XML7B MCB Circuit Breaker Bimetallic System
An MCB operates as an automatic switch that opens in the event of excessive current flowing through the circuit and once the circuit returns to normal, it can be reclosed without any manual replacement.
Under normal working conditions, MCB operates as a switch (manual one) to make the circuit ON or OFF. Under overload or short circuit condition, it automatically operates or trips so that current interruption takes place in the load circuit.
The visual indication of this trip can be observed by automatic movement of the operating knob to OFF position. This automatic operation MCB can be obtained in two ways as we have seen in MCB construction; those are magnetic tripping and thermal tripping.
Under overload conditions, the current through the bimetal causes it to raise the temperature of it. The heat generated within the bimetal itself is enough to cause deflection due to thermal expansion of metals. This deflection further releases the trip latch and hence contacts get separated.
XML7B MCB Circuit Breaker Thermal Tripping Mechanism consists of bimetall strip, soft connection, arc runner, braid wire, moving contact and moving contact holder.
The thermal tripping arrangement consists of a bimetallic strip around which a heater coil is wound to create heat depending on the flow of current.
The heater design can be either direct where current is passed through a bimetal strip which affects part of electric circuit or indirect where a coil of current carrying conductor is wound around the bimetallic strip. The deflection of a bimetallic strip activates the tripping mechanism in case of certain overload conditions.
The bimetal strips are made up of two different metals, usually brass and steel. These metals are riveted and welded along their length. These are so designed such that they will not heat the strip to the tripping point for normal currents, but if the current is increased beyond rated value, the strip is warmed, bent and trips the latch. Bimetallic strips are chosen to provide particular time delays under certain overloads.
1.Q: Are you trading company or manufacturer ?
A: We are manufacturer and specializing in circuit breaker parts and components.
2.Q: How long is your delivery time?
A: Normally 5-10 days if there are goods in stock. Or it will take 15-20 days. For customized items, the delivery time depends.
3.Q: What is your terms of payment ?
A: 30% T/T in advance ,and the balance before shipment.
4.Q : Can you make customized products or packing?
A: Yes.We can offer customized products and packing ways can be made according to customer’s requirement.