I'd forget the TMCC Lockon. It really doesn't bring anything to the party, the PH180 brick has an excellent circuit breaker. In addition, the TMCC Lockon kills the DCS signal, if you plan on running MTH DCS equipment, it's a really bad choice!
Finally, a long time ago, I was actually using the TMCC Lockon with my bricks. Indeed it would trigger before the bricks, and it even triggered when it shouldn't! To dispel the notion that it was just a defective lockon, I tried three of them, all had the same issue. Out of a couple dozen TMCC & Legacy locomotive (and one MTH DCS model), it would trip on four of them when the locomotive passed close to the connection point of the lockon, but not other track drops that fed off of it. There was nothing wrong with the engines it was triggering on. It was an equal opportunity failure, a couple were factory new Legacy, one was a TMCC upgrade using ERR components, and one was a factory PS/2 engine. This didn't happen every pass, just once about every three or four times by. When we found out at the club that the TMCC Direct Lockon was killing our DCS signal, that was the last straw, I sold all mine, and I removed all the lockons at the club.
