How the mechanism works<\/h2>\n
Most industrial micro switches use a snap-action mechanism that transfers slowly applied actuator force into a rapid contact change. This helps repeatability and reduces the time contacts spend between states. The external actuator and internal mechanism form one mechanical chain. Contact material and geometry form a separate electrical boundary. Both boundaries must be satisfied at the same time, and the complete machine must be tested under realistic tolerances.<\/p>\n This table is intentionally qualitative. Numerical limits, ratings, torque, force, travel, environmental claims, and endurance values must be taken from the current datasheet and evaluated under the application conditions.<\/p>\n What to verify:<\/strong> Match plunger, lever, or roller to the target motion. Geometry determines force, reach, speed, and wear. The requirement should be written in the project specification and traced to the exact model drawing or datasheet. Review worst-case tolerance, wear, contamination, maintenance access, and foreseeable misuse. If the available documentation does not define the boundary, keep the point open for supplier confirmation and sample testing rather than substituting an assumption.<\/p>\n What to verify:<\/strong> Confirm the available force at worst-case alignment. Insufficient force causes missed operation; excessive force damages parts. The requirement should be written in the project specification and traced to the exact model drawing or datasheet. Review worst-case tolerance, wear, contamination, maintenance access, and foreseeable misuse. If the available documentation does not define the boundary, keep the point open for supplier confirmation and sample testing rather than substituting an assumption.<\/p>\n What to verify:<\/strong> Check pretravel, operating point, overtravel, and release travel. The target must operate and reset reliably without bottoming out. The requirement should be written in the project specification and traced to the exact model drawing or datasheet. Review worst-case tolerance, wear, contamination, maintenance access, and foreseeable misuse. If the available documentation does not define the boundary, keep the point open for supplier confirmation and sample testing rather than substituting an assumption.<\/p>\n What to verify:<\/strong> Map COM, NO, and NC to the required state logic. Terminal position must come from the exact diagram. The requirement should be written in the project specification and traced to the exact model drawing or datasheet. Review worst-case tolerance, wear, contamination, maintenance access, and foreseeable misuse. If the available documentation does not define the boundary, keep the point open for supplier confirmation and sample testing rather than substituting an assumption.<\/p>\n What to verify:<\/strong> Define voltage, current, AC\/DC type, inrush, and minimum load. A resistive rating cannot be applied blindly to another load. The requirement should be written in the project specification and traced to the exact model drawing or datasheet. Review worst-case tolerance, wear, contamination, maintenance access, and foreseeable misuse. If the available documentation does not define the boundary, keep the point open for supplier confirmation and sample testing rather than substituting an assumption.<\/p>\n What to verify:<\/strong> Estimate realistic operations and switching duty. Mechanical and electrical life are different limits. The requirement should be written in the project specification and traced to the exact model drawing or datasheet. Review worst-case tolerance, wear, contamination, maintenance access, and foreseeable misuse. If the available documentation does not define the boundary, keep the point open for supplier confirmation and sample testing rather than substituting an assumption.<\/p>\n What to verify:<\/strong> Check dust, moisture, oil, temperature, shock, and vibration. The installation may require a sealed assembly or enclosure. The requirement should be written in the project specification and traced to the exact model drawing or datasheet. Review worst-case tolerance, wear, contamination, maintenance access, and foreseeable misuse. If the available documentation does not define the boundary, keep the point open for supplier confirmation and sample testing rather than substituting an assumption.<\/p>\n What to verify:<\/strong> Verify holes, torque, clearances, terminal style, and strain relief. Integration errors can dominate switch performance. The requirement should be written in the project specification and traced to the exact model drawing or datasheet. Review worst-case tolerance, wear, contamination, maintenance access, and foreseeable misuse. If the available documentation does not define the boundary, keep the point open for supplier confirmation and sample testing rather than substituting an assumption.<\/p>\n For every application, include startup, normal operation, shutdown, loss of power, restoration of power, maintenance mode, component replacement, and the faults identified by the risk assessment. A general control switch should not be treated as a complete safety function.<\/p>\n Provide the application, target market, applicable standards, machine function, supply and load, control interface, contact logic, mechanical drawing, motion path, panel dimensions, cable method, environment, operating frequency, quantity, documentation needs, and sample-validation plan. Ask the supplier to identify assumptions and exceptions. ONPOW offers relevant products in its application-specific product family<\/a> and the broader industrial control product range<\/a>.<\/p>\n![\"ONPOW](\"https:\/\/onpowbutton.com\/wp-content\/themes\/onpow\/assets\/images\/ltm-1704-2-product__1704.png\" "\\"ONPOW")
Selection criteria at a glance<\/h2>\n
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\n \nDecision area<\/th>\n What to verify<\/th>\n Engineering reason<\/th>\n<\/tr>\n<\/thead>\n \n Actuator<\/strong><\/td>\n Match plunger, lever, or roller to the target motion<\/td>\n Geometry determines force, reach, speed, and wear.<\/td>\n<\/tr>\n \n Operating force<\/strong><\/td>\n Confirm the available force at worst-case alignment<\/td>\n Insufficient force causes missed operation; excessive force damages parts.<\/td>\n<\/tr>\n \n Travel<\/strong><\/td>\n Check pretravel, operating point, overtravel, and release travel<\/td>\n The target must operate and reset reliably without bottoming out.<\/td>\n<\/tr>\n \n Contact form<\/strong><\/td>\n Map COM, NO, and NC to the required state logic<\/td>\n Terminal position must come from the exact diagram.<\/td>\n<\/tr>\n \n Load<\/strong><\/td>\n Define voltage, current, AC\/DC type, inrush, and minimum load<\/td>\n A resistive rating cannot be applied blindly to another load.<\/td>\n<\/tr>\n \n Frequency and life<\/strong><\/td>\n Estimate realistic operations and switching duty<\/td>\n Mechanical and electrical life are different limits.<\/td>\n<\/tr>\n \n Environment<\/strong><\/td>\n Check dust, moisture, oil, temperature, shock, and vibration<\/td>\n The installation may require a sealed assembly or enclosure.<\/td>\n<\/tr>\n \n Mounting and terminals<\/strong><\/td>\n Verify holes, torque, clearances, terminal style, and strain relief<\/td>\n Integration errors can dominate switch performance.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n Detailed selection process<\/h2>\n
Actuator<\/h3>\n
Operating force<\/h3>\n
Travel<\/h3>\n
Contact form<\/h3>\n
Load<\/h3>\n
Frequency and life<\/h3>\n
Environment<\/h3>\n
Mounting and terminals<\/h3>\n
![\"ONPOW](\"https:\/\/onpowbutton.com\/wp-content\/themes\/onpow\/assets\/images\/ltm-1701-2-product__1701.png\" "\\"ONPOW")
Application review<\/h2>\n
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Commissioning checklist<\/h2>\n
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Common mistakes<\/h2>\n
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What to include in an RFQ<\/h2>\n
Related ONPOW guides<\/h2>\n