The relay of the intermediate relay is different from the normally open normally closed contact

The relay of the intermediate relay is different from the normally open normally closed contact

1, the middle relay coil contact is used to control the relay on and off, normally closed, normally open contact is to control other electrical components. Intermediate relay, as the name implies, is the role of its intermediate control. For example: PLC output connected to the middle relay (coil contact), and often open contact with the contactor coil, contactor normally open contact with the motor; when the PLC has output, the middle relay coil power, the middle relay suction Together, its normally open contact closure, contactor coil power, contactor normally open contact power supply, to the motor power. 2, intermediate relay (intermediate relay): for relay protection and automatic control system to increase the number and capacity of contacts. It is used to pass the intermediate signal in the control circuit. The structure and principle of the intermediate relay are basically the same as those of the AC contactor. The main difference from the contactor is that the main contact of the contactor can pass through the high current and the contact of the intermediate relay can only pass through the small current. Therefore, it can only be used in the control circuit. It is generally no main contact, because the overload capacity is relatively small. So it is all with auxiliary contacts, the number of more. The new national standard for the definition of intermediate relay is K, the old national standard is KA. Usually DC power supply. A few use AC power. 3, in the case of normal (no power) in the open state of the contact is called normally open contact. In the case of normal (no power, no current flow) in the case of closed state of the contact is called normally closed contact.

The relay has three or four pairs or pairs of terminals, only one pair is connected to the electrical coil, the other is normally closed or normally open contact.

The relay of the intermediate relay is used to control the relay on and off, normally closed, normally open contact is to control other electrical components. Intermediate relay, as the name implies, is the role of its intermediate control. For example: PLC output connected to the middle relay (coil contact), and often open contact with the contactor coil, contactor normally open contact with the motor; when the PLC has output, the middle relay coil power, the middle relay suction Together, its normally open contact closure, contactor coil power, contactor normally open contact power supply, to the motor power.