Common Contact Types and Characteristics of Metal Push Button Switches

Normally closed contacts keep closed normally, disconnecting the circuit only when pressed, suitable for emergency stop systems with high reliability and anti-misoperation performance. Composite contacts integrate NO and NC functions; pressing the metal button disconnects NC contacts first and then closes NO contacts, realizing interlocking control.

They have versatile applicability but require precise structural design. These contact types ensure the metal push button switch meets different functional requirements, making the push button switch series, including the round push button switch, adaptable to various industrial and daily electronic scenarios.

The metal push button switch is widely used in industrial control and electronic equipment due to its excellent durability, which is mainly reflected in its strong resistance to mechanical wear and harsh environmental conditions such as high temperature, humidity and vibration.

Its contact type is a core component that directly determines its application scenario, as it affects the switch's switching logic, response speed and long-term operational reliability. Common contact types include normally open (NO), normally closed (NC), and composite contacts, each with distinct characteristics that make them suitable for different control requirements.

A push button switch's key function depends on precise internal contact conduction or disconnection, with different contact designs catering to diverse control requirements-from basic equipment on-off operations to complex automated production line interlocking. For example, the round push button switch, a popular push button switch variant, adopts these contact types to balance operational convenience and structural stability.

Its circular shape enables ergonomic, easy operation and compact installation, making it widely used in industrial device control panels. Normally open (NO) contacts, the most common type in daily and industrial use, are naturally open when unpressed. Pressing the button closes contacts to conduct the circuit and activate equipment; releasing it resets the switch and opens contacts via internal spring. Ideal for equipment start-up control, it features fast response, low power consumption and stable performance, ensuring accurate activation of motors, pumps and conveyors.