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Power supply's design and research for high voltage circuit of active ECT 5) Power- switching circuit: when the bleeder circuit normally worked, voltage valued 3v could be got and input to d. c. relay … Right angle tact switch with led The cover with light tact switch can be transparent or silver. Top subscription boxes – right to your door, © 1996-2020, Amazon.com, Inc. or its affiliates. 3. Electronics-Salon 3VDC Individual 4 Channel SPST-NO 5A/250V Power Relay Module. 3V Relay Power Switch Board, Icstation 1 Channel Optocoupler Module Opto Isolation High Level Trig… A Relay is an electrically operated switch. . . Also known as PLCs, these controllers combine the functionality of a relay, timer relay, and switch in one unit, so you can program complex automation jobs. . Get the latest deals on 3v Relays from leading brands. wholesale high quality 3v dc relay. The circuit below switches AC or DC power to a load using an ultra low power 3v latching relay with two coils. 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