CB
Circuit breaker
A switching device that can interrupt a circuit, with specified fault-interruption capability.
SLD / Schematic
Functional block · VBR
Vacuum-interrupter breaker reference
Functional block · Switchgear
An independently authored application reference. The drawing shows the named function or circuit relationship; use the project legend and selected equipment documentation for its drafting form and connections.
Browse this installation focusIn plain English
What this block does
Identifies a circuit-breaker application in which interruption takes place within vacuum interrupters.
A simple example
In a medium-voltage switchgear drawing, the operating reference helps the reader distinguish the interrupting device from its isolation, earthing and auxiliary-control interfaces. For this reference, the drawing identifies “Power path and operating mechanism” at the input and “Interrupted circuit path” at the output. The generic breaker mark does not specify vacuum ratings.
What the drawings help you do
Start at the named input: Power path and operating mechanism. Identify its source device or document and the state represented on the drawing. Follow the named output: Interrupted circuit path. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- Input
- Power path and operating mechanism
- Output
- Interrupted circuit path
- Application reference
- An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections.
Read the source: High-voltage circuit breakers
Schematic · VBR
What it represents
Identifies a circuit-breaker application in which interruption takes place within vacuum interrupters. A switching-device operating reference adds the specific mechanism or duty context needed to interpret its place in a power circuit. The same basic switching outline can serve different equipment constructions, so the added description must remain attached to its device tag.
In a medium-voltage switchgear drawing, the operating reference helps the reader distinguish the interrupting device from its isolation, earthing and auxiliary-control interfaces. For this reference, the drawing identifies “Power path and operating mechanism” at the input and “Interrupted circuit path” at the output. The generic breaker mark does not specify vacuum ratings.
Use the device schedule for its actual construction, operating duty and ratings. These original functional illustrations describe the named role and do not certify a standard glyph or product footprint. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation.
How to read it
- Start at the named input: Power path and operating mechanism. Identify its source device or document and the state represented on the drawing.
- Follow the named output: Interrupted circuit path. Cross-reference its destination and separate the command from confirmation that the equipment responded.
- The generic breaker mark does not specify vacuum ratings.
- Use the device schedule for its actual construction, operating duty and ratings. These original functional illustrations describe the named role and do not certify a standard glyph or product footprint.
Information to show or reference
- Label the source and connection reference for power path and operating mechanism.
- Identify the destination and defined state of interrupted circuit path.
- Record the equipment or control-document revision supporting this functional block.
- Check this application limit in the project design: The generic breaker mark does not specify vacuum ratings.
A distinction that matters
The generic breaker mark does not specify vacuum ratings. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
High-voltage circuit breakers
Public technical context for switching-device operating references. Circuit-breaker construction and interruption families. The application text and educational graphic are independently authored; the publisher does not certify this representation.
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. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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