CURRENT RELAY WITH MAGNETIC ATTRACTION OF PULL-IN ARMATURE Russian patent published in 2013 - IPC H01H51/06 

FIELD: electrical engineering.

SUBSTANCE: before reaching of the permitted limit pull-in armature with articulated non-ferromagnetic contact bar at load of electric wire is attracted to permanent magnet; when permitted load current is reached force of the coil and core electromagnetic field pulls away the pill-in armature with contact bar away from permanent magnet attraction thus entering the cavity and closing contacts in control circuit of magnetic starter. When actuated the magnetic starter opens closed contacts in loaf circuit of electric wire. When emergency modes occur pull-in armatures of two current relay with magnetic attraction of pull-in armature connected to two phases of electric motor and magnetic starter being pulled away from the permanent magnet close open contacts in the coil circuit of two interposing relays; when actuated the latter open in-series contacts in the circuits of magnet starter coil thus switching the electric motor off from emergency mode.

EFFECT: prevention of load for electric wire higher than the permitted current value; open-phase protection, overload protection stalled rotor protection and protection against open-phase ignition failure for the electric motor.

3 cl, 3 dwg