Reactor symbol
Also called Inductor, Current limiting reactor, Shunt reactor
A reactor is an inductor in the power circuit. In series it limits fault current; connected to earth it absorbs reactive power.
What the reactor symbol means
A reactor is an inductor in the power circuit. In series it limits fault current; connected to earth it absorbs reactive power.
ANSI and IEC symbols
Where you see it
Current limiting on bus ties and feeders, shunt reactors on long cables, harmonic filters.
What is written next to it
On a one-line, the reactor carries its tag and its ratings: impedance or inductance, rated current and short-circuit current.
What gets checked at commissioning
Before the reactor is energised, the test records usually cover: impedance, winding resistance and insulation resistance. Each check is recorded against the tag, so the system can be handed over with its evidence. See commissioning software.
Related symbols
Frequently asked questions
What does the reactor symbol look like?
On ANSI drawings: A coil drawn as a row of loops. In IEC 60617: A three-quarter circle on the conductor. The loop form, like the US one, is S00849.
Is the reactor symbol the same in IEC and ANSI?
No. A three-quarter circle on the conductor. The loop form, like the US one, is S00849. The IEC 60617 number is S00848.
Where is a reactor used?
Current limiting on bus ties and feeders, shunt reactors on long cables, harmonic filters.
- In production since 2014
- Thousands of daily users
- On MODEC FPSO projects since 2016