Magnetic switch and circuitry for safety shut down of power equipment

In a fault-sensitive safety monitoring and shut down system for power equipment having electrically controlled operating components whose individual functions are essential to safe operation of said equipment, an electromagnetic switch having a coil and having normally closed and normally open contacts, a power terminal for the switch which is electrically coupled with said normally closed contact, an external grounding terminal which is electrically coupled with said coil, a first switch terminal, a resistance element coupled between the first switch terminal and said normally closed contact, a second switch terminal electrically coupled with said coil, and additional switch terminals electrically coupled with said operating components, said last-named switch terminals coupled one each with said normally closed and normally open contacts, the improvement comprising a plurality of normally open and grounded safety switches electrically coupled with said first switch terminal, and a second plurality of normally closed switches coupled between said first and second switch terminals, said first-named plurality and second plurality of switches being electrical fault-sensing switches.