Circular saws have one blade mounted right on the axle of the engine. The voltage amounts to 240 volts and has a not completely ínconsequential weight of 10.4 kg.
From Amazon
Makita 4112HS/2 240V 305mm Electric Disc Cutter
HSS Toolshop
Makita 4112HS 12"/300mm Stone Saw (110V & 240V) - 110V