JR30 series thermal relay is used in the circuit of 50/60Hz, rated insulation voltage 660V,rated current 0.1-85A for protecting 1.Application JR30 series thermal relay is used in the circuit of 50/60Hz, rated insulation voltage 660V,rated current 0.1-85A for protecting the phase break when the electric motor is overloaded. Therelay has different mechanism and temperature compensation. It can be ...