I need help in using a power mosfet to switch on and off 140 VDC. The current is approximately 25 amps. The power will be on for one second at a time, then off for twenty seconds. I have an old part number IRF
243, but it is no longer available. A mosfet in that class, 16 amp 150 volt 125 watt or higher would work. I need to know how to operate this mosfet including how many volts to turn it on and the placement of any resistors or other components to make it operate as a relay.