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Patent Searching and Data


Matches 501 - 550 out of 4,777

Document Document Title
WO/1996/000457A1
An electrical safety device for controlling the supply of power from a power supply such as a mains power supply to an appliance, such as an electrical powered lawnmower, is disclosed. The safety device comprises means for monitoring the...  
WO/1995/031028A1
A detector for monitoring the integrity of a ground connection to an electrical appliance having live and neutral terminals for feeding current to the appliance from respective live and neutral feeders of an electrical supply having a gr...  
WO/1995/026586A1
A fault current safety switch has a thyristor (1) which when ignited simulates a fault current in a summing current transformer (5). An ohmic resistance (2) and a PTC resistance (3) interconnected in series are connected in parallel to t...  
WO/1995/024757A1
An electrical safety device (3) is disclosed which utilizes a sensor conductor (16) configured in a continuous loop and disposed in an electrical component (12) so as to sense overtemperature or mechanical damage over a length or wide ar...  
WO/1995/020307A1
A heater for a heating pad uses heating elements of positive temperature coefficient (PTC) material arranged in parallel between a conductor connected through a fuse (5) to an ungrounded pole of electric a.c. mains and a conductor connec...  
WO/1995/017032A1
A clocked current supply has a fault current detector (32) that evaluates a voltage drop occurring at an ohmic measurement resistance (25) and supplies a switching-off signal (40) to a clocked voltage transformer (5). The ohmic measureme...  
WO/1995/006350A1
A magnetic thermal shutdown for use in a power converter comprising a pair of switching elements connected in a bridge mode configuration; a control device for controlling the switching operation of the switching elements; a resonant net...  
WO/1994/028608A1
In response to the loss of a generator in an electrical power system, all operating electrical loads are automatically switched to a second generator, and the electric power system continues to provide power to all of the loads. The tota...  
WO/1994/027348A1
Method for making an electrical power distribution point safe, particularly an electrical socket (1), in an electrical power supply system (2). Initially the output port (3) of the distribution point is not live and a monitoring sequence...  
WO/1994/019854A1
An electrical supply safety plug (202) that prevents power from a mains electrical supply (204, 206, 208) from being accessible to an electrical appliance (214) unless the electrical supply safety plug is properly engaged with the socket...  
WO/1994/017573A1
An electrical supply safety socket (200) that prevents power from a mains electrical supply (12, 14, 16) to be accessible at the outlets of the socket (18, 22, 20) unless an electrical appliance is properly engaged with the socket outlet...  
WO/1994/011939A1
A safety shut-off switch assembly (22) is provided for deenergizing power supplied to a plurality of wall panels (10 and 12) which are electrically coupled together and configured to form a plurality of office cubicles. The safety shut-o...  
WO/1994/011937A1
The present invention provides a current limiting short-circuiting protector which utilizes an electronic and thermal feedback principle for achieving precise and rapid release of the protector, which can be readily reset. The principle ...  
WO/1994/000901A1
An overtemperature sensing and signaling circuit for electronic trip units includes a voltage divider (16) and a trigger circuit (18). The voltage divider is formed of a first resistor (R1) and a positive coefficient resistor (PT1). The ...  
WO/1993/010586A1
A personnel protection system for electrical connections is disclosed, which is of the type that differentially senses the current flow between the power lead (50) and the return lead (52) (or between two power loads) is provided with an...  
WO/1993/001640A1
An electrical appliance (1) is protected against overheating by the provision of a plurality of series-connected, auto-reset type thermal cut-outs (2) each located in the appliance in the region of a potential hot-spot, and by the provis...  
WO1992013379A3  
WO/1992/013379A2
Security and electric protection systems. Basically, they are comprised of electronic circuits for measuring and/or comparing and/or actuating. One of those systems detects the short-circuit and neutralizes it. Another of those systems a...  
WO/1992/010032A1
A temperature-control system includes an integrated circuit (14) and a sequence controller (12) therefore, wherein the sequence controller (12) provides instructions and/or data to the integrated circuit (14) which performs operations ac...  
WO/1992/009129A1
An electrical safety device acting as a contact potential limiter and combined with a current limiter via a differential relay (49) controlling a device for cutting off the electrical supply (1) whenever critical current and fault voltag...  
WO/1992/002064A1
A sensing conductor (62) and a detection circuit (59, 60, 61, 63) cause a low resistance shorting of an appliance circuit (57, 58) in response to immersion in water or other electrically conductive liquid, and an interrupter device (4, 5...  
WO/1991/020116A1
A deliberately undersized power conditioner circuit (35) for high peak power, low duty cycle equipment (31). The circuit may be connected with a thermal switch (54) to shut off the power if the transformer (36) gets too hot. The transfor...  
WO/1991/017596A1
A loss of neutral or ground protection circuit is disclosed which uses a simple capacitive circuit (C2, C6) which discharges through the neutral (3) or ground leads (4) in normal conditions, and in the event of loss of neutral or ground ...  
WO/1990/009693A1
A safety device for minimizing electrical shock to a user is taught. Briefly stated, a ground plane (30) is disposed inside an electrical tool (10) or device. Should the tool (10) become immersed in water or become unreasonably wet, the ...  
WO/1990/009694A1
A protection device (1, 10) for connection between an electrical supply and electrical apparatus includes a circuit breaker to interrupt the supply when an open neutral or live conductor is detected. The protection device includes means ...  
