Gw instek psw30 72 720w programmable switching dc power supply gw instek psw30 72 p the gw instek psw30 72 is a single output multi range programmable switching dc power supply covering a power range up to 720w the multi range feature allows the flexible and efficient configuration of voltage and current within the rated power range as the gw instek psw30 72 can be connected in series for maximum 2 units or in parallel for maximum 3 units the capability of connecting multiple psw units fo