A time relay is a relay that starts from receiving an input signal (energization or de-energization of the coil), and outputs a signal (contact closing or opening) after a preset delay. According to the different delay modes, it can be divided into power-on delay relay and power-off delay relay.
After the power-on delay relay accepts the input signal, the output signal changes after a certain delay. When the input signal disappears, the output signal resets instantly.
After the power-off delay relay receives the input signal, it generates an output signal instantaneously. When the input signal disappears, the output signal is reset after a certain delay.
Time relay symbol1. The graphical symbol of the coil of the time relay
Figure 1 is the graphical symbol of the power-on delay coil, and Figure 2 is the graphical symbol of the power-off delay coil.
2. Graphical symbols for the contact of the time relay
The contact graphic symbol of the time relay is mainly the direction of the opening of the semicircle symbol of the contact, and the principle is that: the direction of the semicircle opening is the direction of the contact delay action.
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