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Free AutoCAD single-line diagram symbols (DWG) for power plants, substations and distribution

Power system single-line symbols (IEC 60617): 139 ready-made AutoCAD blocks (DWG), free to download and use in your own projects, as a ZIP or one symbol at a time.

139 power system symbols as ready-to-use AutoCAD blocks for single-line diagrams: two- and three-winding transformers with delta, star, open delta and neutral earthing marks and on-load tap changers, circuit breakers in the IEC and box forms, disconnectors, earthing switches, fuses, busbars, overhead lines, cables, gas-insulated parts and towers, generators, wind and storage units, inverters, batteries, motors and loads. Each block carries a tag, the main rating and invisible equipment list attributes.

Free library: version 1.2, updated November 9, 2026 · Pro library: version 1.0, updated November 9, 2026 · Check out what's changed

IEC 60617 Power System Pro: 168 more symbols

Beyond the 139 free symbols above, Pro adds five more sections of the standard as AutoCAD blocks: qualifying symbols, fundamental items, transmission path, terminals and connectors, and semiconductor devices. One licence covers every section, and the free library stays free.

Two ways to get Pro

Pro library

$49

  • DWG files with all 168 Pro symbols, one ZIP per section
  • Plain DWG files, no add-in needed
  • Includes the 139 symbols of the free library as a DWG

Pro palette for AutoCAD

$59

  • Everything in the library: the DWG files of every Pro section are included
  • A palette inside AutoCAD: search by name in 9 languages and place a symbol with one click
  • All 307 symbols; 12 of them work for free, so you can try before you buy
  • AutoCAD 2021 to 2027 on Windows
See the palette

What's inside this Pro library

SectionSymbolsWhat it coversFile in your download
Power system single-line Pro symbols168Instrument transformers, Reactors, capacitors and arresters, Protection relays, Meters and control, Switchgear bays, Low voltage distribution, Reactive compensation and filters, Generator excitation and auxiliaries, Machine protection relays, System and auxiliary relaysPower-System-Single-Line-Pro-Symbols.zip
Total168
  • Every symbol is an AutoCAD block, drawn in millimetres at 1:1 and named IEEE_GROUP_NAME; insert it at scale 1.
  • Each block has two invisible attributes, DESC (the symbol name) and REMARKS (free text). All geometry is on layer SYMBOL.
  • Each DWG has a CATALOG layout with all its symbols on one sheet, ready to plot to PDF, and a README.txt lists every block.
  • Plain DWG files in AutoCAD 2018 format, plus a second ZIP per section in AutoCAD 2010 format. No add-in is needed.
  • The 139 symbols of the free library come in the same download as their own DWG, so you have the whole set in one place.

Pro library licence

$49

For one person

Education: $24.50

  • Pay once
  • Includes the free IEEE 315 library

Student or teacher?

Half price ($24.50) for one year with your school e-mail address. Buy again next year to renew.

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What you get

  • All 168 symbols of the sections on this page, as AutoCAD blocks in DWG files
  • The free IEEE 315 library with its 79 symbols, in the same download
  • Every section as a ZIP in AutoCAD 2018 format and in AutoCAD 2010 format
  • Sections added later come with the same purchase
  • The free IEEE 315 library stays free and unchanged.
  • A perpetual licence: pay once, keep the files.

Read the full licence

Refund policy

  • Free · 139 symbols

  • Power system single-line Pro symbols · 168

Power system single-line Pro symbols 168

168 further symbols of this library for Pro, in the same blocks, layers and attributes as the free ones.

168 of 168 symbols

IEC 60617 has several parts. The other libraries of the standard:

Sample drawings made with this library

Related symbol libraries

Missing a symbol? Tell us which one.

Attributes for parts lists

Every block has a visible tag next to the symbol (for example T1, QF1) and a second visible attribute with the main rating, such as the rated power of a transformer. The data of your equipment list are invisible attributes: VOLTAGE_RATIO, VECTOR_GROUP, IMPEDANCE_PCT and TAP_RANGE for transformers; RATED_KV, RATED_CURRENT_A and BREAKING_KA for breakers and switches.

