A: The st electrical symbol stands for push button switch. Button switch, also known as the control button (referred to as the button), is a manual and generally can automatically reset low-voltage electrical appliances. Buttons are usually used to issue start or stop instructions in the circuit to control the turn-on and turn-off of electromagnetic starters, contactors, relays and other electrical coil currents.
Push-button switch is a kind of pressing action, release and reset use.