This decoder is for converting Marklin/Trix H0 locomotives with built-in high-efficiency motors or other DC motors. The marklin LokDecoder3 has a wiring harness soldered to the circuit board; and this wiring harness already has an 8-pin NEM interface plug mounted on it for converting many locomotives with a corresponding NEM interface and for locomotives with a shortage of space.

The Marklin LokDecoder3 supports the digital formats mfx; MM 1; MM2; and DCC.