| 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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| 06/08/1989 | DE3740482A1 Circuit arrangement for monitoring a plurality of power outputs connected in parallel |
| 06/07/1989 | EP0319151A2 Circuit to prevent uncontrolled tripping of a protective relay |
| 06/07/1989 | CN2039068U Phase-failure protector |
| 06/07/1989 | CN2039067U Automatic electricity-saving protecting device for refrigerator |
| 06/07/1989 | CN2039066U Protector and alarm for limiting excess current or voltage |
| 06/07/1989 | CN2039064U Electromagnetic starter with leakage current protector |
| 06/06/1989 | US4837654 Control apparatus for three phase alternating current load protection |
| 06/06/1989 | US4837653 Quasi-power measurement circuit |
| 06/06/1989 | US4837520 Fuse status detection circuit |
| 06/06/1989 | US4837519 Fault detection |
| 06/01/1989 | WO1989005050A1 Protective device for electrical mains appliances, in particular manual appliances |
| 05/31/1989 | CN2038683U Alarming and protecting device for phase interruption of three-phase motor |
| 05/31/1989 | CN2038681U Overcurrent protector for electric apparatus |
| 05/31/1989 | CN2038680U Energy-saving and monitoring type socket for refrigerator |
| 05/30/1989 | US4835652 Bi-directional DC power controller with fault protection |
| 05/30/1989 | US4835651 Loss-of-potential supervision for a distance relay |
| 05/30/1989 | US4835649 Self-latching current limiter |
| 05/30/1989 | CA1254990A1 Redundant digital distance relay |
| 05/24/1989 | DE3837800A1 Circuit arrangement for monitoring the condition of fusible conductor connections |
| 05/24/1989 | CN2038292U Selective high-voltage leakage protecting device |
| 05/24/1989 | CN2038291U Leakage protecting switch for electric appliance |
| 05/24/1989 | CN2038290U Leakage safety protecting apparatus |
| 05/24/1989 | CN2038242U Anti-stealing electricity-theft-proof and over current protector in electric meter |
| 05/24/1989 | CN2038241U Electricity theft-proof auto-controller for electric meter |
| 05/23/1989 | US4833564 Current sensing relay circuit with adjustable sensitivity and tracking test circuit |
| 05/23/1989 | US4833563 Molded case circuit breaker actuator-accessory module |
| 05/23/1989 | US4833377 Current leakage reduction circuit |
| 05/17/1989 | EP0316204A2 Protective relay |
| 05/17/1989 | EP0316203A2 Protective relay |
| 05/17/1989 | EP0316202A2 Selecting a faulty phase in a multi-phase electrical power system |
| 05/17/1989 | CN2037885U Complete motor protector |
| 05/17/1989 | CN2037884U Multifunctional fully-automatic domestic electric protector |
| 05/17/1989 | CN2037883U Overcurrent protector |
| 05/16/1989 | US4831509 Door operation control apparatus |
| 05/16/1989 | US4831483 Abnormality detection alarm circuit for output circuit |
| 05/16/1989 | US4831406 Power circuit for camera |
| 05/16/1989 | EP0299060A4 High impedance fault analyzer in electric power distribution. |
| 05/10/1989 | EP0314683A1 Circuit protector |
| 05/10/1989 | CN2037506U Electric leakage protector |
| 05/10/1989 | CN2037505U Controlled silicon current limiter |
| 05/10/1989 | CN2037450U Fully automatic boiling water heater with unremittance by gas |
| 05/05/1989 | WO1989004077A1 Apparatus for detecting malfunctions of an electrical device |
| 05/05/1989 | WO1989004030A1 Polyphase circuit fuse condition indicating device |
| 05/03/1989 | DE3807935A1 Selective residual current device |
| 05/03/1989 | DE3807934A1 Selective residual current device |
| 05/03/1989 | CN2037117U Energy saving safety power supply switch |
| 05/03/1989 | CN2037116U Over-voltage automatic cutoff switch |
| 05/03/1989 | CN2037115U Highly reliable protector for household refrigerator |
| 05/03/1989 | CN2037113U Microcomputer multifunctional electric power quantity limiter |
| 05/02/1989 | US4827450 Integrated circuit with memory comprising a fraud-prevention device |
