| 摘要 |
The electrical control appts. has a manual control (7) and automatic or manual control for opening the contact by an electromagnetic relay (4,4b) made up of a button for manual control and a contact inverter and/or interrupter in the closed position (T) through the relay coil. An additional element (3,3b,19,19b) is in series in the working contact (T) of the contact. An electronic circuit (6,6b) takes the feeder voltage from the additional element terminals and from the output voltage of the relay coil. This circuit has an analog or digital timer and is installed without modification in place of an inverter and/or interrupter in an existing installation. The additional element (3,3b) is a resistor element in combination with an electromagnetic relay and a timing circuit (6,6b) which together make an electronic control (9,9b) mounted with each inverter (1 or 1b) and functioning as a time-switch. It is possible to change the pure resistance by a resistance with negative temperature coefficient (NTC) correctly calibrated. USE - Manual and automatic control of public lighting utilities.
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