MCB triping

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jeet2907

Dear all

Can anybody explain hoe the MCB work during trip or say their is any bimetalic strip like OLR. Hence ar the time of SC or OL its giving a trip????

Waiting for your valuable response???

jeet2907

Dear all

Can anybody explain hoe the MCB work during trip or say their is any bimetalic strip like OLR. Hence ar the time of SC or OL its giving a trip????

jeet2907

Dear all

Can anybody explain hoe the MCB work during trip or say their is any bimetalic strip like OLR. Hence ar the time of SC or OL its giving a trip????

hi

yes there are bimetallic strip are present in MCB as per its Rating which in turn trip the MCB in case of O/L and Short ckt (in both the case high current flow through the mcb) as a result bimetallic temp.rises

and trip the MCB.

regards

aakash

jeet2907

Dear all

Can anybody explain hoe the MCB work during trip or say their is any bimetalic strip like OLR. Hence ar the time of SC or OL its giving a trip????

Valli

jeet2907

Dear all

Can anybody explain hoe the MCB work during trip or say their is any bimetalic strip like OLR. Hence ar the time of SC or OL its giving a trip????

Well the basic principle is same i.e. Heating and bending of copper strip to provide protection.

But in OLR the strip is having less impedence then that of MCBs and hence MCBs trips on higher currents i.e.3 to 5 times inB curve and 5 to 8 times in C curve and provides s/c protection.

Every current carrying conductor behaves like a magnet.

Hence, Copper conductor inside MCB or OLR becomes magnet and hence a magnetic field gets created. Direction of current defines the orientation of magnetic feild.

Thermal-magnetic circuit breakers combine the benefits of a thermal and magnetic circuit breaker: a delay that avoids nuisance tripping caused by normal inrush current, and fast response at high currents.

High overcurrents cause the solenoid to trigger the release mechanism rapidly, while the thermal mechanism responds to prolonged low value overloads.

They have a characteristic two-step trip profile that provides fast short-circuit protection of expensive electrical systems while minimizing the risk of disrupted system operation.