Type of Inverter: PT A and PT B : Now replaced by MV180, A direct replacement for original control boards with identical wiring connectors so it will fit directly onto existing wiring and mountings. Suitable for all PTA and PTB, A programmed micro processor based system which comes complete with installation manual and set up instructions. suitable for all frequency ranges and power ratings. Easy to install and easy to use. Not compatible with inverters with digital display Melt Manager or Melt Minder systems.