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Snap action or "blade" switches, commonly known as limit switches, are popular electrical components used in a wide variety of applications. They consist of a body, usually plastic or metal, protected by a lever or "blade" actuated by a plunger, ball, or roller. The two most common types of limit switches are single-pole and double-pole, which differ in the number of contacts the switch has. Single-pole switches have one set of contacts while double-pole switches have two.

Limit switches are used in many industries and applications, including robotics and industrial automation. They are essential to the operation of most modern machinery, providing a feedback mechanism that signals when an input value has been exceeded. In robotics and automation, they are commonly used as sensors to detect and control the movement of a robot arm or other moving parts.

The working principle of limit switches is simple. When the actuating element (the plunger, ball, or roller) comes into contact with the switch, it causes the lever or blade to move and open or close the contacts. The switch remains in this state until the force is removed, typically by a return spring, which then causes the switch to reset. Limit switches allow automated systems to react to outside stimuli, such as physical contact, environmental conditions, or other external conditions.

Limit switches are extremely reliable, as they are designed to function in a range of temperatures, from -40°C to 125°C, and they are also highly resistant to dust and water. They can also be used in hazardous environments since they are monitored by an alarm system and can be hard-wired to the main control system.

In conclusion, snap action limit switches are an important component of robotics and industrial automation. They are easy to install, require minimal maintenance, and are highly reliable. They provide a feedback mechanism that signals when an input value has been exceeded and can be used in hazardous environments as they are monitored by an alarm system. These switches are essential to the operation of many modern machines, as they allow automated systems to properly react to outside stimuli.