CB
Circuit breaker
A switching device that can interrupt a circuit, with specified fault-interruption capability.
SLD / Schematic
IEC · CB
IEC protective circuit-breaker form: with max. thermal and current protection
Protective circuit-breaker form form: With Max. Thermal and Current Protection.
In plain English
What does IEC protective circuit-breaker form: with max. thermal and current protection mean?
The breaker form combines a switching element with named automatic release functions. Thermal, magnetic, residual-current and undervoltage indications describe different operating causes; their presence must be read individually rather than treating every breaker as having the same protection. This entry identifies the with max. thermal and current protection form in the publisher's IEC-context family.
A simple example
On a feeder schematic, use the release indications to explain which measured condition can open the device. Put the selected trip settings, pole arrangement and supply dependencies in the equipment schedule and protection study, with the same breaker tag on both documents.
What the drawings help you do
The illustration does not specify an interrupting rating, trip curve, selectivity or isolation certification. An undervoltage release is also different from a shunt-trip coil: the condition that causes release must remain explicit.
This particular reference
Protective circuit-breaker form form: With Max. Thermal and Current Protection. This entry adds the with max. thermal and current protection detail to the broader protective circuit-breaker form family. The illustration does not specify an interrupting rating, trip curve, selectivity or isolation certification. An undervoltage release is also different from a shunt-trip coil: the condition that causes release must remain explicit.
- Coil
- A wound conductor that can produce a magnetic field when energised.
- Rating
- A value stating the conditions for which equipment is specified.
- Schematic
- A drawing showing function and connections rather than physical appearance.
Read the source: Circuit-breaker symbol variants
IEC · With Max. Thermal and Current Protection
Autodesk IEC-60617 Symbol Preview: 1 Pole Circuit Breakers, HCB11Q21 / VCB11Q21. 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 · CB
What it represents
The breaker form combines a switching element with named automatic release functions. Thermal, magnetic, residual-current and undervoltage indications describe different operating causes; their presence must be read individually rather than treating every breaker as having the same protection. This entry identifies the with max. thermal and current protection form in the publisher's IEC-context family.
On a feeder schematic, use the release indications to explain which measured condition can open the device. Put the selected trip settings, pole arrangement and supply dependencies in the equipment schedule and protection study, with the same breaker tag on both documents.
The illustration does not specify an interrupting rating, trip curve, selectivity or isolation certification. An undervoltage release is also different from a shunt-trip coil: the condition that causes release must remain explicit.
How to read it
- On a feeder schematic, use the release indications to explain which measured condition can open the device. Put the selected trip settings, pole arrangement and supply dependencies in the equipment schedule and protection study, with the same breaker tag on both documents.
- The illustration does not specify an interrupting rating, trip curve, selectivity or isolation certification. An undervoltage release is also different from a shunt-trip coil: the condition that causes release must remain explicit.
Information to show or reference
- List each protective release shown by the selected form.
- Reference settings, breaking capacity and pole protection separately.
- Identify auxiliary supplies and release circuits where applicable.
A distinction that matters
This entry adds the with max. thermal and current protection detail to the broader protective circuit-breaker form family. The illustration does not specify an interrupting rating, trip curve, selectivity or isolation certification. An undervoltage release is also different from a shunt-trip coil: the condition that causes release must remain explicit.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
Circuit-breaker symbol variants
Public 1 Pole Circuit Breakers table explicitly lists HCB11Q21 / VCB11Q21 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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Circuit breaker with undervoltage release
A breaker undervoltage release changes the breaker operating condition when its control voltage falls below the specified range.
SLD / Schematic
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