Automatic Transfer Switch Symbol. Fused disconnect switch the symbol is a combination of a fuse and disconnect switch with the switch in the open position. Look carefully at the next grouping of symbols.

The symbol is frequently shown in conjuction with a transfer switch. Transfer switches with multiple ratings provide greater application flexibility. Inverter switch before closing.
Both circuit breakers are normally closed.
Inverter switch before opening. Both circuit breakers are normally closed. Double closing contact. 800 x 600 px source.