Relay in self-sustaining

The self-sustaining of relays can be found everywhere, where the switching impulse takes place only for a short time, but the controlled circuits should be keeped active after this trigger. We have already used the ip-op circuit. By use of the self sustaining circuit, its possible switch on a permanently running motor by a single push button press. For example in a milling machine. Another button is pressed for turning off. The worker does not need to push the button the whole time, which is really difcult. Here is a basic circuit of latching the relay-brick. If the button is pressed, the relay remains activated, even if activated the control LED remains on. Only the separation of the supply voltage resets the circuit. We will improve this in the next experiment.