Patents
Sitemap › H02 - Generation, conversion, or distribution of electric power › H02H - Emergency protective circuit arrangements › 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
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)
11/1990
11/27/1990US4974112 Apparatus for improved protection against lower magnitude faults in an electrical power distribution system
11/22/1990EP0397711A1 Fault detection
11/22/1990CA2016886A1 Correction procedure of the phase difference introduced by a zero sequence measurement toroid of a leakage current and isolation monitor implementing this procedure
11/21/1990CN2066208U Three-phase four-wire system anti-stealing electricity and current-limiting device
11/21/1990CN2066207U Low-current drain alternating current overcurrent break device
11/21/1990CN2066140U Automatic control alarm watt-hour meter for limiting quantity of electricity and anti-stealing electricity
11/21/1990CN1047173A Protective device for phase-missing in phase sequence
11/21/1990CN1010537B Protective relaying apparatus for providing fault-resistance correction
11/21/1990CN1010526B Static trigger break of automatic switch for sampling and locking high peak valve signal
11/20/1990US4972290 Electric power system with remote monitoring and control of protective relays
11/20/1990US4972289 Electric motor control and protective assembly for fluid pump operation
11/20/1990US4972153 Apparatus for detecting a plurality of energy levels in a conductor
11/15/1990WO1990013934A1 Method and apparatus for monitoring an ac transmission line
11/14/1990EP0397017A2 Device for protecting semiconductor circuits against transients on the supply line
11/14/1990CN1047001A Fully-automatic protector for air conditioner (refrigerator)
11/14/1990CN1047000A Solid-state trip device for protective circuit breaker of three phase mains system, enabling type of fault to be detected
11/13/1990CA1276226C Voltage control module
11/07/1990EP0396477A1 Static trip device for a circuit breaker, protecting a three-phase network, allowing the detection of the fault-type
11/07/1990CN2065370U Three-phase circuit arrangement guarding against steeling electricity
11/07/1990CN2065369U Single-phase circuit arrangement guarding against steeling electricity
11/07/1990CN2065368U High-power automatic cut-out and reset controller
11/07/1990CN2065325U Multifunctional electric controller for single-phase electric meter
11/06/1990US4969062 Ground fault protection circuit
11/06/1990US4968960 Electromagnet relay with flux biasing
11/06/1990US4968944 Apparatus for detecting malfunctions of a single electrical device in a group of electrical devices, and methods of constructing and utilizing same
11/03/1990CA2015270A1 Solid-state trip device for a protective circuit breaker of a three-phase mains system, enabling the type of fault to be detected.
10/1990
10/31/1990EP0394509A1 Differential current circuit breaker and method for adjusting the trip ranges
10/31/1990EP0216894B1 Electronic fuse
10/31/1990DE3919950C1 Circuit for central and current monitoring - has collector-emitter path of transistor and loud coupled across DC supply
10/31/1990CN2064955U Three-phase motor multifunctional current leakage protector
10/31/1990CN2064954U On-column loaded oil switch with grounded protection device
10/31/1990CN2064953U Three-phase safety phase-failure protector
10/30/1990US4967304 Digital circuit interrupter with electric motor trip parameters
10/24/1990EP0393224A1 Circuitry for controlling the temperature of integrated power switching transistors in a semi-conductor circuit
10/24/1990CN2064551U Automatic protecting devices for pilferage and leakage of electricity
10/24/1990CN2064550U Electronic, multi-functioned protecting devices with ac (alternating current) three-phase system
10/24/1990CN1010152B Improved current fault detection method
10/23/1990US4965693 Electrical appliance with electrical hazard protection
10/23/1990US4965692 Overload detector and protection circuit
10/18/1990WO1990012438A1 Voltage-to-frequency squared circuit
10/17/1990EP0392733A2 Improvements relating to solid state electric switching arrangements
10/17/1990CN2064123U Auto-controlled fixed phase-sequence converter
