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the circuit of phase-failure protector for electric motor (1

2016-09-02 09:29  
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the circuit of phase-failure protector for electric motor (1)
When any phase in three-phase power supply is missing because of some reason,the current transformer will lose the working current.The relay is released.The normally open contacts are disconnected.The AC contactor KM is released after power cut-off.It protects the electric motor from damage as the lose of phase.If the electric motor M is heating as the load is too heavy,the working current will increase.When the working current is beyond the set value,the thermal relay will take action.The normally closed contacts will disconnect.The AC contactor KM is released after power cut-off.Then you can cut off the working power supply of electric motor M.In order not to break down the electric motor because of overload .