| Patents for H02H 3 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection (33,031) |
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| 03/06/1991 | CN2072738U Protecting unit for using electricity |
| 03/06/1991 | CN2072737U Multi-functional safety device for electric equipments |
| 03/06/1991 | CN2072736U High-accuracy current time type safety refrigerator circuit |
| 03/06/1991 | CN1049761A Method and apparatus for determining deterioration of electric power line |
| 03/01/1991 | WO1991003828A1 Processor controlled circuit breaker trip system having an intelligent rating plug |
| 03/01/1991 | WO1991003827A1 Microcomputer based electronic trip system for circuit breakers |
| 03/01/1991 | WO1991003826A1 Processor controlled circuit breaker trip system having reliable status display |
| 03/01/1991 | WO1991003825A1 Fault powered, processor controlled circuit breaker trip system having reliable tripping operation |
| 02/28/1991 | DE4026428A1 Arrangement for determining deteriorating properties of HV cable - uses sensors along cable enabling detection of maximum pulse amplitudes in null voltage signals |
| 02/28/1991 | DE3929236A1 Protection circuit for AC user current connection units - has measurement input connected at line to be monitored and comparator |
| 02/27/1991 | EP0235145B1 Device for supervision in non-directly earthed power systems |
| 02/27/1991 | CN2072288U Electrical apparatus starter with phase interruption protecting function |
| 02/27/1991 | CN2072287U Multifunctional protector for household electric appliances |
| 02/27/1991 | CN2072268U Integrated protector for household electric appliances |
| 02/27/1991 | CN1049576A Phase cut-off protector of phase and width discrimination |
| 02/26/1991 | US4996646 Tripping system |
| 02/26/1991 | US4996625 Power source unit for image recording apparatus |
| 02/26/1991 | US4996624 Fault location method for radial transmission and distribution systems |
| 02/21/1991 | WO1991002396A1 Adaptive trip fault current indicator |
| 02/20/1991 | CN2071836U Electric current controlled protective device for refrigerator |
| 02/20/1991 | CN2071835U Safety socket for domestic electric appliances |
| 02/20/1991 | CN2071834U Multifunction protective switch |
| 02/20/1991 | CN2071833U Zero-power dissipation safety power limiter |
| 02/19/1991 | US4994934 Microcomputer based reclosing relay |
| 02/19/1991 | US4994933 Ground fault circuit interrupter having loss of neutral or loss of ground protection |
| 02/19/1991 | US4994651 Solid state temperature dependent direct voltage interrupter for a heater circuit |
| 02/19/1991 | CA1280500C Low level voltage programmable logic control |
| 02/14/1991 | DE3925372A1 AC network overvoltage peak redn. by active switching - involves temporary opening of switch across rectifier bridge with inductance-capacitance suppression of additional load spikes |
| 02/13/1991 | CN2071400U Three-controlled logic high voltage leakage protector |
| 02/13/1991 | CN2071399U Three phase four cable anti-electricity stealing and anti-cable stealing combined device |
| 02/13/1991 | CN1011652B Protection arrangement for telephone subscriber line interface circuit |
| 02/12/1991 | US4992904 Hybrid contactor for DC airframe power supply |
| 02/12/1991 | US4992836 Device for controlling the electrical supply to a load, in a "smart" power integrated circuit |
| 02/12/1991 | CA1280160C Mains protection device |
| 02/08/1991 | WO1991002395A1 Current adaptive fault indicator |
| 02/08/1991 | CA2064834A1 Current adaptive fault indicator |
| 02/07/1991 | DE3925174A1 Overvoltage protection circuit for DC source and load - has thyristor switch, limiting inductance and comparator logic control for limiting current surge to reservoir capacitor during transient |
| 02/06/1991 | CN2070961U Leakage, interruption phase, overvoltage and overcurrent automatic circuit breaker |
| 02/06/1991 | CN2070959U Leakage switch with over-voltage protecting function |
| 02/06/1991 | CN2070958U Refrigerator protector |
| 02/06/1991 | CN2070957U Multifunctional control safety switch |
| 02/05/1991 | US4991105 Microprocessor controlled ground system monitor |
| 02/05/1991 | US4991052 Differential protective relay apparatus |
| 02/05/1991 | US4991042 Digital circuit interrupter with keypad data entry and display |
| 01/30/1991 | EP0410423A2 Multiple power supply system |
| 01/30/1991 | CN2070507U Intelligent power fixed quantity device |
