Views: 22 Author: Site Editor Publish Time: 2023-01-09 Origin: Site
What the residual current circuit breaker detects is the residual current, that is, the algebraic sum of the instantaneous valuesof the phase and neutral currents in the protected circuit (including the three-phase unbalanced current and harmonic current in the neutral). For this reason, the setting value of the RCD, that is, its rated operating current IΔn, only needs to avoid the normal leakage current value, which is measured in mA, so the RCD can cut off the ground fault of the protection circuit very sensitively, and can also be used as a Backup protection against direct contact electric shock.
What is the difference between residual current circuit breaker and general circuit breaker?
What are the structural characteristics of residual current circuit breaker?
What is the wiring method of residual current circuit breaker?
What does residual current circuit breaker do?
residual current circuit breakers have leakage protection functions, and some also have short-circuit protection and overload protection functions;
The circuit breaker has overload protection and short circuit protection functions, but no leakage protection function.
The biggest difference is that the former can play the role of leakage protection, while the latter cannot.
It is very dangerous when the equipment used is leaking, so a residual current circuit breaker is required.
There is a leakage current adjustment knob on the circuit breaker, which can be adjusted. If not, it means that the leakage current of this leakage circuit breaker is not adjustable.
The structure of residual current circuit breaker, this series of residual current operated circuit breakers are current operated electronic residual current operated circuit breakers. .
All components of the residual current circuit breaker are housed in a plastic housing.
The classification of residual current circuit breaker is divided into four-wire residual current circuit breaker and three-phase four-wire residual current circuit breaker according to the number of stages.
According to the residual current breaking time, there are general type and delay type.
According to the residual operating current, the residual operating current is non-adjustable and the residual operating current is adjustable (three-stage adjustable)
The four lines on the pole are 380 volts, and the two incoming lines are 220 volts, that is, any one of the three live lines on the pole and a neutral line are 220 volts. The circuit breaker should have two poles. If there are only three poles, you can choose two poles. You can choose two of the three terminals in the upper row to connect to the incoming line, and then select the two terminals corresponding to the lower row and the upper row to connect to the room line.
What does residual current circuit breaker do?
1. When the person gets an electric shock or the grid leakage current exceeds the specified value, the residual current circuit breaker can quickly cut off the faulty power supply in a very short time to protect the safety of the person and the electrical equipment.
2. The residual current circuit breaker has overload and short circuit protection functions, which can be used to protect the overload and short circuit of the line or motor, and can also be used for infrequent switching of the line under normal conditions.
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