The PSXX is compatible with PSX-AR and previous generation PSX-1,-2,-3,-4 circuit breakers. If you are using both PSXX circuit breakers and PSX-AR auto reversers on a layout, make sure the PSX-AR J1 input is taking power from the J2 DCC track output of the PSXX.

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Below are some essential wiring diagrams for multiple power districts, boosters, and wyes.
If you want the full benefit of the PSXX ability to limit the maximum current in a particular block, then you must either define the reverse loop as part of a PSXX block or add a PSXX in series with each PSX-AR as shown in the diagrams.

The PSX-AR is essentially the previous generation PSX with an added polarity reversing capability. Hence, each one can supply its own power district. The PSXX has an added feature: it not only acts as a circuit breaker, it also limits the maximum amount of current that the block can draw while the block is shorted but before the breaker trips. This feature isolates the booster and other power districts from the fault condition. We show the PSX-AR in series with the PSXX breaker so that the PSX-AR can benefit from the current limiting feature of the PSXX.

If you are reasonably sure that accidents are unlikely in the reverse loop, or if the current limiting feature of the PSXX is not necessary for your reverse loop, you can connect the PSX-AR directly to the booster (as in the PSX-AR and older PSX instructions). In this configuration, the PSXX in the power district adjacent to the reverse loop may or may not limit the fault current when your engine crosses the reverse loop gaps. How the PSXX and PSX-AR interact depends on whether the current at the reverse loop boundary flows through the PSXX return or not. 

So, if the PSX-AR is wired directly to the booster, sometimes you may get current limiting, and sometimes you may not during the time it takes the PSX-AR to reverse. If there is no actual fault in the reverse loop, you probably will not notice the difference between the two configurations. However, without the PSXX in series with the PSX-AR, a fault in the reverse loop may affect other power blocks unless you set the PSX-AR to the manual reset mode. Note: the trip current of the PSXX adjacent to the reverse loop must be set to a trip current higher than the setting of the PSX-AR (or set the PSX-AR trip current lower than the PSXX).