What is short circuit protection? What is overload protection? What is the difference between short circuit protection and overload protection?

Short-circuit protection and overload protection are of great use in daily life. Whether it is used in household appliances, anti-resistance originals, or mobile terminals, how does short-circuit protection and overload protection protect circuit safety? 

Short-circuit protection is a failure in the circuit. For example, the resistance of the wire is almost negligible without passing through the load. Therefore, the extremely large current generated instantaneously provides a power cut to prevent equipment damage and accidents.

Short-circuit protection means that the Power Supply can be cut off quickly and reliably after a short-circuit fault occurs in the electrical circuit to prevent the electrical equipment from being damaged by the impact of the short-circuit current. Under normal circumstances, the short-circuit protection device should be installed closer to the power supply terminal, which is usually installed under the power switch. This can not only expand the range of short-circuit protection, but also can isolate the electrical circuit from the power supply, making it easier to install. And repair. For some devices with short-circuit protection requirements, the short-circuit protection device should be installed close to the protected device.

The short circuit protection of the circuit breaker refers to a kind of protection in which the currents such as phase, phase zero and phase ground increase in vain. Leakage protection does not work for non-grounded shorts.

Overload is the overload, which exceeds the rated load of the equipment itself. The phenomenon is that the current is too large, the electrical equipment is heated, the long-term overload of the line will reduce the insulation level of the line, or even burn out the equipment or line; in general, it exceeds the equipment. The rated load capacity is overload. If the motor is blocked, the crane will not move.

Overload protection is actually overcurrent protection: as the name suggests, the current is too large, the reasons are many, such as overload of electrical equipment (such as the above), short circuit (including short circuit), equipment insulation damage and so on.

Exceeding the rated current value defined by the circuit design is overcurrent, such as thermal relay action, overcurrent relay protection action, circuit breaker trip, etc.

Before we also said the so-called overload protection, that is, overcurrent protection, the so-called overcurrent, that is, the current flowing through electrical equipment and lines, not only exceeds its rated current value, but also exceeds the time it is allowed to withstand.

Overcurrent allows for both overcurrent and fault overcurrent. When the squirrel cage motor starts, its starting current is much larger than the rated current, but it does not exceed the allowable time, so it is allowed to overcurrent.

Overload protection is for fault overcurrent. Short circuit is also an overload and is a serious overload phenomenon. It can cause great damage to electrical equipment and circuits, and even cause fires.

Overload protection generally uses an inverse time overcurrent protection device, that is, the greater the current flowing through the protection device, the shorter the time limit of the action. The fuse also has a certain inverse time characteristic. There are also bimetal thermal relays.

Short-circuit protection generally uses momentary action, that is, 0 second action. There are electromagnetic, electronic and other forms.

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