Smart Disconnect Switch

Operating Mode of a Smart Disconnect Switch

A single-family house contains several hundred meters of electrical cable. Circuits are fed from a central electrical panel board, where the AC voltage is 120 Volts (throughout North America). This system ensures that electrical energy is available at any time.

However, it is a well-known physical phenomenon that an alternating electrical current flowing through a conductor creates an electromagnetic field (EMF). Even when electronic appliances are switched off, a small EMF can be generated. The strength of such a field is lower than when the appliance is switched on but it may have an adverse effect on electro-sensitive people.

This problem can be solved by installing a smart disconnect switch. A smart disconnect switch is installed inside the electrical panel board and disconnects the voltage mechanically after all appliances are switched off. When an appliance is switched back on a signal voltage of 3 to 12 V reconnects the disconnect, providing power for the appliance. The prerequisite for the functioning of a smart disconnect is that no appliances on the circuit are switched on. AC operated clocks or clock radios as well as TVs or CD-players in stand-by mode should therefore not be connected to the respective circuit.

If particular rooms (e.g. bedrooms) are to be equipped with a smart disconnect switch this should be considered during construction and individual circuits with smart disconnect switches should be installed for those rooms.