SSW UNI
Unidirectional semiconductor power switch
A unidirectional semiconductor switch has a specified direction for its power conduction or control behaviour.
SLD / Schematic
IEEE / ANSI · SSW UNI
ANSI/IEEE Unidirectional semiconductor power switch form
IEEE-library form of unidirectional semiconductor power switch: a unidirectional semiconductor switch has a specified direction for its power conduction or control behaviour.
In plain English
What does ANSI/IEEE Unidirectional semiconductor power switch form mean?
This reference locates unidirectional semiconductor power switch in Autodesk's IEEE-oriented power switches family. A unidirectional semiconductor switch has a specified direction for its power conduction or control behaviour. The functional direction must be identified so reversing a schematic orientation does not reverse the intended meaning. The public library uses HCB11Q57 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.
A simple example
Read the operating mechanism and the contact reference state together. Cross-reference every associated contact to the same device and show which movement, signal or reset changes its condition; the symbol alone does not establish the complete switching sequence.
What the drawings help you do
Use terminal polarity and the product circuit rather than page orientation to determine direction. Unidirectional operation concerns the circuit path; it does not describe the direction of all system power flows. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted.
This particular reference
IEEE-library form of unidirectional semiconductor power switch: a unidirectional semiconductor switch has a specified direction for its power conduction or control behaviour. Unidirectional operation concerns the circuit path; it does not describe the direction of all system power flows.
- Normally open / normally closed
- The contact state in the normal condition defined for the drawing.
- Terminal
- An identified point where a conductor connects.
- Signal
- Electrical information passed between devices, rather than necessarily the main power supply.
Read the source: Autodesk IEEE Symbol Preview: Power Switches
IEEE / ANSI · 1P with Semiconductors - unidirectional
Autodesk IEEE Symbol Preview: Power Switches, block HCB11Q57. Matching functional counterpart linked separately. Independently drawn educational geometry; not a certified IEEE glyph or database identifier.
Shown as an independently authored educational illustration. Use the cited publication and drawing legend to verify the required drafting form.
SLD / Schematic · SSW UNI
What it represents
This reference locates unidirectional semiconductor power switch in Autodesk's IEEE-oriented power switches family. A unidirectional semiconductor switch has a specified direction for its power conduction or control behaviour. The functional direction must be identified so reversing a schematic orientation does not reverse the intended meaning. The public library uses HCB11Q57 for its horizontal representation; this is a vendor block name, not an IEEE standards symbol number.
Read the operating mechanism and the contact reference state together. Cross-reference every associated contact to the same device and show which movement, signal or reset changes its condition; the symbol alone does not establish the complete switching sequence.
Use terminal polarity and the product circuit rather than page orientation to determine direction. Unidirectional operation concerns the circuit path; it does not describe the direction of all system power flows. The linked functional counterpart explains the same operating role in its own drawing context; agreement of every detailed convention mark is not asserted.
How to read it
- Use terminal polarity and the product circuit rather than page orientation to determine direction.
- The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation.
Information to show or reference
- Show permitted conduction direction
- Identify control polarity
- Reference reverse-voltage capability
A distinction that matters
Unidirectional operation concerns the circuit path; it does not describe the direction of all system power flows.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Autodesk IEEE Symbol Preview: Power Switches
Public IEEE-oriented Power Switches table explicitly lists HCB11Q57 as 1P with Semiconductors - unidirectional. This supports the vendor convention context, not reproduction of the publisher graphic.
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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