TeSys LR9F electronic overload relay, thermal setting range 380-630A, class 20, for protection of motors 250-355kW@400V.to be mounted directly below a TeSys F 3-pole contactor LC1 F400, F500, F630, F800, use of a support mounting plate LA7F902 is mandatory (to be ordered separately).Motor protection includes thermal overload of 1-phase and 3-phase motors, phase failure, phase unbalance, prolonged starting times, stalled rotor conditions.On the front of the relay, it provides a thermal adjustement dial, buttons for test, stop