# IEC protective circuit-breaker form: with current protection Canonical URL: https://eloragrid.ai/symbols/iec-protective-circuit-breaker-form-with-current-protection Publisher: Elora Grid Updated: 2026-10-28 Lookup label: CB Drawing use: Schematic Reference families: IEC, Manufacturer ## Symbol convention Convention: IEC Form: With Current Protection Autodesk IEC-60617 Symbol Preview: 1 Pole Circuit Breakers, HCB11Q29 / VCB11Q29. This identifies the publisher's library context; exact IEC graphics and database identities are not asserted. Protective circuit-breaker form form: With Current Protection. ## In plain English ### What does IEC protective circuit-breaker form: with 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 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 Current Protection. This entry adds the with 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. ### Terms - 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. Concept diagram: Identify the device and form → Read the connections and state → Check the equipment reference A guide to reading this reference. The original symbol illustration and its drawing notes appear below; these boxes are not a wiring diagram. - [Circuit-breaker symbol variants](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-DB1548A3-A4D3-47E5-86AC-37000DC57D80.htm) ## 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 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. ## Important distinction This entry adds the with 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. ## Facts - Drawing form: With Current Protection - Public vendor block names: HCB11Q29 / VCB11Q29. Autodesk identifiers, not standards database IDs. - Drawing purpose: protective circuit-breaker form - Graphic scope: Independently authored educational illustration; not certified standard geometry, a terminal pinout or a product footprint. ## Public references - [Circuit-breaker symbol variants](https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-DB1548A3-A4D3-47E5-86AC-37000DC57D80.htm) — Autodesk. Public 1 Pole Circuit Breakers table explicitly lists HCB11Q29 / VCB11Q29 with this operating or connection form. Vendor graphics are linked, not copied. ## Graphic scope Independent original educational concept illustration by Elora Grid. Not a certified standards graphic or manufacturer footprint. Unitless; not to scale. Original artwork licence: https://creativecommons.org/licenses/by/4.0/. Publisher material is linked only.