| Contact Configuration | Momentary or maintained action; normally open, normally closed, or changeover contacts; single-pole or multi-pole options | The contact arrangement determines how the switch integrates with control circuits and safety functions. | Clear circuit diagrams, terminal identification, and model-specific datasheets | 10% | Match the approved circuit diagram with the purchase order and samples. |
| Electrical Rating | Voltage, current, AC/DC load type, inrush current, and utilization category must be specified for the exact contact system. | A switch rated for one load type or voltage cannot automatically be assumed suitable for another. DC switching can be more demanding because the arc does not naturally pass through an AC zero crossing. | Model-specific electrical ratings tested under the applicable standard | 15% | Confirm the complete AC and DC rating table, load category, and derating conditions. |
| Ingress Protection | IP65 for protection against dust and water jets; IP67 or IP69K where temporary immersion or high-pressure, high-temperature washing is required. | The required rating depends on the enclosure, mounting method, seal design, and actual cleaning or exposure conditions. | IEC 60529 test classification; test report or certificate for the exact configuration | 15% | Check whether the rating applies to the front panel only or to the complete assembled switch. |
| Mechanical Durability | At least 100,000 mechanical operations for general industrial control; higher cycle requirements should be validated for the intended application. | Mechanical life and electrical life are different. Contact wear, actuator wear, and load conditions affect service life. | Published mechanical and electrical endurance test conditions | 12% | Request cycle count, operating force, travel, load, and test-speed details. |
| Material and Corrosion Resistance | Stainless steel or corrosion-resistant plated metal for the actuator and bezel; suitable terminal and sealing materials for the environment. | Salt, humidity, chemicals, outdoor exposure, and cleaning agents can degrade finishes, seals, and contacts. | Material declarations, salt-spray or corrosion test data where applicable, and environmental test reports | 10% | Verify the exact metal grade, surface treatment, gasket material, and chemical compatibility. |
| Temperature Performance | A declared operating range commonly around −20°C to +55°C or wider, depending on the design and application. | Temperature affects contact resistance, seal elasticity, actuator force, LED performance, and material durability. | Environmental testing under the IEC 60068 series or an equivalent documented test method | 8% | Compare the supplier's operating, storage, and transport temperature ranges. |
| Actuation and Ergonomics | Consistent operating force, defined travel, tactile feedback, anti-rotation design, and optional guarded or emergency-stop variants where required. | Ergonomic consistency reduces accidental operation and improves operator feedback during repeated use. | Mechanical drawings, force-travel curves, actuator test data, and safety-function documentation | 8% | Test samples with gloves, panel thickness, mounting torque, and the intended operating position. |
| Lighting and Indication | LED voltage options, color consistency, illumination angle, polarity information, and current consumption clearly defined. | Incorrect LED voltage or polarity can cause premature failure or prevent illumination. | LED electrical specifications, wiring diagrams, and photometric or visual inspection criteria | 6% | Confirm voltage tolerance, current draw, color code, and illuminated-symbol availability. |
| Safety and Product Standards | Evidence of conformity to the standard applicable to the switch type and end product; certification must be traceable to the exact model or series. | A logo or general statement alone does not prove that the selected configuration has been evaluated. | IEC/EN 61058-1 may apply to appliance switches; IEC 60947-5-1 may apply to low-voltage control-circuit devices. Applicability depends on design and use. | 12% | Validate certificate number, scope, ratings, conditions of acceptance, and certification body database entry. |
| Environmental Compliance | RoHS and REACH documentation appropriate to the destination market, with controlled material declarations. | Material restrictions and substance reporting may be required for market access and customer audits. | EU RoHS Directive 2011/65/EU as amended by Directive (EU) 2015/863; REACH Regulation (EC) No 1907/2006 | 7% | Request current declarations, substance disclosures, and change-notification commitments. |
| Quality Management | Documented quality system, traceability, incoming-material control, process inspection, and corrective-action procedures. | Consistent production controls are essential when the same switch is purchased over multiple production lots. | ISO 9001 certification can demonstrate a quality-management system; it is not, by itself, product certification. | 5% | Check certificate validity, manufacturing-site scope, lot coding, and sample inspection records. |
| Supply Capability | Stable lead time, documented minimum order quantity, spare-part availability, engineering support, and formal change control. | A technically suitable switch can still create project risk if supply continuity and configuration control are weak. | Capacity statements, quality agreements, product-change notices, and representative delivery records | 7% | Review forecast support, alternate materials, tooling ownership, and end-of-life notification periods. |