Provided is a relay having a structure for preventing deformation of a movable spring when it is caulked. A yoke of the relay has a protrusion for caulking inserted in the movable spring, and a bulge portion adjacent to the protrusion and having a height lower than a height of the protrusion. By providing the bulge portion to the yoke, the dimensional change in the caulking direction of the movable spring when the movable contact is caulked can be reduced.

Provided is a relay having a structure for preventing deformation of a movable spring when it is caulked. A yoke of the relay has a protrusion for caulking inserted in the movable spring, and a bulge portion adjacent to the protrusion and having a height lower than a height of the protrusion. By providing the bulge portion to the yoke, the dimensional change in the caulking direction of the movable spring when the movable contact is caulked can be reduced.

A trip unit for a circuit breaker includes a magnetic flux transfer system that employs a permanent magnet(s) and solenoid(s) with a ferromagnetic core. The system generates an attractive force using a solenoid to counter the force of a reset spring and latch friction force when a tripping condition is detected. The generated attractive force together with an attractive force from the magnet attracts a yoke which in turn moves the yoke together with an armature to the tripped position. The system also retains the yoke and armature in the tripped position using the attractive force of the magnet when the generated attractive force is no longer being generated. The system further generates a repulsive force using a solenoid when a resettable condition is satisfied to counter the attractive force of the magnet thereby allowing the yoke and armature to move from the tripped position to the reset position.

A trip unit for a circuit breaker includes a magnetic flux transfer system that employs a permanent magnet(s) and solenoid(s) with a ferromagnetic core. The system generates an attractive force using a solenoid to counter the force of a reset spring and latch friction force when a tripping condition is detected. The generated attractive force together with an attractive force from the magnet attracts a yoke which in turn moves the yoke together with an armature to the tripped position. The system also retains the yoke and armature in the tripped position using the attractive force of the magnet when the generated attractive force is no longer being generated. The system further generates a repulsive force using a solenoid when a resettable condition is satisfied to counter the attractive force of the magnet thereby allowing the yoke and armature to move from the tripped position to the reset position.

Component assemblies and methods of manufacturing component assemblies that include a magnetic yoke assembly for electromechanical contactors and relays are disclosed. In a particular embodiment, a component assembly that includes a magnetic yoke assembly for electromechanical contactors and relays is described. In this embodiment, the magnetic yoke assembly includes a movable contact and a ferromagnetic upper yoke mounted in above the moveable contact and separate from the moveable contact. The magnetic yoke assembly also includes a ferromagnetic lower yoke mounted under the moveable contact.

Component assemblies and methods of manufacturing component assemblies that include a magnetic yoke assembly for electromechanical contactors and relays are disclosed. In a particular embodiment, a component assembly that includes a magnetic yoke assembly for electromechanical contactors and relays is described. In this embodiment, the magnetic yoke assembly includes a movable contact and a ferromagnetic upper yoke mounted in above the moveable contact and separate from the moveable contact. The magnetic yoke assembly also includes a ferromagnetic lower yoke mounted under the moveable contact.

An electromagnetic relay includes a moving member, a yoke, a guide member, and a movable iron core. The yoke includes a plate portion and a yoke hole. The guide member is disposed in the yoke hole. The movable iron core is connected to the moving member. The movable iron core includes a tubular portion. The tubular portion includes a first end surface and a second end surface. The tubular portion is disposed in the guide member. The plate portion includes a first surface and a second surface. In a case where the moving member is located at the closed position, the first end surface is located within a range from a first position to a second position. The first position is a position corresponding to the first surface. The second position is located at a center of the first surface and the second surface.

An electromagnetic relay includes a moving member, a yoke, a guide member, and a movable iron core. The yoke includes a plate portion and a yoke hole. The guide member is disposed in the yoke hole. The movable iron core is connected to the moving member. The movable iron core includes a tubular portion. The tubular portion includes a first end surface and a second end surface. The tubular portion is disposed in the guide member. The plate portion includes a first surface and a second surface. In a case where the moving member is located at the closed position, the first end surface is located within a range from a first position to a second position. The first position is a position corresponding to the first surface. The second position is located at a center of the first surface and the second surface.

An electromagnetic relay includes a fixed contact, a moving contact, an electromagnet device, and a second coil. The moving contact moves from a closed position where the moving contact is in contact with the fixed contact to an open position where the moving contact is out of contact with the fixed contact, and vice versa. The electromagnet device includes a first coil and a mover. The mover is actuated on receiving a magnetic flux generated when a current flows through the first coil to move the moving contact from one of the closed position or the open position to the other position. The second coil gives, when a current flows through the second coil, at least a magnetic flux, of which a direction is opposite from a direction of the magnetic flux generated by the first coil, to the mover.

An electromagnetic relay includes a fixed contact, a moving contact, an electromagnet device, and a second coil. The moving contact moves from a closed position where the moving contact is in contact with the fixed contact to an open position where the moving contact is out of contact with the fixed contact, and vice versa. The electromagnet device includes a first coil and a mover. The mover is actuated on receiving a magnetic flux generated when a current flows through the first coil to move the moving contact from one of the closed position or the open position to the other position. The second coil gives, when a current flows through the second coil, at least a magnetic flux, of which a direction is opposite from a direction of the magnetic flux generated by the first coil, to the mover.