The trip limits of the Z 4000 seem to be between 7.5 and 10 amps and as mentioned very fast. Please correct me if I'm wrong, the sum of both handles will shut the entire Z 4000 off, requiring reset of both the left and right handle.
Parallel-ing bricks which may require the use of Track Power Controller (TPC) can apply easily 15 to 20 amps to a track circuit. I distribute track power from Parallel PH135 via fuse blocks and fuses per track circuit at 7.5 amps. Limits dead short derail arc and spark welding notice at 20 amps. IMO.
Track power fuses upper left.
The 15 to 20 amps of current draw can also do damage to Block Power Controllers. (BPC's) I had to replace burned traces on both the BPC's pictured.
Trace damage and repair of an IC Controls BPC. Overload protection on the two PH 135's was 15 amps.
