A safety switch with detection of the end-stroke of the unlocking mechanism adapted to supervise a safety access of a machine or industrial plant comprises a switching device (2) adapted to be associated to the fixed part of an access to be supervised and having switching means (5) adapted to be operatively connected to one or more control and/or service circuits of the plant for the control thereof, an operating device (3) associated to a movable part of the access to interact with the switching means (5) at the time of opening/closing of the access for opening/closing of one or more circuits, an unlocking mechanism (13) housed in the switching device (2) and having an unlocking pin (14) adapted to translate with maximum predetermined stroke from a blocking position of the access to an unlocked position to determine the opening of the switching means (5), means (17) for the detection of the stroke of the unlocking pin (14) comprising a first detector (18) adapted to detect the start of the stroke of the unlocking pin (14) and a second detector (19) adapted to detect the end of the stroke of the unlocking pin (14).

Apparatus and method for latching one pole contact of at least one springy pole in one of a relay and an hybrid switch for maintaining one of engaging and disengaging state of at least one first contact with said pole contact by a mechanical latching device comprising a springy lock pin exerting minute force, a slider with indentation path for guiding the lock pin and a track for the slider, the latching device extends from an armature or the springy pole to a base or a body of the relay or the hybrid switch, said springy pole is guided by said slider movement propelled by one of a pull by a voltage rated magnetic coil fed by a pulse of said rated voltage and a push by a plunger, and for operating a stronger coil for switching higher electrical current the magnetic coil is fed with combination with at least one discharge higher voltage to increase the magnetic pull power of the coil.

Apparatus and method for latching one pole contact of at least one springy pole in one of a relay and an hybrid switch for maintaining one of engaging and disengaging state of at least one first contact with said pole contact by a mechanical latching device comprising a springy lock pin exerting minute force, a slider with indentation path for guiding the lock pin and a track for the slider, the latching device extends from an armature or the springy pole to a base or a body of the relay or the hybrid switch, said springy pole is guided by said slider movement propelled by one of a pull by a voltage rated magnetic coil fed by a pulse of said rated voltage and a push by a plunger, and for operating a stronger coil for switching higher electrical current the magnetic coil is fed with combination with at least one discharge higher voltage to increase the magnetic pull power of the coil.

Micro-electromagnetically actuated latched miniature relay switches formed from laminate layers comprising a spring and magnet, electromagnetic coils, magnetic latching material, and transmission line with contacts. Preferably the miniature relay switches transmit up to about 50 W of DC or AC line power, and carry up to about 10 A of load current, with an overall volume of less than about 100 mm.sup.3. In addition to switching large power, the device preferably requires less than 3 V to actuate, and has a latching feature that retains the switch state after actuation without the need for external applied voltage or current.

Micro-electromagnetically actuated latched miniature relay switches formed from laminate layers comprising a spring and magnet, electromagnetic coils, magnetic latching material, and transmission line with contacts. Preferably the miniature relay switches transmit up to about 50 W of DC or AC line power, and carry up to about 10 A of load current, with an overall volume of less than about 100 mm.sup.3. In addition to switching large power, the device preferably requires less than 3 V to actuate, and has a latching feature that retains the switch state after actuation without the need for external applied voltage or current.

A leakage protective plug and a tripping mechanism thereof, comprising a housing, and a tripping mechanism and a conducting structure arranged within the housing, wherein the tripping mechanism comprises a restorable reset button, a tripping bracket, and a tripping coil and a pressing arm arranged in the tripping bracket, wherein the reset button is sleeved in the pressing arm in which a snap fitting mechanism is positioned such that the pressing arm and the reset button may be snapped together, and the pressing arm and the reset button may be disengaged under the control of the tripping coil. It has a simple and reliable structure, and avoids technical problems including poor contact of supply circuit and failure of power leakage protecting functions due to un-complete tripping which are resulted from the deformation of the tripping plate caused by the movement of the tripping iron core and by other external forces.

A magnetic switching arrangement including a first contact, a second contact, at least one of the first and second contacts including a magnetically responsive material, a biaser operably connected to one of the first and second contacts and biasing the one of the first and second contact into electrical connection with the other of the first and second contacts such that a closed circuit is achieved in the absence of an external force preventing closure of the first and second contacts, and a disconnector maintaining the first and second contacts spaced from one another, preventing formation of a circuit. A method for operating a tool including applying or removing a magnetic field configuration and causing a first and second contact within the tool to make electrical contact. A borehole system including a borehole in a subsurface formation, and disposed in the borehole.

A magnetic switching arrangement including a first contact, a second contact, at least one of the first and second contacts including a magnetically responsive material, a biaser operably connected to one of the first and second contacts and biasing the one of the first and second contact into electrical connection with the other of the first and second contacts such that a closed circuit is achieved in the absence of an external force preventing closure of the first and second contacts, and a disconnector maintaining the first and second contacts spaced from one another, preventing formation of a circuit. A method for operating a tool including applying or removing a magnetic field configuration and causing a first and second contact within the tool to make electrical contact. A borehole system including a borehole in a subsurface formation, and disposed in the borehole.

An electromechanical relay comprises a contact assembly including a stationary contact and a movable contact, an electromagnetic actuator assembly actuating the movable contact, a housing encasing the contact assembly and the electromagnetic actuator assembly, and a test button that is rotatable and engages the actuator arm. The electromagnetic actuator assembly includes a coil assembly generating a magnetic field and an actuator arm that is movable to engage the movable contact and actuate the movable contact in response to the magnetic field. The actuator arm is slidable in a direction transverse to a longitudinal axis of the movable contact. The movable contact is manually operable from outside the housing by rotating the test button.

An electromagnetic relay includes: a coil; a housing that supports the coil; a non-movable portion supported by the housing and including a fixed core and a fixed magnetic path defining member; and a movable portion provided to be reciprocally movable along a center axis line of the coil according to an energization state of the coil. The movable portion includes a movable core disposed to face the fixed core along the center axis line. The movable portion integrally has a flange portion protruding in a coil radial direction perpendicular to the center axis line to define a separation distance and/or a facing area in a magnetic gap between the fixed magnetic path defining member and the movable core by abutting against the non-movable portion.