This series of thermal relays can be used in the circuit of 50Hz or 60Hz, rated insulation voltage 690V, rated current 0. 1-93A for protecting the phase break when the electric motor is overload. A. Fundamental parameter of the main circuit ~ rated insulation voltage 690V Rated working current 25, 36, 93A separately ~Current of the thermal components B. Auxiliary Circuit ~ There are one pair of N/O and N/C contacts with electric insulation ~ Rated insulation voltage 500V ~ Rated frequency 50-60Hz