Advantages
1. Auto reclosing shutters.
2. Proven wiping contacts.
3. Sturdy rugged mechanism.
4. Reliable aux. Switches contacts.
5. 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.