| Patents for H01H 33 - High-tension or heavy-current switches with arc-extinguishing or arc-preventing means (18,584) |
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| 02/07/1978 | US4072832 Control electrode for high-voltage apparatus |
| 01/31/1978 | US4071727 Vacuum-type circuit interrupter with means for protecting its bellows against mechanical damage |
| 01/31/1978 | US4071461 Gaseous dielectric mixtures for suppressing carbon formation |
| 01/24/1978 | US4070558 High voltage circuit-interrupters |
| 01/17/1978 | US4069406 Closing resistor switch for gas insulated circuit breaker |
| 01/10/1978 | US4068108 Enclosed high voltage circuit breaker |
| 01/10/1978 | US4067925 Electric insulator |
| 01/10/1978 | US4067379 Impregnation with liquid copper |
| 12/20/1977 | US4064384 Arc electrode, especially for a contact arrangement in a vacuum switch |
| 12/20/1977 | US4064383 Vacuum circuit breaker with improved means for limiting overtravel of movable contact at end of opening stroke |
| 12/20/1977 | US4063991 Method of increasing voltage withstanding capability of vacuum interrupters |
| 12/13/1977 | US4063130 Low impedance electron-beam controlled discharge switching system |
| 12/13/1977 | US4063126 Vacuum arc discharge device with tapered rod electrodes |
| 12/13/1977 | US4063053 Adjusting and sealing means for high pressure gas storage tank |
| 12/06/1977 | US4061894 Vacuum-type circuit interrupter with improved protection for bellows |
| 11/22/1977 | US4059741 Puffer type gas circuit breaker |
| 11/08/1977 | US4057716 Circuit breaker trip and release type control mechanism |
| 11/01/1977 | US4056836 Method and apparatus for interrupting large current |
| 10/18/1977 | US4054933 Saturating time-delay transformer for overcurrent protection |
| 10/11/1977 | US4053727 Arc blow-out switch |
| 10/04/1977 | US4052577 Magnetically driven ring arc runner for circuit interrupter |
| 10/04/1977 | US4052576 Contact structure for SF6 arc spinner |
| 10/04/1977 | US4052575 Metal-clad gas-type high-power circuit-breaker constructions involving two arc-extinguishing assemblages |
| 10/04/1977 | US4052555 Gaseous dielectric compositions |
| 09/20/1977 | US4050091 Manually-controlled pneumatically-actuated electric motor starter system |
| 09/13/1977 | US4048457 Circuit-interrupter grid structure for an oil-break circuit interrupter |
| 09/13/1977 | US4048456 Puffer-type gas-blast circuit breaker |
| 09/13/1977 | US4048348 Method of applying a fused silica coating to a substrate |
| 09/06/1977 | US4046979 Arc quenching arrangement for a gas-flow type circuit breaker |
| 09/06/1977 | US4046978 Contact structure for puffer-type gas-blast circuit interrupter |
| 08/30/1977 | US4045633 Gas-blast electric circuit interrupter of the puffer type |
| 08/23/1977 | US4044211 Puffer-type compressed-gas circuit-interrupter |
| 08/23/1977 | US4044210 Fluid-blast circuit interrupter |
| 08/09/1977 | US4041356 Air-break circuit interrupter having magnetically-assisted arc-dividing electrodes |
| 08/09/1977 | US4041264 Operating device for a contact device for a pre-insertion resistor in a high-voltage circuit breaker |
| 08/09/1977 | US4041263 Electric circuit interrupter of the puffer type comprising a magnetically actuated piston |
| 08/09/1977 | US4041262 Contact arrangement for an electrical switch, especially for a vacuum switch |
| 08/09/1977 | US4041261 High current capacity rod array vacuum arc discharge device |
| 08/02/1977 | US4039983 High-speed high-current circuit interrupter having electrodynamically operated arcing contacts |
| 08/02/1977 | US4039792 Compact high-current vacuum circuit interrupter comprising a metal housing that is electrically connected to one contact of the interrupter |
| 07/19/1977 | US4037187 Metal clad insulating circuit breaker |
| 07/19/1977 | US4036058 Hot spot thermometer |
| 07/05/1977 | US4034264 Arrangement for detecting a deficient operational capability of a vacuum switching vessel |
| 07/05/1977 | US4034175 Protracted-blast electric circuit-breaker for alternating currents |
| 06/28/1977 | US4032988 Compressed gas filled circuit breaker |
| 06/28/1977 | US4032870 Electric circuit breaker with electromagnetic-assist means for opposing magnetic contact-separating forces |
| 06/28/1977 | US4032737 Contact system for high-voltage power circuit breakers |
| 06/28/1977 | US4032736 Gas-pressurized electrical switch with current-generated magnetic field for assisting arc extinction |
| 06/28/1977 | US4032301 Composite metal as a contact material for vacuum switches |
