E68-30A

Snap action, limit switches, such as E68-30A, are devices used to make or break connections in circuits upon reaching predetermined conditions. The principle of operation of these switches is broadly similar, regardless of the specific make and model of the switch. It is based on the rapid snapping of movable contacts which, when released, electrically make or break the circuit.The electrodes in a snap action, limit switch are typically made of materials such as a metal alloy, iron, carbon, and plastics. Heat-treated metals are commonly used for the contact elements due to their superior strength and durability. The electrodes are insulated from each other to ensure that electrical energy does not pass between them.The construction of the device may vary, depending on the application for which it is intended. Generally, the device is a rectangular plastic box with a rectangular metal base. Inside the box are two plates, the contacts, and one or more springs that are used to drive the contacts into the closed or open position. The contacts are connected to a set of terminals at the top and bottom of the box. The terminals allow the connection and disconnection of an electrical circuit.The application of a snap action, limit switch is wide-reaching. It may be used to switch control circuits or amplify signals in automation processes. The switch may be used in the manufacturing process of food and light bulbs to precisely control the temperature during the manufacturing process to within millisecond accuracy. They are also commonly used in appliances and home electronics such as television sets, computers and washers & dryers. The limit switch also helps to control temperature and humidity to a pre-set maximum level.When it comes to the working principle of a snap action, limit switch, it basically uses a magnetic field to rapidly change the position of the contacts. In some switches, the movement of a plunger actuates a switch contact when the plunger reaches a certain distance. This motion triggers the reaction of the spring to quickly close or open the switch contact. In other switches, a special alloy bar is heated and cooled rapidly to initiate an ultra-fast contact snap.In conclusion, a snap action, limit switch has a wide range of application fields and is relatively simple in its construction and working principle. It is used to switch control circuits and amplify signals in automation processes, as well as being used to control temperature and humidity.