Intermediate relay is a relay protection and automatic control system, used to increase the number of contacts and capacity, in the control circuit to pass the intermediate signal electrical appliances.
The working principle and role of the intermediate relay example analysis
The relay that turns an input signal into one or more output signals.
It's input signal for the coil of the energized and de-energized, his output signal is the action of the contact, the different action state of the contact will be the signal to a few components or circuits.
The structure and principle of the intermediate relay and AC contactor is basically the same, and the main difference between the contactor and the contactor is that the contactor's main contacts can be passed through the large current, while the intermediate relay contacts can only be passed through the small current, it can only be used for control circuits, which generally do not have a main contact, with all the auxiliary contacts, the number is relatively large.
When choosing an intermediate relay, the main consideration is the voltage level and the number of contacts.
Reference source: The working principle of the intermediate relay and the role of the example analysis