WO/1990/008947A1
An apparatus for detecting an abnormal temperature of a regenerative resistor which dissipates the regenerative energy of an electric motor. This apparatus has a heat conductive member (11) provided in contact with the surface of a regen...  
WO/1990/004870A1
The invention confers protection against electrocution in the bath on electric heating appliances such as hair dryers and fan heaters, in particular in connection with a suitable circuit breaker. The heating appliance is switched off by ...  
WO/1989/011747A1
An electrical safety apparatus arranged to be connected between an electrical power source and a load to provide protection against electric shock due to, for example, the insertion of probes or needles into a potentially live socket by ...  
WO/1989/011174A1
Facade heating of a building is provided by mounting a polymeric self-regulating heater (12) within the framework surrounding the glass panels. An electronic earth leakage current breaker (2) is used with the heater (12) and can be subje...  
WO/1989/008300A1
An apparatus for supervising objects, such as hot plates and electrical stoves, with regard to overheating comprises at least one detector (9) for detecting conditions of overheating and a device (11) controlled by the detector for deliv...  
WO/1989/006873A1
A circuit is provided to protect a liquid-filled electrical power transformer (10) from damage due to an internal fault which causes a rapid rise in pressure. A pressure transmitter assembly (12) converts the internal pressure of the tra...  
WO/1989/005050A1
A protective device for electrical mains appliances, in particular hand appliances connected by a cable (8) to a connecting plug or similar, comprises in the region of the connecting plug a protective switch (16) which can be actuated by...  
WO/1989/001718A1
A protective switching device for electrical appliances, in particular household appliances, has at least two current-carrying leads (L1', L2') and a spring-loaded switch (6) which can be switched off by a remote-controlled trip element ...  
WO/1988/010019A1
The electrical circuit breaker serves as a protective measure, in particular against electrocution in the bath in the event of a hairdryer falling into a bathtub filled with water. The circuit breaker operates very simply on alternating ...  
WO/1988/006813A1
An immersion detector circuit interrupter (38) having a sensor (22) located around the electrical components of an appliance (10) and switches (44) for interrupting the delivery of alternating current to the appliance (10) whenever the s...  
WO/1988/005974A1
In order to provide equipment with fail-safe characteristics in the event of accidents or failures that could disable the protective device of electrically driven, in particular portable apparatuses with a movable mains connection line a...  
WO/1988/004488A1
A method and system for electronically simulating, indicating and controlling the temperature of liquid cooled multi-phase electric power transformers. The temperatures of transformer windings are electronically computed from the actual ...  
WO/1988/000405A1
The system described operates in a very simple manner during a.c. operation and is particularly suited for providing protection against danger. A bistable relay (1, 5, 6) is used as the cut-off device, said relay drawing the power requir...  
WO1987001902A3  
WO/1987/002835A1
A device for protecting against excess current comprises a positive temperature coefficient (PTC) device and a tension spring connected by a solder joint adjacent the PTC device. Electrical current passes in series through the spring and...  
WO/1987/001902A2
A protective circuit for electrical apparatus has an insulated safety line (4) extending from the relevant electrical apparatus (6) to the protective circuit (2). The safety line (4) has inside the apparatus (6) at least one non-insulate...  
WO/1986/006920A1
An electrical heating pad, in particular a mattress to be laid under a patient during surgery, comprising a number of partially overlapping resistor elements (11-18). The foil elements cover different regions of the pad and are positione...  
WO/1986/002500A1
A method and a device for detection of an electric load (9) for the purpose of allowance of its connection to a power voltage from an electric voltage source over electric conductor means (7, 8). They are normally kept free from power vo...  
WO/1986/001299A1
Circuit for continuously controlling the grounding resistance of electric apparatuses of which the electrically conducting components susceptible of being touched, such as the casing, are connected by a grounding wire to a ground potenti...  
WO/1986/000179A1
Overheating alarm for surveillance of heat emitting objects, preferably intended for surveillance of hotplates and electric cookers. Emitted heat radiation from a monitored object is detected by an IR-detector, located at a distance from...  
WO/1985/002724A1
New device for protecting human life and property against electrical shock and more specifically to a shock hazard prevention system for disconnecting an electrical load from an electrical source when a shock hazard condition exists with...  
WO/1985/002744A1
In a two-way cable television (CATV) system, multiple subscriber address codes are provided during designated vertical blanking interval (VBI) lines of the video signal transmitted from the CATV headend to a plurality of system subscribe...  
WO/1983/003160A1
To protect the operator of an electrically supplied apparatus in a damp room against an electric discharge, there is provided a protection device comprised of a probe formed by two conductors (44, 45; 46, 47) which cannot come in contact...  
WO/1983/001138A1
A system for monitoring abnormally high temperature along the length of a heating conductor (H) includes a tracing cable (T) containing a heating conductor (H) and a monitoring conductor (M). The monitoring conductor (M) is connected to ...  
WO/1979/001033A1
Protection arrangement against a solicitation by suppression of the encapsulation (6), in switching devices encapsulated and insulated by pressure gas, distributed within individual sealed compartments. The arc is short-circuited for ext...  

Matches 501 - 550 out of 4,777