21AT3

Series:	AT
Part Status:	Obsolete

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Toggle Switches: 21AT3 application field and working principle

Toggle switches are a type of manually operated switch commonly used to control electrical devices. They feature a spring-loaded or lever-actuated switch, which is typically operated by a single mechanical action. Although toggle switches are less common than they once were, they are still found in a variety of applications including doorbells, lights, and automotive applications. The 21AT3 is one type of toggle switch with a unique construction and advantages that make it well-suited for certain applications. This article will explain the specifics of the 21AT3, including its application field and working principle.The 21AT3 is a single-pole, double-throw (SPDT) toggle switch manufactured by CW Engineering. It features a unique circuit design consisting of five contact points and a center “floating” fourth contact. This combination allows the 21AT3 to handle inductive, resistive, and capacitive loads without de-rating. Additionally, the switch has a rated life time of 5 million cycles and is designed to provide reliable operation even in harsh conditions.The 21AT3 is commonly used in a wide range of applications. It is particularly well-suited for use in automotive and HVAC systems, as its unique design allows it to effectively handle both heat and vibration. It is also used in many other electrical applications, including lighting and instrumentation.The 21AT3 works by establishing and breaking an electrical connection. The switch has two positions: ON and OFF. When the switch is in the ON position, current flows through the two contacts connected to the spring-loaded switch. When the switch is in the OFF position, current does not flow between these two contacts. The center “floating” fourth contact serves to ensure that the switch does not undesirably establish a connection between the two contacts when the switch is in the OFF position.In addition to its unique circuit design, the 21AT3 also has a number of other features that make it well-suited for certain applications. It is constructed with a corrosion-resistant base and sealed with a rubber boot to protect against moisture ingress. The switch also has a CR2032 battery backup system, which can be used in applications where a power outage or other interruptions might be a problem.The 21AT3 is a versatile toggle switch that is well-suited for a range of applications. Its unique design allows it to effectively handle both heat and vibration, making it ideal for automotive and HVAC systems. Additionally, the switch features a range of features such as a corrosion-resistant base and a battery backup system, which allow it to operate reliably even in harsh conditions.

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