Electricity: electrical systems and devices – Safety and protection of systems and devices
Patent
1986-05-15
1987-12-15
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
361 23, 361 31, H02H 300, H02H 700
Patent
active
047137169
ABSTRACT:
A detection device for contact fusion in an electromagnetic contactor in which an electric motor is connected by way of main contact of an electromagnetic contactor on the secondary side of a breaker equipped with electronic tripping device has a detection circuit for the voltage applied to the electromagnetic contactor coil connected in series with a pushbutton switch and a detection circuit for the voltage applied to the electric motor; a relay coil of a relay for detecting the contact fusion is connected to the tripping coil of the breaker and an ON-OFF element for supplying or interrupting the supply of an electrical current to the coil and a control circuit for the ON-OFF element are connected to the detection circuit for the voltage of the electrical motor both of the detection circuits are coupled with each other by a photocoupler, whereby the ON-OFF element is turned ON when the pushbutton switch is turned OFF in the case of the fusion of the main contacts, thereby exciting the relay coil to turn the detection relay for contact fusion to ON, by which the tripping coil is excited to trip the breaker so as to interrupt the operation of the electric motor.
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Shiomi Tadashi
Takemura Koichi
Kabushiki Kaisha Kamiuchi Denki Seisakusho
Pellinen A. D.
Wysocki A. Jonathan
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