| 05/02/1989 | US4827369 Circuit interrupter apparatus with a selectable display means |
| 04/27/1989 | DE3735012A1 Overvoltage protection circuit |
| 04/26/1989 | EP0313422A1 Static tripping device for a circuit breaker in a cast case |
| 04/26/1989 | EP0313320A2 Safety apparatus for electrical power supply cables |
| 04/26/1989 | CN2036713U Quickly charging arrangement |
| 04/25/1989 | US4825350 Method and apparatus for detecting a reduction in the input voltage to a power supply |
| 04/25/1989 | US4825330 Ultra-fast solid state power interrupter |
| 04/25/1989 | US4825329 Earth leakage circuit breaker with plug actuated resetting breaker |
| 04/25/1989 | US4825328 Three phase electrical load protection device |
| 04/25/1989 | US4825327 Negative and zero sequence directional overcurrent unit for AC power transmission line protection |
| 04/25/1989 | US4825326 Digital calculation type differential relay |
| 04/25/1989 | US4825323 For detecting power swings |
| 04/20/1989 | DE3816957A1 Circuit arrangement with a plurality of shunts for the generation of voltages proportional to currents |
| 04/19/1989 | EP0311825A1 Frequency relay |
| 04/19/1989 | EP0311649A1 Add-on ground fault module. |
| 04/19/1989 | CN2036334U Adjustable protector for electric warming mattress |
| 04/19/1989 | CN2036326U Coal isolation mine illuminating comprehensive protecting switch |
| 04/19/1989 | CN2036323U Combined speedy electricity leakage protector |
| 04/19/1989 | CN2036322U Broken phase automatic protection blade switch |
| 04/19/1989 | CN2036321U Over electric voltage protector |
| 04/19/1989 | CN2036320U Comprehensive protection electricity saving controller for household refrigerator |
| 04/19/1989 | CN2036319U Automic protector for refrigerator with electric voltage display |
| 04/19/1989 | CN2036318U Electric quantitative loader for middle and small power |
| 04/19/1989 | CN2036276U Electric load capacity monitor |
| 04/18/1989 | US4823227 Three-phase monitor circuitry |
| 04/18/1989 | US4823226 Phase loss detection circuit including transient protection |
| 04/18/1989 | US4823021 Circuit for detecting on/off states of switches |
| 04/13/1989 | DE3733088A1 Overcurrent protection device for a load in a motor vehicle |
| 04/12/1989 | EP0311251A2 Apparatus and method for secure digital communication |
| 04/12/1989 | EP0310798A2 Shock harzard protection system |
| 04/12/1989 | CN2035926U Safety protector of shock, current leakage and overvaltage |
| 04/11/1989 | US4821137 Positive sequence distance relay for AC power transmission line protection |
| 04/06/1989 | DE3731543A1 Method and arrangement for monitoring phase failures |
| 04/05/1989 | CN2035541U Phase-losing protector for three phase power |
| 04/05/1989 | CN2035540U Single phase power batcher |
| 04/05/1989 | CN1032270A Voltage protector of refrigerator |
| 04/04/1989 | US4819125 Overcurrent detector |
| 04/04/1989 | US4819124 Overcurrent detector and circuit breaker |
| 04/04/1989 | US4819119 Faulted phase selector for single pole tripping and reclosing schemes |
| 04/04/1989 | US4819117 Method and apparatus for detecting excessive current draw in an electrical load |
| 04/04/1989 | CA1252022A1 Clutch control system for a continuously variable transmission |
| 03/29/1989 | EP0157881B1 Current detecting circuit |
| 03/29/1989 | CN2035153U Electrostatic-induction type fault-protector for high-voltage switch |
| 03/29/1989 | CN2035152U Safe electric controller for rationing power |
| 03/29/1989 | CN2035151U Safety for electric heating blanket |
| 03/29/1989 | CN2035150U Current-limiter |
| 03/28/1989 | US4816957 Self)test circuit for simulating ground line fault condition |
| 03/28/1989 | US4816956 Stray voltage reduction apparatus |
| 03/28/1989 | CA1251843A1 Door or gate obstruction control |
| 03/23/1989 | WO1989002666A1 Phase loss detection circuit including transient protection |