![]() ![]() As per the circuit diagram shown, the connections are made. The required components to make this circuit mainly include an SPDT toggle switch, a 12V battery, a motor, and a lamp. This switch is mainly used in the three-way circuit to control an electrical appliance from two locations. Here from two outputs, one output is obtained from COM & A whereas the second output is obtained from COM & B but at a time one output only. We know that an SPDT toggle switch is a three-terminal device that includes single input & two outputs. Toggle switches are very common components within different electronic circuits. So this switch works like a simple ON/OFF switch within a circuit. In many electronic circuits, the toggle switch plays an essential role. Once the MBB switch is activated, first it will connect to the normally open circuit, after that it will detach from the normally closed circuit. In the MBB SPDT switch, the pole is connected to the NC throw circuit by default & detached from the normally open throw circuit. Once the BBM switch is activated, first it will separate from the NC circuit & after that, it will connect to the normally open circuit. In BBM SPDT switch, the pole is connected by default to the normally closed throw circuit & detached from the normally open throw circuit. The single pole double throw switch can be divided into two types based on the way of operating like BBM type switch (Break Before Make) & the MBB type switch (Make Before Break). Similarly, once the switch is opened, then two terminals will not be connected, thus the current does not supply. Once the switch is closed, then two terminals will be connected, so current supplies in between them. It is a simple ON/OFF switch, used to connect or disconnect two terminals. Usually, this switch is used in some special applications like switching two dissimilar power supplies in reverse conditions. If one of the outputs of this switch doesn’t connect to any circuit then the switch works like an SPST switch. This switch includes five terminals like two inputs and three outputs where two terminals are connected to the loads & one terminal is connected to the common terminal. The common connection allows the flow of current to make the circuit either with the normally closed (NC) or the normally open (NO) contacts. Similarly, the switch is known as NC switch or N/C switch, The Common If the pole is connected to the throw by default then it is called an NC circuit or normally closed circuit. Similarly, the switch is known as the NO switch or N/O switch. ![]() ![]() If the pole is detached from the throw circuit by default then the circuit is called a NO circuit or N/O circuit. SPDT has three connections which are normally open, normally close & common. ![]()
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