| 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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| 01/31/1978 | US4071822 Digital voltage detecting circuit for a power source |
| 01/17/1978 | US4068669 Stimulator fault protection circuit |
| 01/10/1978 | US4068283 Circuit breaker solid state trip unit incorporating trip indicating circuit |
| 01/10/1978 | US4068280 Automatic circuit restoration device for polyphase feed lines |
| 01/10/1978 | US4068276 Protective system for electrical appliances |
| 01/10/1978 | US4068275 Ground fault protective apparatus and method |
| 01/03/1978 | US4067054 Over-voltage protection |
| 01/03/1978 | US4067053 Active symmetrical component sequence filter |
| 12/27/1977 | US4065803 Electronic device for preventing undesirable effect resulting from voltage fluctuation |
| 12/27/1977 | US4065676 Battery backup for AC powered DC supply |
| 12/20/1977 | US4064546 Protection circuits |
| 12/20/1977 | US4064485 Digital load control circuit and method for power monitoring and limiting system |
| 12/13/1977 | US4063302 Protection arrangement for an inverter |
| 12/13/1977 | US4063300 Protective relay arrangements |
| 12/13/1977 | US4063299 Magnetically latched ground fault circuit interrupter |
| 12/13/1977 | US4063164 Method and apparatus for detection of short circuits by phase monitoring traveling wave signals |
| 11/29/1977 | US4060844 Solid state tripping circuit |
| 11/29/1977 | US4060843 Protection circuit for multiple phase power systems |
| 11/29/1977 | US4060709 Power supply control |
| 11/15/1977 | US4058757 Well pump-off controller |
| 11/08/1977 | US4057841 Unsupervised trip keying for phase comparison relaying apparatus |
| 11/01/1977 | US4056839 Protective relay devices |
| 11/01/1977 | US4056837 Ground fault circuit interrupter with trip level adjustment |
| 10/18/1977 | US4054934 Solid state inverse overcurrent relay |
| 10/18/1977 | US4054933 Saturating time-delay transformer for overcurrent protection |
| 10/18/1977 | US4054932 Over-current protective apparatus for a power circuit |
| 10/18/1977 | US4054898 Switching system to short-circuit a load with minimum residual voltage |
| 10/11/1977 | US4053940 Modified offset keying apparatus for phase comparison relaying |
| 10/11/1977 | US4053876 Alarm system for warning of unbalance or failure of one or more phases of a multi-phase high-current load |
| 10/11/1977 | US4053815 Ground fault interrupters |
| 10/04/1977 | US4052751 Ground fault interrupter circuit |
| 09/27/1977 | US4051544 Fail-safe ground fault receptacle circuit |
| 09/20/1977 | US4050091 Manually-controlled pneumatically-actuated electric motor starter system |
| 09/13/1977 | US4048666 Electric safety switch circuitry |
| 09/13/1977 | US4048664 Protective circuit for dynamic braking resistors |
| 09/13/1977 | US4048663 Solid state overload relay transformer circuit |
| 09/06/1977 | US4047235 Current limit and overcurrent cut off system |
| 09/06/1977 | US4047233 Short circuit protection circuit |
| 09/06/1977 | US4047079 Ground leakage current protection system |
| 08/30/1977 | US4045822 Ground fault interrupter apparatus |
| 08/30/1977 | US4045742 High voltage shutdown circuit responsive to excessive beam current and high voltage |
| 08/30/1977 | US4045732 Device for sensing the operative status of electrical equipment |
| 08/30/1977 | US4045714 Remote switch control and status indicator system |
| 08/23/1977 | US4044395 Ground fault protection system |
| 08/23/1977 | US4044295 Over-voltage interrupt for a phase controlled regulator |
| 08/23/1977 | US4044224 Protective circuit for dishwasher heating element |
| 08/16/1977 | US4042967 Ground fault sensor |
| 08/09/1977 | US4041540 Solid state overload relay circuit |
