Self-holding circuit
A self-holding circuit is the basis of all circuit design, and is generally used to control the starting and stopping of the motor. Three circuit loops types, namely: control, warning, and alarm, most often use a self-holding circuit design.
In some circumstances, when the relay is triggered in fast fluctuation, the motor will be turned on and off in quick succession. The state of the circuit in this situation, however, can be retained by self-holding circuits which bypass signals arriving from an external relay by the contact of the relay itself. Thus, allowing them to operate even when the circuit is cut, and enables a control range to be set.
References
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