| 01/30/1991 | CN2070506U Power cut-off self-reset switch |
| 01/30/1991 | CN1011454B Single-phase electric distribution equipment coming into room of user |
| 01/23/1991 | EP0409327A2 Power supply with DC-voltage monitoring circuit |
| 01/23/1991 | CN2070047U Multi-functional overload protector |
| 01/23/1991 | CN2070046U Multi-function circuit protecting switch for domestic electrical appliance |
| 01/23/1991 | CN2070041U Muti-function plug and socket-type protector for electrial appliances |
| 01/22/1991 | US4987512 Solid state circuit protector |
| 01/16/1991 | EP0407938A2 Circuit for protecting electrical equipment against overvoltage |
| 01/16/1991 | EP0276296A4 Current-limiting circuit |
| 01/16/1991 | CN2069624U Electricity-saving voltage-stabilized safety protector for refrigerator |
| 01/16/1991 | CN2069623U Overvoltage protective device for power user |
| 01/16/1991 | CN1048635A Solid-state trip unit for dc circuit breakers |
| 01/16/1991 | CN1048601A Excess current detecting device |
| 01/10/1991 | WO1991000634A1 Remote sensing power disconnect circuit |
| 01/09/1991 | EP0407310A1 Static trip unit with a desensibilisation system for earth protection |
| 01/09/1991 | EP0407105A2 Solid-state trip unit for DC circuit breakers |
| 01/08/1991 | US4984185 Portable computer having a battery voltage detecting circuit |
| 01/08/1991 | US4984124 Faulted current indicator with inrush restraint |
| 01/08/1991 | US4983955 Electric power supply circuit monitoring systems |
| 01/03/1991 | CA2019892A1 Solid - state trip unit for dc circuit breakers |
| 01/03/1991 | CA2019775A1 Static trip device comprising an earth protection desensitization system |
| 01/02/1991 | EP0404878A1 Transient suppressor |
| 01/01/1991 | US4982443 Instantaneous voltage drop detector for DC power source |
| 12/27/1990 | EP0404692A1 Protection device for a voltage source against short-circuits |
| 12/27/1990 | EP0404220A1 Device for protection against overvoltages of integrated electronic circuits, particularly for applications in the motor car field |
| 12/26/1990 | CN2068290U Multi-functional domestic leakage safety unit |
| 12/26/1990 | CN2068289U Miniature fully-automatic overvoltage protector |
| 12/26/1990 | CN2068288U Load-limiting, anti-stealing electricity and leakage protector |
| 12/25/1990 | US4980791 Universal power supply monitor circuit |
| 12/25/1990 | US4980790 Fault indicating means |
| 12/19/1990 | EP0402362A1 Electrical load shedding circuit |
| 12/19/1990 | CN2067873U Remote-control power-saving protector |
| 12/19/1990 | CN2067872U Overload sounder |
| 12/19/1990 | CN1010911B Arrangement for fault indication |
| 12/18/1990 | US4979072 Lamp output protective circuit in electronic controller |
| 12/18/1990 | US4979070 Automatic reset circuit for GFCI |
| 12/18/1990 | US4979068 High speed electronic circuit breaker |
| 12/18/1990 | US4979066 Loading controlling apparatus |
| 12/18/1990 | CA1278029C Apparatus and method for protecting an electrical circuit |
| 12/13/1990 | DE4017134A1 Plug-unit for switch=off monitoring esp. in HV power switch - has at least one evaluator output coupled to control relay for switch off circuit |
| 12/12/1990 | EP0401213A1 Protective device for electrical motors and networks and temperature stabilizer |
| 12/12/1990 | CN1047767A 漏电保安器 Leakage protector |
| 12/12/1990 | CN1047766A Inverse time-lay overcurrent relay |
| 12/11/1990 | US4977477 Short-circuit protected switched output circuit |
| 12/06/1990 | DE3921063C1 Detecting short to earth in non-earthed three=phase power supply - measuring and evaluating direct currents derived from voltages tapped from resistors assigned to each lead |
| 12/05/1990 | CN2066988U Fraudulent use protector for electricity |
| 12/04/1990 | US4975800 Contact abnormality detecting system |
| 12/04/1990 | US4975798 Voltage-clamped integrated circuit |
| 12/04/1990 | US4975797 Arrester with external isolator |
| 12/04/1990 | CA1277410C Control circuit for a circuit interrupter |
| 11/28/1990 | EP0399983A2 Emergency shutdown for industrial installation |
| 11/28/1990 | EP0399923A1 Method for correcting the phase error caused by measuring a fault current with a symmetric torridale core |
| 11/28/1990 | CN2066632U Central protecor for full automatic domestic electric appliance |
| 11/28/1990 | CN2066631U Protector for automatic current discontinuance of colour tv |