Another issue is the main bridge rectifier. Many of the std-gauge engines use a tethered bridge to keep the diode bridge from overheating and causing excessive leakage which will kill the FET's. Lots of early Legacy engines used a tethered bridge on the DCDS as well for the same reason. Jon Z. mentioned this several times for the ERR products, he specifically told me that the limiting factor is usually the bridge rectifier. I recently used the ERR Cruise Commander to drive the six motored K-line A-B-A set using a tethered bridge. I used a 12A bridge and bolted it to the chassis for heatsinking, the FET heatsink on the Cruise Commander barely gets warm.
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