As others has stated, it is 620 watts of power. I own one and it is just an awesome piece of equipment. I've run it for several hrs at a time on my layout. The fan is very quiet as well and only comes on as needed. So when you first power it up, the fan is off. I've run dual gg1s (pulmor motors) with a string of heavy weight passenger cars on one channel (draws near 7 -8 amps) and the other channels still have plenty of power for my other blocks and switches.
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