| 06/28/1977 | US4032207 High current electrical joint apparatus |
| 06/21/1977 | US4031346 Electrical interrupter switch |
| 06/14/1977 | US4030053 Distribution transformer secondary circuit breaker having cantilevered contacts |
| 06/14/1977 | US4029923 Magnetizing current switch |
| 06/14/1977 | US4029922 Operating device for enclosed high voltage circuit breakers |
| 06/14/1977 | US4029921 Vacuum-type circuit interrupter with two sets of contacts electrically in parallel |
| 06/14/1977 | US4029380 Grounded surface distribution apparatus |
| 06/07/1977 | US4028555 Power interrupt test equipment |
| 06/07/1977 | US4028514 High current vacuum circuit interrupter with beryllium contact |
| 05/31/1977 | US4027125 Gas insulated circuit breaker |
| 05/31/1977 | US4027124 Contact system for high-voltage power circuit breakers |
| 05/31/1977 | US4027123 Vacuum circuit breaker comprising series connected vacuum interrupters and capacitive voltage-distribution means |
| 05/31/1977 | US4026523 Hydraulic jacks |
| 05/17/1977 | US4024365 Compressed-gas multiphase circuit-breaker installation |
| 05/17/1977 | US4024363 Shorting contacts for closing a superconducting current path operated by a bellows arrangement responsive to the pressure of a cryogenic medium used in cooling the contacts |
| 05/03/1977 | US4021702 Arrangement for detecting deficient operational capability of vacuum switching vessels |
| 05/03/1977 | US4021699 Device for limiting currents |
| 05/03/1977 | US4021678 Automatic transfer switch |
| 05/03/1977 | US4021633 Persistent current switch including electrodes forming parallel conductive and superconductive paths |
| 05/03/1977 | US4021629 Arc electrode, especially for a contact arrangement in a vacuum switch |
| 05/03/1977 | US4021628 Vacuum fault current limiter |
| 05/03/1977 | US4021317 Method of operating an electrolytic cell |
| 04/26/1977 | US4020307 Compressed gas electrical switch with gas-tight housing |
| 04/26/1977 | US4020306 High voltage switching device with calcium-aluminum glass filled resin insulator support |
| 04/26/1977 | US4020304 Two-material vapor shield for vacuum-type circuit interrupter |
| 04/19/1977 | US4019008 Actuating mechanism for snap-actuating an electric switching apparatus |
| 04/19/1977 | US4019007 Grounded-tank high-power compressed-gas circuit-interrupter |
| 04/05/1977 | USRE29172 Voltage-dividing DC circuit breaker and method |
| 04/05/1977 | US4016385 High voltage transfer switch with cam controlled overlap during transfer |
| 04/05/1977 | US4016383 Sealing device for an assembly of elements of high-voltage cut-out devices |
| 03/29/1977 | US4015095 Contact arrangement for an electric compressed-gas circuit breaker |
| 03/29/1977 | US4014659 Impregnated compound metal as contact material for vacuum switches and method for its manufacture |
| 03/22/1977 | US4013853 Multi-phase compressed-gas circuit-breaker construction |
| 03/22/1977 | US4013852 Expulsion interruption device for high voltage switches |
| 03/15/1977 | US4012614 High-voltage circuit-interrupter having a closing resistance and improved shunting-resistance contacts therefor |
| 03/08/1977 | US4011426 Device with arc-extinguishing system |
| 03/08/1977 | US4011421 Gas-blast switch |
| 03/01/1977 | US4010338 Vacuum switch having axially disposed switching elements |
| 02/22/1977 | US4009458 Puffer type gas circuit breaker |
| 02/22/1977 | US4009358 Electric circuit-breaker for alternating currents |
| 02/08/1977 | US4007345 Indicating arrangement for indicating the condition of the switching contacts of a switching vessel in a vacuum-switch apparatus |
| 02/01/1977 | US4006332 Convection heating apparatus for multi-phase gas-type circuit interrupters |
| 02/01/1977 | US4006331 Vacuum interrupter for high voltage applications |
| 01/25/1977 | US4005345 Multi-phase gas-type circuit-interrupter substitution modular construction |
| 01/25/1977 | US4005340 Apparatus for the current limiting interruption of currents at high voltages |
| 01/25/1977 | US4005297 Vacuum-type circuit interrupters having heat-dissipating devices associated with the contact structures thereof |
| 01/18/1977 | US4004117 Arcing electrode, more particularly for vacuum switches |
| 01/18/1977 | US4004076 Nonconsumable electrode for melting metals and alloys |
| 01/11/1977 | US4002870 Arcing contact for a high current switch |
| 01/11/1977 | US4002867 Vacuum-type circuit interrupters with condensing shield at a fixed potential relative to the contacts |
| 01/11/1977 | US4002088 Clutch for a rotary switch drive shaft |