SLDResources / SLD symbolsUpdated 29 Oct 2026

Capacitor, reactor and drive symbols

Capacitor banks and reactors correct power factor and limit current. Drives, rectifiers, inverters and UPS units convert power between AC and DC or between frequencies.

SymbolANSI / IEEEIEC 60617What it is

Capacitor bankS00567A capacitor bank supplies reactive power to correct the power factor and support voltage.

ReactorS00848A reactor is an inductor in the power circuit.

Variable frequency driveS00213A variable frequency drive feeds a motor at a variable frequency and voltage, so its speed can be controlled.

RectifierS00894A rectifier converts AC to DC, for example to charge a battery or supply a DC bus.

InverterS00896An inverter converts DC to AC, for example from a battery or solar panels.

UPSAn uninterruptible power supply keeps critical loads running from a battery when the normal supply fails.

LoadAn arrow at the end of a feeder stands for a load that is not drawn in detail, such as a distribution board.

Loads and power electronics: ANSI and IEC

IEC draws power converters as a square with a diagonal (S00213), with AC or DC marks on each side: AC in and DC out is a rectifier (S00894), DC in and AC out an inverter (S00896), AC on both sides a frequency converter. US one-lines usually draw a labelled box: VFD, RECT, INV or UPS.

Capacitors differ in one detail: IEC draws two straight plates (S00567), ANSI one straight and one curved.

Frequently asked questions

Which loads and power electronics appear on a single line diagram?

This legend covers capacitor bank, reactor, variable frequency drive, rectifier, inverter, UPS, load. Project legends may add more.

Are these symbols different in IEC and ANSI?

5 of the 7 are drawn differently. Each symbol page shows both forms side by side.

Can I download these symbols?

Yes. Each symbol page has free SVG files, and the hub has printable PDF charts.

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Loads and power electronics: ANSI and IEC

Frequently asked questions

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