Advantages
Auto reclosing shutters.
Proven wiping contacts.
Sturdy rugged mechanism.
Reliable aux. Switches contacts.
Slow closing facility independent of closing spring.
Disadvantages
Bulky, more space, spring charge motor 5A. , Spring charging time 14 sec 4 sec at timing, trip extends in test position also. No neutral bus bar link, we cannot finger contact resistance since fixed on bus side.
