The 3UA design thermal overload relay can be used in the Circuit of 50Hz or 60Hz, rated insulation voltage 660V, rated Current 0.1-140A for protecting the phase break when the Electric motor is overload.
The relay has different mechanism and temperature compensation & can be pluged in 3TH, 3TB, 3TF series AC contactor.
It is the most advanced thermal relay in the nineties in the World. The products comply with IEC 60947-5.