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A coil beside a switch, showing a circuit that a second circuit operates.
Also known as: Contactor symbol, Coil and switch
A relay symbol shows a coil and a switch drawn apart but linked by a dashed line. The separation is the point: the two circuits are electrically isolated and connected only by a magnetic field.
Represents a switch operated by an electromagnet, so that one circuit controls another without a direct electrical connection.
Contexts: Technical drawing, Electrical equipment
Draws the coil and the contacts separately, joined by a dashed line, because the two are often in different parts of a schematic and are genuinely isolated from each other.
Contexts: Technical drawing, Electrical equipment
A rectangle or coil representing the electromagnet, with a separate switch drawn nearby and a dashed line connecting the two to show the mechanical link.
A relay is a switch with an actuator drawn alongside.