UVT COIL

UVT coil (Under Voltage Trip)

UVT coil is normally close point. When de-energized the coil MCCB will be trip. UVT coil is used to detect the phase.

SHUNT COIL

Shunt coil and UVT (Under Voltage Tripping) coil of the MCCB)

How to connect the shunt coil or UVT coil to the MCCB

First trip the MCCB by using manual test button and after connect the UVT or shunt coil to the MCCB.

v Shunt coil

Shunt coil is normally open contact point. When energized the coil the MCCB will be trip.

Protection of the MCB / MCCB

Protection of the MCB / MCCB

MCB	MCCB
1. Short circuit	1.Short circuit
2. Over load	2. Over load
	3. Other protection

Chart 03.04.01

MCB / MCCB has two mechanism to trip

1). Bimetallic part

2). Electromagnetic part

Thermal tripping

This action provides bimetallic part. It is used to protect the circuit from over load.

Electromagnetic tripping

This action provides electromagnetic field. It is used to protect the system from short circuit.