Circular saws have one blade mounted right on the axle of the engine. It has a voltage of 240 volts and has a somewhat modest weight of 4.8 kg.
From Amazon
Makita 5008MG 240V 8-inch/ 210mm Circular Saw
B&Q
Makita 1800W 240V 210mm Corded Circular Saw 5008Mg/2 - One Size