Patent ID: 7262942

Claim:
A low arc AC contactor comprising an on/off mechanism ( 2 ) of electromagnetic-controlled contacts having coils L 1 , L 2 for converting electric energy into magnetic energy, whereby allowing the contacts to be in engaging or disengaging condition, characterized in that, said contactor further comprises: a pulse power source generating circuit ( 1 ) in which its input is connected to R and T terminals for providing two pulse power sources, and both are controllably connected to coil L 1 and coil L 2 respectively, and a low arc trigger generating circuit ( 3 ) in which a pulse DC voltage signal generated by said pulse power source generating circuit ( 1 ) is received in order to establish a time coordinate signal of the lowest potential in an AC power source cycle, and an external trigger on/off controlling command is received to provide with on-command trigger pulse to said pulse power source generating circuit ( 1 ) so that a strong pulse magnetic field is generated in coil L 1 , thus resulting in the contacts being in engaging condition, as well as to provide with off-command trigger pulse or an power outage auto-cutout trigger pulse to said pulse power source generating circuit ( 1 ) so that a strong pulse magnetic field is generated in coil L 2 , thus resulting in the contacts being in disengaging condition.