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A plain rectangle in the control circuit, with a reference letter.
Also known as: Relay coil, Operating coil, Contactor coil, Rectangle in a control circuit
A relay's coil and its contacts are drawn in different places on a schematic — the coil in the control circuit, the contacts wherever they switch — and a shared reference letter is the only thing linking them. Following that letter is how a ladder diagram is actually read.
Denotes the operating coil of a relay or contactor, drawn in the control circuit.
Contexts: Electrical equipment
Is linked to its contacts, drawn elsewhere on the diagram, only by a shared reference designation.
Contexts: Electrical equipment
Is drawn as a plain rectangle in IEC 60617 and as a coil of loops in the older and North American schemes.
Contexts: Electrical equipment
A plain rectangle with a connecting line at each end, bearing a letter and number reference designation.