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Motor protection circuit

  • US 4,354,214 A
  • Filed: 09/11/1979
  • Issued: 10/12/1982
  • Est. Priority Date: 09/11/1979
  • Status: Expired due to Term
First Claim
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1. Apparatus for protecting an electrical motor connectable to an electric power source through a switchable circuit breaker means comprising:

  • a first protection circuit having first protection means for sensing a first plurality of elecrical parameters at the power source detrimental to the motor and first operation means for causing the circuit breaker to switch to an open condition disconnecting the motor from the power source,said first operation means being actuatable upon the sensing by the first detection circuit of a malfunction of any one of said first plurality of electrical parameters, anda second protection circuit comprising second detection means for sensing a second plurality of parameters on the side of the circuit breaker connected to the motor detrimental to the motor,second operation means for causing the circuit breaker to switch to an open condition and disconnect the motor from the power source,said second operation means being actuatable upon the sensing by said second detection circuit of any one of said detrimental second plurality of electrical parameters.

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