Magnetic trigger for a selectively operative switch

A magnetic triggering apparatus for a selectively operative switch, comprising:

• a plunger-type armature containing a plunger for operating upon contacts of the selectively operative switch;
• a magnetic coil for actuating said plunger-type armature and said plunger for operating upon said contacts of said selectively operative switch in the presence of a current flowing through said magnetic coil and at least corresponding to a predetermined threshold current;
• a pivotable armature arranged at said magnetic coil;
• said pivotable armature being operatively associated with said plunger-type armature;
• said magnetic coil defining a magnetic flux;
• said pivotable armature defining a magnetic return path for a magnetic return flux of the magnetic flux defined by said magnetic coil;
• a switch lock mechanism for locking said selectively operative switch in a predetermined switching state;
• tripping means operatively associated with said switch lock mechanism;
• and
• said tripping means acting upon said switch lock mechanism for locking said selectively operative switch in said locked predetermined switching state.