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A diode with a gate lead, latching once triggered.
Also known as: SCR symbol, Silicon controlled rectifier
A thyristor is a diode with a third terminal that turns it on and cannot turn it off: once conducting it latches until the current through it falls away. That one-way control is the fact behind every use of the device, and the symbol shows it as a diode with a gate lead added.
Denotes a silicon controlled rectifier: a diode that begins conducting when its gate is triggered and continues until its main current falls below a holding value.
Contexts: Technical drawing, Electrical equipment
Cannot be turned off by its gate, which is why thyristor circuits are built around the alternating supply crossing zero.
Contexts: Technical drawing, Electrical equipment
A solid triangle pointing at a bar with an extra line leaving the bar or the triangle at an angle.