WEG ABWC Serie Instrucciones De Instalación, Operación Y Mantenimiento página 18

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There are the following overcurrent interruption principles.
1. Instantaneous trip
With a short circuit current, the ABW Compact trips instantly to minimize the side effect due to the accident
on the load side. It is called instantaneous trip.
2. Interruption with time delay
When an abnormal current flows, such as transformer or capacitor starting current and motor starting
current, the ABW Compact maintains the conduction condition for a regular time and interrupts the current
if it remains continuously. In the event of a short circuit, the ABW Compact minimizes the damage caused
by the accident by keeping the circuit for the time previously set in relation to the operating time of the circuit
breakers upstream under selective discrimination.
However, it interrupts the circuit after the delay time if the abnormal current flows continuously due to an
interruption fault of the circuit breakers downstream. It is called interruption with time delay.
3. Overload trip
If the current exceeding the rated current flows continuously, the cable gets hotter and causes a great fire.
Therefore, the ABW Compact stops the current before the cable temperature reaches dangerous levels. It is
called overload trip.
4. Ground fault trip
Ground fault defines how the current flows to the ground from the circuit or load due to a fault. If the ground
fault current flows, it is inserted into other nearby cables due to electronic induction, the voltage level will
increase and eventually cause serious effects or damages to other devices.
Also, hand touches could result in electric shock. The ground fault tripping prevents any possible ground
fault accident.
18 | ABWC Compact Air Circuit Breaker