1. The role of intermediate relays
It plays the role of converting and transmitting control signals, that is to say, its input signal is the energizing and power-off signal of the coil, and the output signal is the contact action of the intermediate relay. Essentially, it is a type of voltage relay that has a large number of contacts (six pairs or more). The current that the contact can withstand is large (the range is 5A-10A in the rated flow), and the action is relatively sensitive (the action time range is less than 0.05s).
2. The role of voltage relay
From the name, it can be roughly understood that its main principle is that it needs to work according to the voltage signal, and determine the action of the contact according to the size of the coil voltage, and the coil needs to be connected in parallel with the load when it is installed and used. The voltage relay can be divided into AC and DC according to the coil voltage, and can be divided into overvoltage and undervoltage according to the operating voltage. Therefore, their functions will also be different, where overvoltage means that when the coil voltage is within the rated range, the armature will not make any suction action, on the contrary, it will perform the action if it exceeds it.
The AC overvoltage relay plays the role of overvoltage protection in the circuit, and the undervoltage is when the coil voltage reaches or exceeds the rated value of the coil, and the armature will be released immediately when the coil voltage is lower than the rated value, so the undervoltage relay mainly plays the role of undervoltage protection in the circuit.
3. The role of the current relay
It usually needs to work according to the current signal, and at the same time, it is also according to the current of the coil to determine the contact action, and the current relay coil needs to form a series connection with the load circuit when installing and using. According to the coil current, it can be divided into AC and DC, and according to the action current, it can be divided into overcurrent and undercurrent.
Because the overcurrent will pass through the coil when the load current is working, the rated current of the coil (that is, the setting current) is usually equal to the maximum load current, and the armature will not act when the load current is not higher than the setting value, on the contrary, if it is exceeded, it will produce a suction action. The main function of the overcurrent relay is to play an overcurrent protection in the circuit, especially in some occasions where the impact overcurrent occurs.
The principle of the undercurrent relay is that when the current in the coil reaches or exceeds the value of the operating current, the armature will perform the suction action, and the armature will be released immediately when the coil current is less than the value of the operating current. When operating in normal condition, if the load current exceeds the coil operating current, the armature will also perform the engagement, and when the load current drops below the coil release current value, the armature will be released. Undercurrent relays play an undercurrent protection role in the circuit.
4. The role of time relay
To put it simply, it is a relay that starts from the input signal (that is, when the coil is energized or de-energized), and the output signal (contact closing or disconnection action) will be delayed after a preset time in advance. Time relays are generally used in relatively low voltage or current circuits, playing the role of turning on and off higher voltage or current, just like providing an electric switching device for automatic control for the circuit.
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