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A miniature ac relay is used daily in my house within the control circuit for its hot water and domestic central heating system.
For that reason I can confirm that a relay having a coil designed for continuous operation on alternating current will have a coil designed to operate without needing any diodes for rectification of the current supplied to its coil. (As no rectification is needed no capacitor is necessary for smoothing any resulting ripple.)
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The relay contacts should be wired in series with the appliance to be operated and the wiring kept well away from the coil. Don't forget to place a fuse in the contact circuit since the contacts can weld together if a fault develops. <><><> If you have a relay coil rated at say 110 volts it is usually necessary to supply it with a direct current. I would place a silicon diode in series with the coil to rectify the AC and allow the relay to operate. If it buzzes at 50 or 60 Hz you may need to use a bridge rectifier. (4 diodes encapsulated into a ring). If it still vibrates then you need to add a capacitor, rated at the proper voltage, across the coil.
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∙ 14y ago
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!! In india and most of the other countries user ac current. Hence, all the appliances are ac dependable. So generating ac directly would allow up to directly feed the appliances without any converter circuit.
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