travel, a cam or a lever reaches the documented operating condition. The operating mechanism mark explains how movement reaches the switch; the electrical contact still has to be read in its stated unoperated position. This entry identifies the 2 position switch normally open with detents and lamp form in the publisher's IEC-context family.
A simple example
A moving carriage may operate the switch near the end of travel, or an operator may move a multidirectional lever. Identify the actual direction or target position on the drawing and connect the switch tag to the corresponding mechanical detail. The normally-open designation starts with a non-conducting output or open contact in the documented reference condition; operation changes that state. The detent retains the lever position after operation; a retained indication and a spring-return position input require different operating logic.
What the drawings help you do
Detents retain an operating position and are different from a spring-return mechanism. The schematic does not supply operating travel, overtravel, contact force or a safety performance level; use the selected switch data for those properties.
This particular reference
Mechanical position-switch contact form: 2 Position Switch Normally Open with Detents and Lamp. This entry adds the 2 position switch normally open with detents and lamp detail to the broader mechanical position-switch contact family. Detents retain an operating position and are different from a spring-return mechanism. The schematic does not supply operating travel, overtravel, contact force or a safety performance level; use the selected switch data for those properties.
- Normally open / normally closed
- The contact state in the normal condition defined for the drawing.
- Signal
- Electrical information passed between devices, rather than necessarily the main power supply.
- Rating
- A value stating the conditions for which equipment is specified.
Read the source: AutoCAD Electrical: Limit switches
IEC · 2 Position Switch Normally Open with Detents and Lamp
Autodesk IEC-60617 Symbol Preview: Limit Switches, HLS11S78 / VLS11S78. This identifies the publisher's library context; exact IEC graphics and database identities are not asserted.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
Schematic · LS
What it represents
A mechanically operated position switch changes its contact state when travel, a cam or a lever reaches the documented operating condition. The actuator mark explains how movement reaches the switch; the electrical contact still has to be read in its stated unoperated position. This entry identifies the 2 position switch normally open with detents and lamp form in the publisher's IEC-context family.
A moving carriage may operate the switch near the end of travel, or an operator may move a multidirectional lever. Identify the actual direction or target position on the drawing and connect the switch tag to the corresponding mechanical detail. The normally-open designation starts with a non-conducting output or open contact in the documented reference condition; operation changes that state. The detent retains the lever position after actuation; a retained indication and a spring-return position input require different operating logic.
Detents retain an operating position and are different from a spring-return mechanism. The schematic does not supply operating travel, overtravel, contact force or a safety performance level; use the selected switch data for those properties.
How to read it
- The normally-open designation starts with a non-conducting output or open contact in the documented reference condition; operation changes that state.
- The detent retains the lever position after actuation; a retained indication and a spring-return position input require different operating logic.
- Detents retain an operating position and are different from a spring-return mechanism. The schematic does not supply operating travel, overtravel, contact force or a safety performance level; use the selected switch data for those properties.
Information to show or reference
- Name the position, movement or event that operates the switch.
- Show whether the mechanism returns or remains in a detent.
- Match terminals and contact state to the mechanical operating detail.
A distinction that matters
This entry adds the 2 position switch normally open with detents and lamp detail to the broader mechanical position-switch contact family. Detents retain an operating position and are different from a spring-return mechanism. The schematic does not supply operating travel, overtravel, contact force or a safety performance level; use the selected switch data for those properties.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
AutoCAD Electrical: Limit switches
Public Limit Switches table explicitly lists HLS11S78 / VLS11S78 with this operating or connection form. Vendor graphics are linked, not copied.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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