Intermediate relay: It is used in relay protection and automatic control systems to increase the number and capacity of contacts.
It is used to transmit intermediate signals in control circuits.
The structure and principle of intermediate relays are similar to AC contactors, with the main difference being that the main contacts of contactors can carry large currents, while the contacts of intermediate relays can only carry small currents.
Therefore, it can only be used in control circuits. It generally does not have main contacts because its overload capacity is small.
Therefore, it uses only auxiliary contacts, which are usually more in number. The new national standard defines intermediate relays as “K”, while the old national standard defines them as “KA”.
They are generally powered by DC, with a few using AC power.
Post time: Oct-27-2023