S821D/U

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When it comes to toggle switches, the S821D/U is a popular choice with its easy installation, low minimum order quantity and a wide range of contact configurations——ideal for commercial and industrial applications.

The S821D/U is a single-pole, double-throw toggle switch that provides a variety of connection options, including quick disconnect terminals, PCB terminals, and solder terminals. It includes an illuminated version, which provides a visual indication of an applied signal. The toggle switch is available in both panel and PCB mount, and the panel mount version comes with an optional lock-out feature.

The S821D/U\'s Contact configuration provides two independent circuits with a single common pole, allowing for a variety of applications. It is suitable for on-off switch applications, as well as situations in which two independent circuits are required. It can also be used as a latching switch, allowing the user to switch from one circuit to the other as needed.

The S821D/U\'s contact arrangement enables it to be used in applications that require higher current or voltage ratings. The contact surfaces are specially designed to ensure long life and reliable operation. Common applications of the S821D/U include industrial panels, stand-by power systems, stove and gas controls, automotive switches, water-tighter switches and industrial equipment.

The working principle of the S821D/U is based on a simple electromechanical mechanism. The toggle switch has a central, normally open (NO) pole and two fixed contacts (com and NC) which are controlled by a toggle lever. When the lever is in the upwards (on) position, the central pole is connected to the COM terminal, and when the lever is in the downwards (off) position, the central pole is connected to the NC terminal.

When an electric current passes through the terminals, a magnetic field is generated, which in turn causes the lever to move from one terminal to the other. This action opens and closes the NO pole and thus the switch is either ON or OFF, depending on the position of the lever. The switch is also designed to maintain its original position after the current is turned off.

The S821D/U also features multiple contact blocks to allow for multiple connections. The contact blocks are rated for use up to 7A at 125 Vac or 3A at 250 Vac. The S821D/U is housed in a plastic enclosure with a chrome-plated handle, which is suitable for indoor and outdoor applications. It is also available in several colors to match the application.

The S821D/U toggle switch is one of the most versatile and reliable switches available. With its wide range of features and connection options, it is suitable for a variety of applications requiring a heavy-duty, long-lasting switch. Its simple, yet effective working principle makes it a cost-effective and easy to install option for both residential and industrial purposed.

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