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(en )
1984-04-10
Solid state trip circuit with digital timer
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1976-08-10
Polyphase fault current flow detecting and resetting means
US3736468A
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1973-05-29
Ground fault interrupter apparatus
US5095398A
(en )
1992-03-10
Electrical circuit breaker protection device
US3188427A
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1965-06-08
Electromagnetic current carrying switch
US3967169A
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1976-06-29
Switching device for the protection of direct current devices
US3202875A
(en )
1965-08-24
Protective relay system
US2929963A
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1960-03-22
Protective relaying system for direct current equipment
PL66732B1
(enrdf_load_stackoverflow )
1972-08-31
US3723818A
(en )
1973-03-27
Direct acting overcurrent system for high voltage circuit breakers
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(en )
1971-05-18
Electrical ground fault detector with transformer coupling, a battery supply source and battery charging means
US3302061A
(en )
1967-01-31
Circuit breaker with undervoltage relay in series with motor control overload relay and plug-in base
US3296495A
(en )
1967-01-03
Polyphase protective relay circuits
CA1101533A
(en )
1981-05-19
Ground fault system with noise immunity
ES8201736A1
(es )
1981-12-16
Dispositivo de medida de una magnitud en una red de distri- bucion electrica alterna polifasica
US3313982A
(en )
1967-04-11
Magnetic current zero sensing circuit
US2965810A
(en )
1960-12-20
Circuit breaker trip circuits
US2883622A
(en )
1959-04-21
Alternating-current responsive devices
US3710190A
(en )
1973-01-09
Fault current protective circuit for a load supplied from single or polyphase systems
US4249151A
(en )
1981-02-03
Apparatus for variably adjusting a magnetic level with a translating spring force
US2345160A
(en )
1944-03-28
Through-current pilot-generator or regulator
GB1309820A
(en )
1973-03-14
Gatecontrolled phase failure protection circuit
US1979683A
(en )
1934-11-06
Switch structure
US1617377A
(en )
1927-02-15
Relay
SU756536A1
(ru )
1980-08-15
Устройство для защиты генератора переменного тока 1