Basic function: By using a metal push rod to move or separate the moving/stationary contacts, the current can be controlled to turn on or off, and the circuit can be turned on or off. Its contact types include normally open (NO), normally closed (NC), and composite (NO+NC combination).
Reset function: It can be divided into self resetting and self-locking types. Release the self resetting button to reset and power off, such as the emergency stop button; The self-locking button is first pressed to lock power on, and then pressed again to unlock power off.
Function extension: Some metal button switches are equipped with LED indicator lights, which can achieve monochrome or multi-color display, and may also integrate buzzer feedback or symbol identification to enhance the interactive experience.
Working principle: Metal button switches work based on the physical contact between two metal components. When the button is pressed, the metal push rod moves the moving contact downwards and comes into contact with the stationary contact, thereby establishing a circuit connection and allowing current to flow through; When the button is released, the reset spring returns the push rod and the moving contact to their initial positions, separating the moving and stationary contacts and disconnecting the circuit.
application area
Industrial control: used for machine tool emergency stop buttons, PLC systems, etc., often requiring high protection levels such as IP67.
Transportation: such as car start buttons, rail transit control panels, etc.
Special scenarios: including medical disinfection equipment, explosion-proof environments (requiring Ex certification), military aerospace, etc.
Consumer electronics: such as high-end audio knobs, computer power buttons, etc.
advantage
Excellent performance: Using silver alloy contacts, it has strong oxidation resistance and long electrical life. For example, the Chint NPM8 series metal button switch has an electrical life of up to 50000 times. Its mechanical lifespan is also relatively long, with ordinary self resetting buttons capable of up to 1 million cycles.
Safe and reliable: The all stainless steel shell has a high anti-collision level, and the base is made of V0 level flame-retardant material. It can also achieve high protection levels, such as IP65, IP67, etc., which can effectively prevent dust and water.
Comfortable tactile sensation: It is usually designed with ergonomics, and the curved surface design makes the tactile sensation comfortable and the operation sensitive and accurate.
Good feedback performance: The switch force and stroke are small, and good tactile sensation and feedback can be obtained when the button is pressed.
selection
Select according to the usage scenario: In industrial control scenarios, it is necessary to choose button switches with high protection levels and long mechanical life; In the field of consumer electronics, attention can be paid to its appearance design and touch.
Select based on functional requirements: Determine the required contact type (normally open, normally closed, or composite), and whether functional extensions such as indicator lights and buzzers are needed.
Based on electrical parameter selection: Pay attention to electrical parameters such as rated operating voltage and rated current to ensure they match the circuit being used.
Choose based on brand and quality: Products from well-known brands are usually more guaranteed in terms of quality and after-sales service.
Nursing and Maintenance
Regular cleaning: Regularly check the buttons, remove dirt from them, and prevent dust, engine oil, and other debris from entering, causing insulation degradation or short circuit accidents.
Preventing high temperature effects: When used in high temperature environments, measures such as tightening the fixing ring or adding an insulated plastic tube at the wiring screw can be taken to prevent plastic deformation and aging from causing the button to loosen.
Pay attention to the use of indicator lights: For buttons with indicator lights, if the power is on for a long time, the voltage of the light bulb can be appropriately reduced to extend the service life of the light bulb and plastic lampshade.
Timely handling of poor contact: If poor contact is found, the cause should be identified, such as repairing the contact surface, cleaning the contact surface, replacing the contact spring, etc. If the contact is severely burned, the product should be replaced.
