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Snap Action, Limit Switches

The 121EN188-R Limit Switch is a heavy duty industrial grade switch that has a wide range of applications in the manufacturing and industrial sectors. This type of switch is operated by a cam, lever, or plunger and is designed to activate a circuit when its contacts are acted upon by an external force. This device is commonly used for sensing movement, positions, or limits and is typically found on machine tool, heavy machinery, and other industrial applications.

Working Principle

The 121EN188-R Limit Switch operates based on the notion of a snap action, meaning it quickly makes and breaks a contact when an external force is applied. This switch is operated by either a roller plunger, cam, or lever and the external force can either be manually applied or created by another automated machine. When the plunger, cam, or lever is operated, a set of contacts is opened or closed, depending on the type of switch. When the contacts are open, they will not allow current to pass but when they are closed, current will flow and the circuit will be completed.

Application Fields

The 121EN188-R Limit Switch is widely used in the industrial and manufacturing sectors due to its versatile nature and durability. One common application for this type of switch is for controlling motor speed on machinery. For example, in a motor-driven machine the limit switch is used to either slow down or stop the motor when it reaches a preset limit. This helps safeguard the machine and its components from damage due to overloading or overheating. This type of switch is also used for controlling machines that require frequent reversing of motion, such as conveyor belts or indexing tables. Additionally, it is often used for detecting the position of machine parts, such as pistons, cams, and levers.

In addition to its use in manufacturing, the 121EN188-R Limit Switch is often found in safety applications. Examples of these include emergency stop switches on production lines and safety cut-outs in hazardous locations. These switches are generally used in conjunction with other safety devices such as pressure valves and light curtains in order to provide an additional layer of protection for personnel and machinery. This type of switch is also used in many home appliances such as stoves, microwaves, and dishwashers.

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