All of our PM60 chucks electro-permanent. This means the chuck only uses power in the magnetise and demagneise cycles (approximately one second). This means that even in the event of total power failure to your machine or building the chuck will remain on and at full power indefinitely.
Additionally because no power is consumed in the machining cycle the chuck is a cold chuck and does not generate and heat making it the most stable and accurate chuck on the market. Electro-permanent systems also save you money on your electricity consumption making it the greener option today.