| 08/02/1977 | US4040116 Power supply employing a short circuit detector |
| 08/02/1977 | US4039932 Fault indicator testing apparatus |
| 07/26/1977 | US4038695 Static trip unit for circuit protective devices |
| 07/26/1977 | US4038061 Air conditioner control |
| 07/19/1977 | US4037265 Arc preventing power supply system |
| 07/19/1977 | US4037155 Current-responsive threshold detection circuitry |
| 07/12/1977 | US4035603 Fault detector system for starting plasma arc working apparatus |
| 07/05/1977 | US4034269 Protective relay circuits |
| 07/05/1977 | US4034268 Speaker protection circuit |
| 07/05/1977 | US4034267 Indicating apparatus |
| 07/05/1977 | US4034185 Electric blanket control circuit |
| 06/28/1977 | US4032988 Compressed gas filled circuit breaker |
| 06/21/1977 | US4031464 Line power distortion detector |
| 06/21/1977 | US4031463 Power brown-out detector |
| 06/21/1977 | US4031461 Source related potential indicating continuity tester |
| 06/21/1977 | US4031431 Ground fault circuit interrupter |
| 06/14/1977 | US4030039 Function generator |
| 05/31/1977 | US4027204 Phase failure detection circuit for multi-phase systems |
| 05/31/1977 | US4027203 Protective switch device for electrical distribution systems |
| 05/31/1977 | US4027202 Voltage protection circuit |
| 05/24/1977 | US4025823 Circuit breaker including undervoltage release mechanism and control circuit |
| 05/17/1977 | US4024439 Protection of polyphase equipment |
| 05/17/1977 | US4024438 Delta phase loss detector |
| 05/17/1977 | US4024436 Ground fault protective circuitry |
| 05/17/1977 | US4024435 Ground fault protective systems with variable rate integration of fault signals |
| 05/10/1977 | US4023153 Device for indicating any wire breaking in parallel connected plural loads |
| 05/10/1977 | US4023075 Inductorless symmetrical component sequence analyzer |
| 05/10/1977 | US4023072 Electrical protection means and method |
| 05/10/1977 | US4022598 Air conditioning |
| 05/03/1977 | US4021729 Cross-field ground fault sensor |
| 05/03/1977 | US4021704 Phase sequence correcting system for three-phase AC power |
| 05/03/1977 | US4021703 Phase imbalance detection circuit |
| 05/03/1977 | US4021700 Digital logic control system for three-phase submersible pump motor |
| 04/26/1977 | US4020396 Time division multiplex system for a segregated phase comparison relay system |
| 04/26/1977 | US4020395 Transient voltage protection circuit for a DC power supply |
| 04/26/1977 | US4020394 Ground fault detector |
| 04/19/1977 | US4019097 Circuit breaker with solid state passive overcurrent sensing device |
| 04/19/1977 | US4019096 Current limiting apparatus |
| 04/12/1977 | US4017781 D.C. voltage converter |
| 04/12/1977 | US4017766 Inverse time-overcurrent relay using successive linear approximations |
| 04/12/1977 | US4017765 Short circuit protected electronic control system |
| 04/05/1977 | US4016518 Circuit breaker with improved single coil actuator and undervoltage release mechanism |
| 04/05/1977 | US4016460 Electronic protection for power amplifier |
| 04/05/1977 | US4016458 Radio frequency distribution network standby power system with overvoltage protection |
| 03/29/1977 | US4015171 Resettable overcurrent-protected direct current power supply |
| 03/29/1977 | US4015169 Two pole ground fault circuit interrupter with improved rectified supply and transient suppression for a trip circuit |
| 03/22/1977 | US4013929 Multiple duty components of a ground fault receptacle |
| 03/15/1977 | US4012669 Electronic overload detecting device |
| 03/15/1977 | US4012668 Ground fault and neutral fault detection circuit |
| 03/08/1977 | US4011484 Undervoltage release with electrical reset for circuit breaker |
| 03/01/1977 | US4010457 Overload protection device |
| 03/01/1977 | US4010402 Load protective circuit |