MBB
Make-before-break changeover contact
A make-before-break changeover contact establishes the next path before releasing the previous path during its documented transfer.
Schematic
IEEE / ANSI · MBB
ANSI/IEEE Make-before-break changeover contact form
IEEE-library reference for make-before-break changeover contact, with its operating meaning, connection notes and public vendor block identity.
In plain English
What does ANSI/IEEE Make-before-break changeover contact form mean?
This reference locates make-before-break changeover contact in Autodesk's IEEE-oriented miscellaneous switches family. A make-before-break changeover contact establishes the next path before releasing the previous path during its documented transfer. The temporary overlap must be understood for the connected circuits. The public library uses HSW1SC7_F 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
Identify any circuits that would be interconnected during the overlap. A break-before-make transfer opens the previous path before establishing the next. 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 reference for make-before-break changeover contact, with its operating meaning, connection notes and public vendor block identity. A break-before-make transfer opens the previous path before establishing the next.
- 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: Autodesk IEEE Symbol Preview — Miscellaneous Switches
IEEE / ANSI · Transfer Make Before Break Contact
Autodesk IEEE Symbol Preview: Miscellaneous Switches, block HSW1SC7_F. 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.
Schematic · MBB
What it represents
This reference locates make-before-break changeover contact in Autodesk's IEEE-oriented miscellaneous switches family. A make-before-break changeover contact establishes the next path before releasing the previous path during its documented transfer. The temporary overlap must be understood for the connected circuits. The public library uses HSW1SC7_F 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.
Identify any circuits that would be interconnected during the overlap. A break-before-make transfer opens the previous path before establishing the next. 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
- Identify any circuits that would be interconnected during the overlap.
- 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
- Label common and throw terminals
- State overlap sequence
- Reference connected-circuit compatibility
A distinction that matters
A break-before-make transfer opens the previous path before establishing the next.
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 — Miscellaneous Switches
Public IEEE-oriented Miscellaneous Switches table explicitly lists HSW1SC7_F as Transfer Make Before Break Contact. 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.
Explore related references
Put the reference into a drawing workflow.
Elora Grid helps electrical teams work with drawings, specifications and equipment information. Explore the drafting workflow or join the early-access waitlist.