1. AN OVERLOAD-RESPONSIVE ELECTRIC SWITCH-OPERATING DEVICE, COMPRISING A SUPPORTING STRUCTURE, A ROTARY POWER OUTPUT SHAFT ROTATABLY MOUNTED IN SAID SUPPORTING STRUCTURE, A ROTARY DRIVEN ELEMENT DRIVINGLY CONNECTED TO SAID SHAFT, A ROTARY DRIVING ELEMENT ROTATABLY MOUNTED ADJACENT SAID DRIVEN ELEMENT, A ROTARY LOAD-SENSING ABUTMENT MEMBER ABUTTING SAID ROTARY DRIVING ELEMENT IN FRICTIONAL DRIVEN ENGAGEMENT THEREWITH, MEANS YIELDINGLY URGING SAID DRIVING ELEMENT INTO YIELDING DRIVING ENGAGEMENT WITH SAID DRIVEN ELEMENT AND SAID LAOD-SENSING MEMBER INTO YIELDING DRIVEN ENGAGEMENT WITH SAID DRIVING ELEMENT, A SWITCH-OPERATING MEMBER SPACED AXIALLY AWAY FROM SAID LOAD-SENSING ABUTMENT MEMBER IN RELATIVELYROTATABLE AXIALLY-SLIDABLE RELATIONSHIP THEREWITH, A PLURALITY OF CIRCUMFERENTIALLY-SPACED MULTIPLE-ARMED ROTATION-TRANSMITTING ELEMENTS SPACED RADIALLY AWAY FROM THE AXIS OF SAID SHAFT DISPOSED BETWEEN SAID MEMBERS WITH THEIR ARMS NORMALLY DISPOSED OBLIQUE TO SAID AXIS AND RESPONSIVE TO ROTATION OF SAID LOADSENSING ABUTMENT MEMBER RELATIVELY TO SAID TOWARD OPERATING MEMBER FOR ROTATING SAID ARMS TOWARD PAALLELISM WITH SAID AXIS AND THEREBY MOVING SAID SWITCH-OPERATING MEMBER AXIALLY AWAY FROM SAID LOAD-SENSING ABUTMENT MEMBER, AND AN ELECTRICAL SWITCH HAVING AN OPERATING PART POSITIONED IN THE PATH OF SAID SWITCH-OPERATING MEMBER FOR SHIFTING THEREBY IN RESPONSE TO AXIAL MOTION THEREOF RELATIVELY TO SAID LOAD-SENSING ABUTMENT MEMBER.