A switched diverter circuit adapted to minimize heating of an implanted lead, the switched diverter circuit being disposed inside the housing of an active implantable medical device (AIMD), the switched diverter circuit comprising: a) at least one switch (266 1) having a pole that is electrically connectable to an implantable lead (104, 106) including an electrode (108, 110) configured for tissue-stimulating or biological-sensing; b) an energy dissipating surface provided by the device housing; c) a first switch throw that is electrically connected to tissue-stimulating or biological-sensing circuits for the AIMD; d) at least one frequency dependent energy diverting impedance element or a short circuit, wherein the frequency dependent energy diverting impedance element or the short circuit is electrically connected between the device housing and a second switch throw; and e) wherein the at least one switch (266 1) is actuatable in response to: i) an electronic switching signal, or ii) an MRI static magnetic B 0 field sensor, and wherein I) in the absence of an electronic switching signal or an MRI static magnetic B 0 field, the at least one switch (266 1) electrically connects the switch pole electrically connectable from the lead (104, 106) including the electrode (108, 110) to the first switch throw electrically connected to the tissue-stimulating or biological-sensing circuits for the AIMD, and II) in response to receiving an electronic switching signal or in response to the MRI static magnetic B 0 field sensor detecting the presence of an MRI B 0 static magnetic field, the at least one switch (266 1) electrically disconnects the switch pole from the first switch throw and then electrically connects the switch pole to the second switch throw electrically connected to the frequency dependent energy diverting impedance element or the short circuit; wherein the frequency dependent energy diverting impedance element has diverter impedance characteristics that, at a selected RF frequency or frequency band, are partially tuned to lead impedance characteristics of an implantable leadwire (104, 106) that is electrically connectable to the pole of the at least one switch (266 1); wherein the selected RF frequency or frequency band comprises an MRI RF frequency or a range of MRI RF frequencies that are substantially centered at the MRI frequency; wherein the frequency dependent energy diverting impedance element has a diverter reactance that is equal and opposite a leadwire reactance of the implantable leadwire (104, 106) that is connectable to the pole of the at least one switch (266 1). a) at least one switch (266 1) having a pole that is electrically connectable to an implantable lead (104, 106) including an electrode (108, 110) configured for tissue-stimulating or biological-sensing; b) an energy dissipating surface provided by the device housing; c) a first switch throw that is electrically connected to tissue-stimulating or biological-sensing circuits for the AIMD; d) at least one frequency dependent energy diverting impedance element or a short circuit, wherein the frequency dependent energy diverting impedance element or the short circuit is electrically connected between the device housing and a second switch throw; and e) wherein the at least one switch (266 1) is actuatable in response to: i) an electronic switching signal, or ii) an MRI static magnetic B 0 field sensor, and wherein I) in the absence of an electronic switching signal or an MRI static magnetic B 0 field, the at least one switch (266 1) electrically connects the switch pole electrically connectable from the lead (104, 106) including the electrode (108, 110) to the first switch throw electrically connected to the tissue-stimulating or biological-sensing circuits for the AIMD, and II) in response to receiving an electronic switching signal or in response to the MRI static magnetic B 0 field sensor detecting the presence of an MRI B 0 static magnetic field, the at least one switch (266 1) electrically disconnects the switch pole from the first switch throw and then electrically connects the switch pole to the second switch throw electrically connected to the frequency dependent energy diverting impedance element or the short circuit; i) an electronic switching signal, or ii) an MRI static magnetic B 0 field sensor, and I) in the absence of an electronic switching signal or an MRI static magnetic B 0 field, the at least one switch (266 1) electrically connects the switch pole electrically connectable from the lead (104, 106) including the electrode (108, 110) to the first switch throw electrically connected to the tissue-stimulating or biological-sensing circuits for the AIMD, and II) in response to receiving an electronic switching signal or in response to the MRI static magnetic B 0 field sensor detecting the presence of an MRI B 0 static magnetic field, the at least one switch (266 1) electrically disconnects the switch pole from the first switch throw and then electrically connects the switch pole to the second switch throw electrically connected to the frequency dependent energy diverting impedance element or the short circuit;