How to know whether a toggle switch is on or off is very common in daily life. Let me take a look at the on and off states of a switch.
Indicator light
The most common way to express the on state of a switch is through an indicator light. The one on the left without an indicator light is off. At the same time, the button is kept in the “0” position. The one on the right is the state where the indicator light is always on, and the button is kept in the “I” position.
I= On
0 = Off
Circuit diagram
To view the working state of the switch through a circuit diagram, the corresponding circuit diagram will be printed on each switch. The circuit diagram on the left is in the on state, and the circuit diagram on the right is in the off state. The same circuit symbol is printed on the terminal position of the corresponding switch
Position relationship
The position of the three-speed toggle switch can indicate the on and off states of the switch. Usually, the middle position is in the off state. The moving contact piece in the toggle switch is in a seesaw balance state and does not contact the terminals on both sides, so the middle position is not powered on and the switch is off. Similarly, the states on both sides are respectively on. Specifically, it depends on the position of the toggle switch lever. If the lever is on the left, the middle terminal is used as the boundary, and the right terminal and the middle terminal are open. Similarly, if the lever is on the right, the middle terminal and the left terminal are connected, and they control the opening and closing of the two switches respectively.
When there are only two symmetrical terminals, it is difficult to identify the opening and closing of the switch from the appearance. Usually, such a toggle switch has its own independent on-off mark. The switch is judged whether it is on or off according to the position of the switch mark and the position of the lever.