How to use the library

  1. Unzip the file and open the DWG. Copy the symbols you need into your plan, or drag the blocks in from DesignCenter (ADCENTER).
  2. The symbols are drawn at the plotted size in millimetres. Vertical symbols have the connection point at the top, which is the insertion point, and the other connection at the bottom, on a 5 mm grid, so symbols stack into a feeder; busbars, lines, relays and meters are horizontal and centred on the insertion point.
  3. Transformers show their winding connections (delta, star, open delta, neutral earthed) and an optional on-load tap changer. Circuit breakers come in the IEC form with the cross and as a box, open and closed; the disconnectors, earthing switches, fuses and load break switches follow the same style, and withdrawable devices use the plug-and-socket contact of IEC 60617.
  4. The busbar blocks are horizontal and centred on the insertion point; draw longer busbars as thick polylines of the same width. Build your own feeders by stacking the single symbols on the 5 mm grid.

About the conventions

Single-line symbols differ between IEC and IEEE practice and between utilities. The breaker, transformer and switch symbols here follow IEC 60617 and IEEE 315 single-line practice.

The blocks are our own drawings, not copies of a standard, and the library is not certified. Check the symbols against the legend of your utility or customer, and change a block if yours differs.

What changed in each version

Version 1.2 · November 9, 2026

Removed: 168

Version 1.1 · November 5, 2026

Version 1.1 adds 129 symbols: more transformer connections and on-load tap changers, more instrument transformers, reactive power compensation and harmonic filters, withdrawable devices and earthing switch combinations, double busbar, one-and-a-half breaker, GIS and medium voltage panel bays, wind, storage and generator excitation units, 31 more protection relay device numbers, recorders and control devices, more lines, cables and enclosures, and more loads. The variable frequency drive now shows the AC to AC converter form.

New symbols (129)

Transformer, star-delta · Transformer, star-delta, neutral earthed · Transformer, star-star, both neutrals earthed · Transformer, three winding, delta tertiary · Transformer, delta-star, on-load tap changer · Transformer, star-delta, on-load tap changer · Transformer, three winding, on-load tap changer · Autotransformer, on-load tap changer · Disconnector with earthing switch · Disconnector with two earthing switches · Disconnector, three pole · Earthing switch, three pole · Load break switch, three pole · Load break switch with earthing switch · Load break switch with fuse · Contactor with fuse · Circuit breaker with earthing switch · Fuse cutout (drop-out) · Fuse, three pole · Current limiter (power cable) · Circuit breaker, withdrawable · Contactor, withdrawable · Overhead line (IEC mark) · Underground line · Submarine line · Cable manhole (chamber) · Gas-insulated enclosure · Gas-insulated busbar · Cable separable connector · Link box (sheath bonding) · Optical ground wire (OPGW) · Isolated phase busduct · Overhead line with ground wire · Wind generator, doubly fed (DFIG) · Wind generator, full converter · Gas engine generator set · Pumped storage motor-generator · Flywheel energy storage · Supercapacitor energy storage · Combined heat and power set · 89 more

Frequently asked questions

Are the symbols IEC or IEEE style?
Both appear. Circuit breakers are given in the IEC form with the cross and in a box form. Use the form your utility or customer expects and delete the others from the drawing.
Can I draw a complete substation single-line diagram with this library?
Yes, for the main circuit. Combine transformers, breakers, disconnectors, lines, cables and sources, and draw the busbars as thick polylines of the same width as the busbar block. Instrument transformers, arresters, protection relays, meters and ready-made switchgear bays are not in the free library.
Can I use the symbols in commercial projects?
Yes. They are free to use and modify in your own projects, including commercial ones. They are provided as is, without warranty. Please do not redistribute or resell the library; see the library terms.
Where are the motor control and PLC symbols?
Contacts, coils, pushbuttons and relays for control circuits are in the IEC 60617 and ANSI/IEEE 315 electrical symbol libraries, and the I/O symbols are in the PLC ladder library. This library covers the power circuit.
Can I change a symbol or add attributes?
Yes. Open the DWG, edit a block with BEDIT to change it or add attributes, and save. To update drawings that already contain the block, run ATTSYNC or replace the block. Make a backup first: attribute values can be lost if ATTSYNC is used carelessly.
Where do I find a ready-made set of these symbols for AutoCAD?
AutoCAD itself ships only a small set of sample blocks, so a full symbol set has to come from a library. Download the ZIP on this page and open the DWG: every symbol is a block. Insert one with INSERT (Blocks palette, Libraries tab, then pick the DWG) or drag it from DesignCenter (ADCENTER). You can also download a single symbol on its own.