Megger rcdt330 rcd tester megger rcdt330 de sc p font size 4 the megger rcdt330 rcd tester is safe even if it connected to a live three phase supply in error it will remain undamaged and present no safety hazard to the user introduced after extensive customer research these innovative instruments are rugged with straightforward operation and they are offered at very competitive prices font font size 4 the rcdt330 has a remote test mode that allows the instrument to be in one place whi