Advanced Terminology and Extended Technical Questions
40. What is an IK impact rating, and how does it relate to an IP waterproof rating?
IK is the mechanical impact-resistance scale defined under IEC 62262/EN 62262 — a higher number means the switch can absorb more impact energy; IK10, for example, corresponds to roughly 20 joules, similar to a 5 kg object dropped from 40 cm. IP and IK are separate scales: IP covers dust and water ingress, IK covers mechanical impact, and one doesn't substitute for the other. Some Salecom metal and rocker series can provide impact-rating data — confirm the actual figure against the specific part number's datasheet.
41. What's the difference between gold-plated and silver-plated terminals, and how do I choose?
Silver plating is lower cost and handles a wider current/voltage range, making it suited to higher-load power switching, though it can oxidize over time and affect contact resistance. Gold plating gives lower and more stable contact resistance with better oxidation resistance, making it suited to low-current signal applications or anything needing long-term stable contact — automotive panels, medical instruments, and precision control circuits. Choose based on load current, operating environment, and life requirement, not price alone.
42. What do "mechanical life" and "electrical life" mean, and are they the same thing?
Mechanical life is the number of actuations the mechanism can withstand with no load applied; electrical life is the number of actuations the switch can sustain while maintaining proper conduction and contact condition under actual voltage and current — and it's typically lower than mechanical life. Electrical life tends to drop as load approaches or exceeds the rated value, or as humidity and dust increase. Check both figures during selection and translate them into an expected service life based on actual duty cycle, rather than quoting whichever number is higher.
43. What is contact bounce, and how does it affect circuit design?
Contact bounce is the rapid, unintended make-and-break that happens at the instant of pressing or releasing a mechanical switch, caused by spring vibration — it's a physical characteristic of mechanical switches, not a defect. If downstream logic counts single triggers (event counting, interrupt triggers), add debounce handling in firmware or circuitry to avoid misreading one press as several. Bounce duration is affected by operating force, spring material, and travel design, but its presence isn't itself a sign of the wrong switch choice.
44. How should I think about operating force and travel?
Operating force is how much force a user must apply to actuate the switch; travel is the distance the actuator moves before triggering — together they define the tactile feel. Too little force invites accidental activation; too much feels stiff or fatiguing. Too little travel gives weak feedback; too much slows down response. Automotive, medical, and industrial control panels usually specify force and travel ranges based on human-factors requirements — for custom projects, describe the preferred feel or provide a reference sample.
45. What does an operating temperature range mean, and can a switch be used outside it?
The operating temperature range is where the switch maintains normal electrical behavior and mechanical life; exceeding the upper limit can soften materials, reduce sealing performance, or shift contact characteristics, while going below the lower limit can embrittle materials or cause sticking. If the actual environment approaches or exceeds the datasheet's limits — engine compartments, outdoor extreme cold — raise this during selection so material or structural changes can be evaluated before mass production, not after.
46. Can a switch be used directly in environments with alcohol or chemical cleaning agents?
It depends on the chemical compatibility of the housing, gasket, and cap material. General-purpose silicone or plastic materials tolerate water and common cleaners reasonably well, but specific alcohols, solvents, or disinfectants can swell, discolor, or degrade the seal over time, which can eventually affect the waterproof rating. For medical, lab, or food-cleaning environments, specify the cleaning agent type and frequency during selection so a suitable material combination can be evaluated.
47. What do the letters and numbers after a switch model mean, and how do I avoid ordering the wrong part number?
A Salecom part number typically encodes product type, contact configuration (e.g., SPDT, DPDT), terminal style, actuation method, and custom options (cap color, LED) in sequence — the exact coding logic differs by series. Before ordering, get the full datasheet for the target series and check contact count, electrical rating, and terminal type field by field. If unsure, share the current part number in use or a competitor's reference part number so sales or engineering can verify the match before order placement.