How the mechanism works<\/h2>\n
The actuator transfers external movement to an internal snap-action or slow-action contact mechanism. Reliable operation requires the moving target to cross the operating point while staying inside the permitted overtravel and force limits. Release motion must also cross the reset point. Cam shape, alignment, speed, vibration, and wear can change the effective stroke, so a switch that clicks on a bench may still be unreliable in the machine.<\/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> Direct axial approach with tightly controlled alignment. Compact and repeatable, but poorly suited to side loading. 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> Direct approach where the target also slides across the actuator. Rolling contact reduces rubbing but adds height and a rotating part. 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> A cam approaches from the side and additional reach is needed. The lever changes force and travel at the internal plunger. 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> Repeated cam travel across the actuator. The roller reduces sliding wear and helps a cam pass smoothly. 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> The operating radius must be tuned during setup. Adjustment adds flexibility but must be locked and documented. 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> The target position varies across a wider area. Flexible reach tolerates misalignment but usually reduces positional precision. 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> The mechanism requires bidirectional or application-specific engagement. Use only with the exact manufacturer motion 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> Dust, oil, spray, or condensation can reach the switch. The complete housing and cable entry must match the environment. 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![\"Straight-plunger](\"https:\/\/onpowbutton.com\/wp-content\/themes\/onpow\/assets\/images\/ltm-1704-2-product__1704.png\" "\\"Straight-plunger")
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 Straight plunger<\/strong><\/td>\n Direct axial approach with tightly controlled alignment<\/td>\n Compact and repeatable, but poorly suited to side loading.<\/td>\n<\/tr>\n \n Roller plunger<\/strong><\/td>\n Direct approach where the target also slides across the actuator<\/td>\n Rolling contact reduces rubbing but adds height and a rotating part.<\/td>\n<\/tr>\n \n Hinge lever<\/strong><\/td>\n A cam approaches from the side and additional reach is needed<\/td>\n The lever changes force and travel at the internal plunger.<\/td>\n<\/tr>\n \n Roller lever<\/strong><\/td>\n Repeated cam travel across the actuator<\/td>\n The roller reduces sliding wear and helps a cam pass smoothly.<\/td>\n<\/tr>\n \n Adjustable lever<\/strong><\/td>\n The operating radius must be tuned during setup<\/td>\n Adjustment adds flexibility but must be locked and documented.<\/td>\n<\/tr>\n \n Rod or whisker<\/strong><\/td>\n The target position varies across a wider area<\/td>\n Flexible reach tolerates misalignment but usually reduces positional precision.<\/td>\n<\/tr>\n \n Fork or special head<\/strong><\/td>\n The mechanism requires bidirectional or application-specific engagement<\/td>\n Use only with the exact manufacturer motion diagram.<\/td>\n<\/tr>\n \n Sealed actuator assembly<\/strong><\/td>\n Dust, oil, spray, or condensation can reach the switch<\/td>\n The complete housing and cable entry must match the environment.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n Detailed selection process<\/h2>\n
Straight plunger<\/h3>\n
Roller plunger<\/h3>\n
Hinge lever<\/h3>\n
Roller lever<\/h3>\n
Adjustable lever<\/h3>\n
Rod or whisker<\/h3>\n
Fork or special head<\/h3>\n
Sealed actuator assembly<\/h3>\n
![\"Lever-actuated](\"https:\/\/onpowbutton.com\/wp-content\/themes\/onpow\/assets\/images\/ltm-1701-2-product__1701.png\" "\\"Lever-actuated")
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