I just wanted to send you a note and say thank you. Devices plugged into them can be scheduled to automatically turn off or on at designated times of day or night. Since almost any mains transformer can be used for example, I have some V transformers I could have used - they are no use to me in Australia for anything else. You would need to experiment with the current transformer loading to obtain acceptable sensitivity. It cannot and must not be accessible as an auxiliary supply, because it is permanently at a lethal voltage. The power supply is more or less as shown above. One thing that has been done properly is to incorporate a thermal fuse with the MOVs.
Advanced Power Strips in the Office
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I can only assume that there's a small leakage current through the MOVs even though the unit has never been used. In all cases, it is vitally important that the main relay RL1 is be rated for the full AC load current and voltage that you will be controlling. Computers, computer accessories, printers, TVs, fans, space heaters, task lighting, and other miscellaneous electronics in work-stations and offices. For low current mA or more , simply use 10 turns through the core to increase the sensitivity, and reduce the fuse from 10A to 2A or so. Small transformers are not often renowned for their build quality, and a labour saving circuit that burns down your house is not entirely satisfactory.
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J1 is only needed if an external supply is used, otherwise, it too can be omitted. I can only assume that there's a small leakage current through the MOVs even though the unit has never been used. This is because it will not be saturated, and the full voltage does not appear across the relay. Since almost any mains transformer can be used for example, I have some V transformers I could have used - they are no use to me in Australia for anything else. In this application, we don't really care if the current transformer saturates, and frequency response is unimportant.
Energy-saving Tier 2 advanced power strips have always-on and energy-saving outlets only. The transistor will have the relay current flowing through it, and some voltage across it - this equates to power, and power means heat. Since it's not always practical to unplug your devices or shut down power to all of them at once, "smart" power strips can effectively do so for you. Helping to Stop Idle Current Now! If the auxiliary DC is not required, C1 may be reduced to about uF which is still better than many transformer based plug pack supplies! So, if your 'master' load draws more than 1A or so, use the following circuit.