1. Consistent and stable characteristics for accuracy of discrimination. Capacity to break at high and low current. It is inverse time characteristics, as the current is high the time taken to break the circuit is less.
2. Arc quenching is reliable. Chemical action between quartz and arc gas gives high resistance to the arc. Quartz does not produce more gas after observing heat as its sand powder observes more heat of the arc.
3. Non deteriorating since it is sealed. No maintenance, Cheap and indication is available.
Characteristics.
1. I2 t characteristics. This determines the energy that element can pass and to determine the cut off characteristics.
2. Inverse time characteristics, which is useful for selection of the fuse for motor.
Inverse time characteristics
Motor selection characteristics
