The Z21 multi LOOP reverse loop module is ideal for the comfortable and safe operation of track layouts such as terminal loops, triangular junctions and turntables.
Features
    Short-circuit detection - easiest wiring
    Sensor tracks - short circuit free detection
    Switching contacts - detection via circuit tracks or reed contacts
    Combined operation - double safety
Compatible with
    DCC
    MM
    RailCom
    Analogue mode
Since sensor tracks / sections are not themselves supplied with power, they must not be too long, especially with regard to short, slower locomotives. Ideally they should be between 4.0 and 5.5 cm long in H0 and 2.0 to 3.0 cm in N.