Liquid crystal type device for measuring optoelectric voltage
ITRM920544D0
Device for allowing operations of opening and closing isolating switches, circuit breakers, and electrical line connectors in general
ITRM910717D0
Electronic device for executing the product of two quantities and the numerical integration
ITRM910269D0
Electrical protection device for alternating current and with limited power absorption, operating by detecting the earth resistance with elimination of the interference due to any voltage between earth and neutral
IT9048276D0
Device for decoupling differential protection means from electrical protection means of an alternating-current system which operate by means of detection of the electrical earth resistance and with a reduced power consumption
IT9047585D0
A remote transmission device for controlling user equipment by adopting circuit-parameter differentiation techniques
IT8948534D0
AC electric protector used in very low value recovery of earth resistance with limited power absorption.
IT8848040D0
SAFETY DEVICE FOR EARTH CURRENT DETECTION AND SAFETY ELECTRICAL PLUG EQUIPPED WITH SUCH DEVICE