10/17/1990CN2064122U Electrical appliance phase loss auto-protector for three-phase motor
10/17/1990CN2064121U Phase loss overload protector
10/17/1990CN2064120U Current limiter
10/17/1990CN2064119U Civil current limiter
10/17/1990CN2064118U Guantative power supply unit with overvoltage crowbar
10/16/1990CA1275319C Electronic reverse power relay
10/10/1990EP0391812A1 D.C. current network insulation monitoring system
10/10/1990EP0391143A2 Monitoring apparatus with switching device
10/10/1990EP0218648B1 Fault current protection circuit breaker
10/10/1990EP0152457B1 Control circuit for uninterruptible power supply
10/10/1990CN2063713U Power load controller
10/10/1990CN2063709U Practical integral protecting device for household electric appliances
10/10/1990CN2063708U Intelligence integral protective device for electric refrigerator
10/10/1990CN2063646U Energy-saving protective device
10/09/1990US4962350 Load condition detecting and driving system
10/06/1990CA2013145A1 Insulation monitoring system of a direct current power supply system
10/04/1990DE3917478C1 Energy storage earth leakage protection switch - has summation current transformer with trip circuit connected across its sec. winding
10/04/1990DE3906675A1 Heat switch
10/03/1990CN2063310U Three-phase three-wire apparatus for preventing electricity from being stolen
10/03/1990CN2063309U Multifunction protector for high-voltage electric leakage
10/03/1990CN2063308U Three-phase auto-protector for interruption
10/03/1990CN2063307U Common overvoltage protector
10/03/1990CN2063306U Multifunction protector for household electric appliances
10/03/1990CN2063305U Multifunction controller for using electric oven
10/03/1990CN2063304U Popular power-saving current limiter
10/03/1990CN1045864A On-spot tester for leakage protector
10/03/1990CN1045863A Tester for leakage protector
10/02/1990CA1274872A1 Circuit breaker with self-contained electronic trip actuator
09/1990
09/30/1990CA2011903A1 Voltage-to-frequency squared circuit
09/27/1990DE3909064A1 Mains isolator
09/26/1990CN2062913U Electric shock protector with automatic reset
09/26/1990CN2062912U Protector for over voltage, under voltage, overload, short-circuit and leakage
09/26/1990CN2062911U Fireproof alarm controller for tri-phase low-voltage power
09/26/1990CN2062910U Miniature protector for domestic electric appliances
09/26/1990CN2062909U Multifunctional protecting switch with indicator
09/26/1990CN2062908U Mutual-induction alarm and protector for circuit overload
09/26/1990CN1045666A Commutating distribution-difference type relay-protection part
09/26/1990CN1009786B Trip releaser with numerical solid state circuit auto-surveillance
09/26/1990CN1009785B Solid state instantaneous trip apparatus for current-limit circuit breaker
09/20/1990WO1990010968A1 Automatically resetting circuit protector
09/20/1990WO1990010967A1 Solid state circuit protector
09/19/1990EP0387837A2 Externally discernible power supply abnormality detection system
09/19/1990EP0387385A1 Earthing terminal cutoff relay
09/19/1990CN2062512U Three-phase ac ballance limit current protector
09/19/1990CN2062511U Contactless electric shock automatic safety device
09/19/1990CN2062510U Civil limit electricity and leakage safety device
09/19/1990CN2062453U Electric meter with limited current and anti-stealing electricity function
09/18/1990US4958252 Circuit breaker with rating plug having memory
09/18/1990US4958251 Guarded electronic circuit from reversal of its supply battery polarity
09/18/1990US4958250 Voltage isolation apparatus for service transformers
09/13/1990DE3907148A1 Fault-current circuit-breaker in combination with differential-current tripping mechanism
09/13/1990DE3907139A1 Circuit arrangement for controlling a DC motor
09/12/1990EP0387108A1 Eliminating the effects of voltage transients
09/12/1990CN2062124U Countertime limiting overcurrent relay
09/11/1990US4956743 Ground fault interrupters for glassy metal alloys
09/11/1990US4956741 Solid-state trip unit for DC circuit breakers
09/07/1990WO1990010332A1 Fail-safe and fault-tolerant alternating current output circuit
09/05/1990EP0385832A1 Electrical-overvoltage limitation arrangement
1 ... 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 ... 331