Snap Action, Limit Switches

91MCE30-S5B switches are popular in a variety of applications that range from controlling lighting, HVAC systems and safety equipment. These switches rely on an actuator for restoring the internal parts of the switch to their original position. When the actuator is actuated, either by mechanical, electrical or magnetic action, the internal contacts of the switch “snap” open or closed. This type of switch is also known as a snapingly operated switch or a snap action switch.

Applications

91MCE30-S5B switches can be found in a variety of applications and processes that require precise control. Examples of these applications include floor level switches for elevators, industrial applications for controlling traffic, position sensing in robotics and automation, machine safety, HVAC systems, and power switching for appliances in the home. These switches are also popular for industrial process control applications.

Working Principle Behind Snap Action, Limit Switches

The 91MCE30-S5B is a snap action switch that relies on mechanical, electrical or magnetic actuation to restore the internal contacts of the switch when they are actuated. If a mechanical actuation is used, it is usually a spring-loaded plunger that is used to actuate the contact plates when the actuator is actuated. This results in a “snap” action that forces the contact plates open or closed, depending on the type of switch used.

If the switch uses an electrical actuation the switch is called either a mercury switch or a mercury contact switch. Mercury switches use a small load of mercury contained in a capsule that is present within the switch. When the actuator is pressed, the mercury is released into the switch and contacts the mercury contact plates, completing the circuit and actuating the switch.

Finally, if the switch uses a magnetic actuation it is said to be a reed switch. A reed switch uses a small conductor contained within a sealed glass tube. When the switch is actuated, either by physically pressing the actuator or by a controlled magnetic field, the conductor is exposed to the magnetic field, which in turn causes the contacts to be actuated.

Conclusion

The 91MCE30-S5B is a reliable, dependable and popular switch designed to provide precision control in a variety of applications. It is available in a wide range of form factors and switch types that allow it to be integrated into a variety of systems and processes that require precise control. As a snap action, limit switch, the 91MCE30-S5B is capable of providing reliable and robust operation for many years of trouble-free operation.