In the power system, circuit breakers, contactors, and relays seem to be familiar guys, but many of them are half-knowledgeable, but they still don't know the difference between these things and the connections. Today we will talk about them together.
Let’s say the same first!
Of course, it’s unquestionable that these guys are all kinds of switching appliances. What is a switch is easier to understand. All the things that can complete the opening and closing actions are switches. Therefore, these things are all switch.
Therefore, these so-called differences are just different types of switches.
In this way, is it easy for everyone to understand?
One, circuit breaker
Its definition is very simple: it refers to a switching device that can close, carry and break the current under normal loop conditions and can close, carry and break the current under abnormal loop conditions within a specified time.
2. Contactor
Contactor refers to an electrical appliance that uses a coil to flow current to generate a magnetic field and close the contact to control the load.
3. Relay
A relay is an electrical control device. It is an electrical appliance that causes the controlled quantity to undergo a predetermined step change in the electrical output circuit when the change in the input quantity (excitation quantity) meets the specified requirements.
From the above block, perhaps you already know very well that circuit breakers and relays are used in electrical primary circuits and can make and break large currents, while relays are used in electrical secondary circuits with very small contacts. Turn on and off small currents.
