High Current PCB Shunts and Jumpers 30 amps to 115 amps. For high current PCB applications it is necessary to move current to a location where the foil weight or trace width may not be adequate. IHI High Current Shunts and Jumpers are stock items. Hot spots can be alleviated by using an IHI shunt as a current path: a heat sink and a interlayer bus carry current through the PCB. Also useful for current sensing loop primary.