Patent ID: 8536961

Claim:
A reversible electromagnetic contactor in which a pair of electromagnetic contactors is disposed adjacently to move respective operation indication pieces protruding on upper surfaces in a same direction in a closing operation and a reversible unit is mounted across the upper surfaces of the pair of electromagnetic contactors, wherein the reversible unit comprises a pair of interlock plates detachably connected to the respective operation indication pieces of the pair of electromagnetic contactors and moving in a same direction as a moving direction of the operation indication pieces, a lock piece connecting with the pair of interlock plates, a first normally-closed contact, a second normally-closed contact, and a unit case accommodating the pair of interlock plates, the lock piece, and the first and second normally-closed contacts, and mounted across the upper surfaces of the pair of electromagnetic contactors, wherein in a closing operation of one of the electromagnetic contactors, the lock piece rotates in a first direction together with a movement of one of the interlock plates to prevent the other of the interlock plates from moving, and to maintain a release operation of the other of the electromagnetic contactors, and in a closing operation of the other of the electromagnetic contactors, the lock piece rotates in a second direction, different from the first direction, together with a movement of the other of the interlock plates to prevent the one of the interlock plates from moving, and to maintain a release operation of the one of the electromagnetic contactors, wherein the first normally-closed contact is connected in series in a power supply circuit to an exciting coil of the other of the electromagnetic contactors, and the one of the interlock plates includes a first opening operation engagement portion performing a release operation of the first normally-closed contact when the one of the interlock plates moves, and the second normally-closed contact is connected in series in a power supply circuit to an exciting coil of the one of the electromagnetic contactors, and the other of the interlock plates includes a second opening operation engagement portion performing a release operation of the second normally-closed contact when the other of the interlock plates moves, and wherein the first normally-closed contact comprises a first fixed contact and a first movable contact having a spring member, and is disposed along a moving direction of the one of the interlock plates; and when the one of the interlock plates moves, the first opening operation engagement portion moving toward the first normally-closed contact elastically deforms the first movable contact in a direction withdrawing from the first fixed contact to establish an open state.