This series of thermal overload relay can be used in the circuit of 50Hz kr 60Hz, rated insulation voltage 660V, rated current 0.1-9sA for protecting the phase bresk when the electric motor isoverload. The relay has different mechanism and temperature compensation & can be pluged inLC1-D series AC contactor. It is the most advanced thermal relay in the nineties in the world. The products comply with IEC60947-4.