A push button switch, known in English as a push-button switch, is a device that uses a button to activate a mechanism that either opens or closes a circuit by bringing movable and stationary contacts together or apart. This simple yet versatile electrical component is widely used across various applications. Push button switches serve as primary electrical appliances in circuits, often used manually to send control signals to devices like contactors, relays, and electromagnetic starters in electrical automatic control systems.
Attached below is an image showcasing different models of push button switches, highlighting their diverse appearances and functionalities. These switches come in numerous varieties, including standard push buttons, mushroom-head types, self-locking, self-resetting, rotary handle, illuminated with indicators, symbol-lit, and even key-operated versions. They can be single, double, or triple-button designs, typically built using a modular design composed of a button cap, return spring, bridge contact, and housing. Most push button switches are composite units featuring one pair of normally closed and normally open contacts. Some models allow for additional contacts by connecting multiple units in series. There's also a unique self-holding version that stays locked in the closed position until power is cut off.
What exactly is a button switch? A push button switch can execute fundamental controls such as starting, stopping, reversing direction, shifting gears, and interlocking. Generally, each button switch includes two pairs of contacts, each comprising a normally open and normally closed contact. When pressed, these contacts act simultaneously—opening the normally closed contact while closing the normally open contact.
To ensure proper functionality and avoid accidental operations, button caps are often color-coded. Red is typically used for stop buttons, green for start buttons, and other colors like black, yellow, blue, and white may denote different functions. Detailed specifications, including the main parameters, types, mounting hole sizes, contact numbers, and current capacities, are outlined in the product manuals.
The model meaning of a push button switch can vary depending on its design and purpose. For instance, certain codes represent specific features such as open-type, protective, waterproof, anti-corrosive, explosion-proof, knob-type, key-type, emergency, self-sustaining, illuminated, combination, and interlocking switches. Each type serves distinct purposes and environments, catering to a variety of industrial and consumer needs.
Technically speaking, push button switches possess several parameters that define their performance and suitability for particular tasks. These include voltage ratings, current capacity, mechanical life cycles, operating temperature ranges, and environmental resistance. Below is a chart summarizing common technical specifications for push button switches.
Push button switches play a crucial role in modern electrical systems, offering reliable and efficient ways to manage circuits. Whether you're working in an industrial setting or a household environment, understanding the different types and their applications ensures optimal use and safety.
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