For the Powercab Starter Set you are limited to the CP6 ONLY.
ALL other boosters and command stations can use the CP6 or the EB1.
*** Note - If you have a Powercab and a Booster remember that the Booster is now what is running trains NOT the Powercab.
The SB3 and DCC Twin are 3 amps and can use the CP6 or the EB1.
The SB3a, SB5, and all Power Pro systems are 5 amps and can use the CP6 or the EB1.
You MUST use some form of Protection!
To clarify you would use either the CP6 or the EB1 but not both. The CP6 is used with the Powercab and provides basic current limiting protection of 1 amp per section for 6 areas. The EB1 is a single power district electronic breaker that can be configured via CV values. The lowest setting of an EB1 is 2.5 amps. This makes it unsuitable for the 2 amp Powercab rating. The EB1 is only used in 3 or 5 amp systems.
Short circuit protection is done different internally between the two systems. This is due to the construction of the power supplies in the Powercab and the PH Pro. The EB1 has no current limit protection. EB1 is a single block item. It will draw the full current capacity of the booster if dead short. It cannot be set low enough to be used with a Powercab. Lowest breaker setting on an EB1 is 2.5 amps.
CP6 is a current limiting device. Full 2 amp in from Powercab, output is 6 - 1 amp power districts with current limiting. Bulbs are in series with load. CP6 will not make Powercab reboot. Will allow 1 amp to pass thru, rest of load (up to 12 amps) will burn off as heat / light. Multiple sections of CP6 can be used in parallel to create larger limits.