| Basic Design | Switching mechanism | Snap-action, normally open, normally closed, or changeover contact arrangement | Confirm the required contact logic, terminal configuration, switching direction, and compatibility with the control circuit. |
| Actuation | Actuator type | Plunger, roller lever, simulated roller, hinge lever, or long lever | Select the actuator according to the available mechanical space, object approach angle, travel profile, and required operating force. |
| Mechanical Performance | Operating force | Approximately 0.3 to 5 N, depending on construction and actuator | Verify operating force and release force together. Excessive force may damage the application, while insufficient force can cause unreliable switching. |
| Mechanical Performance | Pre-travel and over-travel | Typically specified in millimetres; values vary significantly by model and actuator | Request the complete movement diagram, including pre-travel, operating travel, over-travel, and reset travel. |
| Electrical Rating | Contact rating | Common low-power ratings range from a few hundred milliamperes to approximately 10 A at low-voltage AC or DC | Check the exact voltage, current, load type, inrush current, switching frequency, and whether the rating applies to resistive or inductive loads. |
| Electrical Rating | Contact configuration | SPST-NO, SPST-NC, or SPDT arrangements are commonly available | Match the number of poles and the normally open or normally closed state to the wiring diagram and fail-safe requirements. |
| Electrical Performance | Contact resistance | Often specified below 100 mΩ when new, subject to test current and contact material | Review the test method and maximum permitted value. Low contact resistance is important for signal circuits and low-voltage applications. |
| Electrical Performance | Insulation resistance | Commonly specified at 100 MΩ or higher under a defined test voltage | Confirm the test voltage, measured terminals, humidity conditions, and minimum acceptance value in the technical datasheet. |
| Durability | Mechanical life | Approximately 100,000 to 10,000,000 operations for different product classes | Mechanical life does not equal electrical life. Compare both figures under the actual operating force, travel, and load conditions. |
| Durability | Electrical life | Often approximately 10,000 to 1,000,000 operations, depending on load and switching conditions | Ask for test-cycle details, load type, switching rate, arc suppression method, and end-of-life criteria. |
| Environmental | Operating temperature | Common ranges include approximately -40°C to +85°C; special versions may extend beyond this range | Consider ambient temperature, self-heating, storage conditions, condensation, and temperature cycling in the final installation. |
| Environmental | Ingress protection | Unsealed versions may have limited protection; sealed versions are commonly available up to IP67 when properly rated | Verify the complete assembly rating, including actuator, terminals, cable entry, mounting interface, and test standard. |
| Materials | Housing and terminals | Insulating engineering plastics with copper-alloy terminals and plated or treated contact surfaces | Request material declarations, flammability information, terminal plating details, and compatibility with the installation environment. |
| Mounting | Terminal and mounting style | Solder terminals, quick-connect terminals, PCB terminals, screw mounting, or snap-in mounting | Confirm terminal dimensions, mounting-hole spacing, panel thickness, connector compatibility, and required tooling. |
| Compliance | Common regulatory requirements | RoHS and REACH declarations; safety approvals may be available for applicable product categories | Request current compliance documents, test reports, marking details, and certificates relevant to the destination market. |
| Quality Control | Production and inspection records | Typical controls include dimensional inspection, contact-resistance testing, dielectric testing, and life-cycle sampling | Evaluate inspection plans, traceability, lot identification, change-control procedures, and corrective-action capability before approval. |
| Supply Chain | Packaging and logistics | Moisture-resistant packaging, batch labeling, carton quantity control, and export documentation | Confirm minimum order quantity, standard lead time, production capacity, packaging specifications, Incoterms, and spare-part availability. |
| Technical Validation | Sample approval process | Drawing review, sample testing, pilot production, and first-article approval | Use application-specific samples and test the switch under actual voltage, current, mechanical travel, vibration, temperature, and contamination conditions. |