MCB (Miniature Circuit Breaker) or Miniature Circuit Breaker is an electromechanical device that functions as a protector of electrical circuits from excessive current. In other words, the MCB can automatically disconnect the electric current when the electric current passing through the MCB exceeds the specified value.
However, when the current is in normal condition, the MCB can function as a switch that can connect or disconnect electric current manually.
The MCB basically has a function similar to FUSE, which is to disconnect the flow of electric current when there is an overcurrent disturbance. The occurrence of excess electric current can be due to a short circuit (Short Circuit) or the presence of more loads (Overload). But the MCB can be turned ON again when the electrical circuit is normal, while the Fuse / Fuse that is disconnected due to the excess current interference cannot be used again
The working principle of MCB (Miniature Circuit Breaker)
Under normal conditions, the MCB functions as a manual switch that can connect (ON) and disconnect (OFF) the electric current. In the event of an Overload or Short Circuit (Short Circuit), the MCB will operate automatically by deciding the electric current that passes through it. Visually, we can see the knob movement or button from the ON condition to OFF. This automatic operation is carried out in two ways, as shown in the picture below, namely by Magnetic Tripping and Thermal Tripping. Thermal Tripping (Termination of the connection of electric current with High Temperature) When the Overload condition, the current flowing through the Bimetal causes the Bimetal temperature itself to be high. The hot temperature causes the Bimetal to curve so that it breaks the MCB (Trip) contact.
Application:
To protect cables and equipment from being overloaded and shorted.
2. General rules for choosing an MCB. Network technical data at the point of consideration Earthing system, short circuit current at the installation point of the circuit breaker, which must always be less than this device's breaking capacity, normal network voltage. There are
3 characteristics of the curve for magnetic operation: B curve (3-5In) protects and controls the circuit against long cables in TN and IT systems. Curve C (5-10In) protection and control circuit against overload and short circuit; protection for resistive and inductive loads with low inflows. D curve (10-14In) protection and control circuit against overload and short circuit; protection for circuits that supply loads with high surge currents at the closing of the circuit (LV / LV transformer, faulty light).
Watch Video For More Information
CLICK HERE TO WATCH VIDEO
Watch Video For More Information
CLICK HERE TO WATCH VIDEO
0 Comments