COMPOSITE CIRCUIT-OPENING SAFETY DEVICE (ALTERNATIVES) Russian patent published in 2001 - IPC

FIELD: electrical engineering; automatic protection against electric shock and against abnormal characteristics of supply mains. SUBSTANCE: device has circuit breaker with independent-release coil, threshold element, power unit whose power leads are connected to one of phase conductors and to neutral conductor of supply mains, respectively, rectifier (alternative), and three resistors each being connected through one lead to respective phase conductor and other leads are interconnected (alternative); novelty is introduction of optocoupler, differential current sensor, two switches, five threshold elements, five resistors, OR gate, two monostable multivibrators, inertia section, two diodes, all specifically interconnected. EFFECT: improved reliability, enlarged functional capabilities of device. 3 cl, 8 dwg