A polarized DC electromagnetic device and electromagnetic contactor using same to improve assembly efficiency without size increase of the electromagnetic device. The device includes a plunger inserted through a cylindrical portion of a spool around which an excitation coil is wound and having a first armature and a second armature attached to both ends, an outer yoke attracting the first armature and the second armature, an inner yoke disposed inside the outer yoke and attracting the second armature, and a permanent magnet disposed between the outer yoke and the inner yoke. The spool includes radially protruding flange portions respectively formed at both ends of the cylindrical portion, a coil terminal attachment portion formed in the flange portion on the first armature side, and a coil terminal attached to the coil terminal attachment portion.

A relay includes a movable block, a base substrate, and a coil block. The movable block is provided rotatably around a rotational axis of the movable block. The movable block includes a plurality of sliders. The base substrate is disposed opposite the movable block in the rotational axis direction of the movable block, and contacts the sliders. The base substrate includes a plurality of contactors that come into contact with the sliders. The coil block includes a coil that generates electromagnetic force by electric conduction to rotate the movable block with respect to the base substrate. As the movable block rotates, continuity is switched between the sliders and the contactors.

A switching device, for a wye-delta switch in a multiphase motor each phase having one motor winding having a connection pair and contact device (CD), has an electromagnetic drive for drive axle movement between three axial positions, the CD having first and second motor winding connection contacts (MWCC), phase connection contact (PCC), and movable contact bridge (MCB) coupled to the drive axle and movable thereby into the three positions. In position-1, axially between positions-2/3, the MCB is openno CC is connected to another CC by the MCB; in position-2, the MCB is in wye contact positionthe MCB connects the PCC to the first MWCC, and the second MWCC is connected to the second MWCC of all other CDs using the wye coupled to the drive axle; and in position-3, the MCB is in a delta contact positionthe MCB connects the FCC to the first and second MWCC.

A latching relay includes a first coil, a second coil and a common plunger operatively connected between the first and second coils such that activation of the first coil moves the plunger to a first position and activation of the second coil moves the plunger to a second position. The latching relay also includes a limit switch having a common contact and first and second coil contacts. A position of the common contact is alternately switched between electrical connection to either the first or second coil contact based on a position of the plunger. The first and second coil contacts are electrically connected to the first and second coils, respectively such that when electrical power is applied to the common contact, the electrical power is alternately applied to either the first coil or the second coil depending on the position of the common contact.

An overload relay is disclosed in which a single operator coil is controlled for both tripping and resetting. A permanent magnet and a spring make the device bi-stable, so the coil may be unpowered when in the trip and reset states. Energization of the coil overcomes the magnet to allow tripping, while energization in an opposite direction adds to the magnet force to reset the device. An electromagnetic activation path overrides a mechanical activation path for electromagnetic tripping despite attempted manual resetting. The device may be pulse width modulated to reduce power consumption

A relay control circuit for use with a relay having a coil voltage input. The relay control circuit includes a first input to receive a first voltage capable of energizing the relay from a de-energized state, a second input to receive a second voltage, less than the first voltage, that is capable of maintaining the relay in an energized state, and means, responsive to a relay control signal having one of a first state and a second state, for switchably coupling the coil voltage input to the first input for a period of time sufficient to energize the relay in response to the relay control signal having the first state, and for switchably coupling the coil voltage input to the second input in response to expiration of the period of time.

A latching electromechanical RF switch is formed with an RF switch cavity having at least one inlet port and at least one outlet ports having switch contacts. A leaf contact member moveable between a first contact position connecting the switch contacts and a second position spaced from the switch contacts. A solenoid mounted in the cavity. A housing is formed with a hollow passage. An intermediate permanent magnet provided within the housing. A connecting member assembly is moveable within the hollow passage. The contact leaf member is connected to one end with a permanent magnet provided at another end of the connecting member. The intermediate magnet attracts and retains the permanent magnet and the contact leaf member in the first contact position. Upon reaching the first contact position electric current supply to the solenoid is terminated.

An improved bi-stable electrical solenoid switch comprising a solenoid being wound with coil windings. The solenoid having a central aperture defined therein, and the coil windings, which when engaged by a power source, generates a magnetic field. A magnetic coupling member mounted on the solenoid. A plunger partially disposed in the central aperture for movement into and out of the central aperture. A conductive plate coupled to the plunger and provided with contacts on each end of the conductive plate. The conductive plate configured to electrically engage and disengage the solenoid upon respective application of power to the solenoid. The magnetic coupling member configured to reduce the force needed by the solenoid to remain in an open position when selectively energized for moving and retaining the conductive plate of the plunger against the solenoid for allowing wide operating voltage and reduced operating power.

A device preventing misoperation of a vehicle acceleration pedal includes an induction coil, a pedal arm, an electromagnet, and a processor. One end of the pedal arm fastens to the vehicle acceleration pedal, and the other end of the pedal arm inserts into the induction coil. The processor is electrically connected to the induction coil and the electromagnet and the pedal arm is magnetically attracted when the electromagnet is powered on by the processor, preventing the acceleration pedal being used as a brake pedal.

Deep via technology is used to construct an integrated silicon cantilever and cavity oriented in a vertical plane which creates an electrostatically-switched MEMS switch in a small wafer area. Another embodiment is a small wafer area electrostatically-switched, vertical-cantilever MEMS switch wherein the switch cavity is etched within a volume defined by walls grown internally within a silicon substrate using through vias.