ELECTROMAGNETIC SWITCHING DEVICE

摘要

PROBLEM TO BE SOLVED: To effectively suppress the heat generation of a first coil even if a situation that a large current in startup intermittently flows through the first coil occurs. SOLUTION: This electromagnetic switching device is provided with: a contact-actuating first coil 16 and a contact-keeping second coil 17 constituting an excitation coil; a first current-carrying circuit 38 for carrying a current to the first coil 16 only for a predetermined period in startup for closing a contact; a second current-carrying circuit 39 for carrying a current to the second coil 17 in order to keep the contact in the closed state; and a shutoff circuit 40 for shutting off the first current-carrying circuit 38 when the temperature of the first coil 16 exceeds a predetermined value to stop the current-carrying to the first coil 16. COPYRIGHT: (C)2006,JPO&NCIPI