Push button switches, commonly referred to as push-button switches in English, are mechanisms that use a button to push a transmission component, thereby opening or closing movable and stationary contacts to facilitate circuit switching. These switches are fundamental electric components with a straightforward design and broad applications.
In electrical automatic control circuits, they serve to manually transmit control signals to manage devices like contactors, relays, and electromagnetic starters.
There are numerous types of push button switches, which can be categorized into standard push types, mushroom head types, self-locking types, self-resetting types, rotary handle types, illuminated types with indicators, illuminated symbols, and key-operated types. They come in various configurations, including single, double, and triple button designs, typically constructed using a modular system comprising a button cap, return spring, bridge contact, and housing. These switches are often composite, featuring one pair of normally closed contacts and one pair of normally open contacts. Some models allow for an increased number of contacts by serially connecting multiple components. Additionally, there are self-holding buttons that automatically lock into the closed position upon activation and require power disconnection to reset.
A push button switch performs basic control functions such as starting, stopping, reversing, shifting, and interlocking. Typically, each switch has two pairs of contacts, each consisting of a normally open and a normally closed contact. When pressed, these contacts act simultaneously—opening the normally closed contact while closing the normally open contact.
To distinguish between functions and avoid accidental operations, button caps are usually color-coded. Common colors include red, green, black, yellow, blue, and white. For instance, red often signifies a stop button, while green indicates a start button. Detailed specifications, such as the main parameters, type, mounting hole size, number of contacts, and current capacity, are outlined in the product manual.
The model meaning of a push button switch can vary depending on its design and purpose, but it typically includes information about the switch's operational characteristics and compatibility.
Push button switches can also be classified based on their operational mode and protective features. Common types include open-type switches for insertion and fixation onto switchboards, protective switches with covers to shield internal components from damage, waterproof switches to prevent water ingress, anti-corrosive switches to resist chemical gas exposure, explosion-proof switches for hazardous environments, knob-type switches for manual rotation, key-operated switches for security against unauthorized access, emergency switches with large mushroom buttons, self-sustaining switches with electromagnetic mechanisms, illuminated switches with signal lights, combination switches, and interlocking switches.
Technical parameters for commonly used push button switches include factors like voltage rating, current capacity, contact resistance, and mechanical life. These details are often summarized in tabular form for easy reference.
Overall, push button switches play a crucial role in modern electrical systems, offering reliable and efficient ways to manage circuits across diverse applications.
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