Polarized electromagnetic relay

Claim 1

A POLARIZED ELECTROMAGNETIC RELAY INCLUDING A PAIR OF CONTACTS AND A MAGNETIC SYSTEM ELECTRICALLY ENERGIZABLE TO ACTUATE THE CONTACTS, THE MAGNETIC SYSTEM COMPRISING A FIRST SECTION OF FERROMAGNETIC MATERIAL AND HAVING A LOW MAGNETIC RELUCTANCE, A SECOND SECTION AT LEAST PARTLY OF FERROMAGNETIC MATERIAL AND HAVING A SUBSTANTIALLY HIGHER MAGNETIC RELUCTANCE, THE FIRST AND SECOND SECTIONS BEING MAGNETICALLY CONNECTED TOGETHER IN A SERIES MAGNETIC CIRCUIT, A THIRD SECTION ARRANGED MAGNETICALLY IN PARALLEL WITH THE FIRST SECITON, MAGNETIC FLUX PRODUCING MEANS ARRANGED IN THE SAID SERIES MAGNETIC CIRCUIT FOR PASSING A FLUX THROUGH THE CIRCUIT SO AS TO DEVELOP ACROSS THE FIRST AND THIRD SECTIONS OF THE MAGNETIC SYSTEM A MAGNETO-MOTIVE FORCE OF PREDETERMINED LOW MAGNITUDE, AN ELECTRICALLY ENERGIZABLE COIL MOUNTED IN MAGNETIC RELATIONSHIP WITH THE FIRST SECTION AND OPERABLE WHEN ENERGIZED TO PRODUCE A FLUX ACTING IN THE OPPOSITE DIRECTION TO THE SAID FLUX PASSING THROUGH THE FIRST SECTION SO AS TO INCREASE THE MAGNETO-MOTIVE FORCE ACROSS THE FIRST AND THIRD SECTIONS, AND CONTACT ACTUATING MEANS OPERATIVE TO ACTUATE THE CONTACTS OF THE RELAY WHEN THE MAGNETOMOTIVE FORCE ACROSS THE THIRD SECTION IS GREATER THAN THE SAID PREDETERMINED LOW MAGNITUDE.