PS27A Self-locking Switch Reset Switch Momentary Push Button Square Power Switch ON-OFF 2Pin 1A/250VAC 3A/125VAC

• A push button is a mechanical device that controls a circuit by pressing a button to activate an internal switching mechanism. Push buttons are often made of hard materials like plastic or metal, and are designed to be easily pressed. They are used in a variety of devices, including computers, telephones, and security systems.
• Momentary
  The most common type of push button, which is engaged or disengaged when the button is pressed.
• Normally closed
  Also known as a push-to-break switch, this type of push button interrupts the circuit when pressed.
• Normally open
  Also known as a push-to-make switch, this type of push button completes the circuit when pressed.
• Maintained
  This type of push button latches into one position until it is pressed again.