Input protection terminal 5 group. 
Rated voltage range, not afraid of voltage drop, resulting in SCR control instability phenomenon. 
Modular design, easy maintenance. 
Plastic case is not at risk of electric shock. 
Fan patented use of the way, greatly overcome the difficulties of maintenance is not easy. Patented product. 
Patented product, counterfeit. 
Ordering Information: Name = PT A BBB C D E 
                      For example = PT 1 020 2 X A (see table below)