Reliable Switching

• Limit switches, also known as micro switches, use switching levers or other mechanisms that are activated, or tripped, via slight physical force. Limit switches are considered highly durable and reliable due to the tripping occurring through repeatable positions of the actuator, or the mechanical device used to control the switch. Limit switch actuation occurs via tipping-point mechanisms.
  
  

Tipping-Point Mechanism

• Tipping-point mechanisms contain two identical tipping points. When a switch control lever is tripped, the movement applies pressure to a spring, which pushes the contact actuator to the opposite point. This action releases the spring tension. Tipping-point mechanisms in limit switches ensure fast closing and opening of switch contacts. When the actuator force stops, the spring falls back to its original flat position.
  
  

Applications

• Limit switches are commonly found in safety switches used in vending machines and elevators. Limit switches are also used to detect paper jams in copier machines and are used in microwave ovens and door interlocks.