What are the significance of short circuit, overload and voltage loss protection functions of main circuit in actual operation?

Short-circuit protection means that when a short circuit occurs somewhere in the circuit, the strong short-circuit current will cause great damage to the equipment and lines in the system. Therefore, the accident point should be removed from the system as soon as possible, which is completed by the short circuit protection device. Short-circuit protection can be divided into quick-break protection and time-limited break protection. The difference between them is that the setting current of quick-break protection is large, the action has no time limit, and the protection range is smaller than the latter. However, the setting action current of time-limited tripping protection is smaller and has a time limit, and the protection range is larger than the former.

Overload protection is to prevent the circuit from overloading. Its setting action current is set according to a certain overload current, which has a long action time limit and prevents the equipment from being damaged due to long-term overload.

Loss of pressure protection means that when the system loses pressure, the switch automatically trips (the switch is automatically turned off), and after the system is called, it is manually turned on.