Adjustable Bimetal Thermostat Switch

At the core of the KST unit lies a robust bimetallic element—commonly a copper-nickel alloy bonded to stainless steel—that achieves predictable deflection under controlled heating. As the temperature in the steam chamber rises, this disc bends until it reaches a critical snap point. It is this snap action that separates the electrical contacts, cutting power in a single decisive motion. This rapid transition reduces arcing and wear on the contact surfaces, which are generally plated in silver or copper-tin alloys to maintain low electrical resistance throughout the product's lifespan.

The adjustable feature is not superficial. It incorporates a calibrated mechanical interface—whether a screw, dial, or detent mechanism—that engages directly with the contact carrier or disc pusher. Proper mechanical amplification and engagement prevent stiction and ensure reliable, repeatable actuation. Precise control over hysteresis—the gap between cut-off temperature and reset temperature—is engineered into the disc assembly. This margin, often between 5 °C and 15 °C, is critical in preventing cycling chatter and ensuring clean reset behavior, avoiding nuisance re-triggering during normal cooling phases.

Qianxun balances this adjustability with durability by employing heat-resistant housings made from glass-filled phenolic or high-grade polyamide. These materials resist steam-induced moisture, thermal fatigue, and maintain structural integrity under repeated cycles. Terminals are typically fashioned from brass and plated with tin or nickel, combining high conductivity with corrosion resistance. Mounting interfaces are engineered for precise alignment within kettle steam tubes, again to guarantee that the bimetal strip receives a direct, consistent flow of steam for accurate responsiveness.

Functionally, the KST thermostat is rated for up to 16 A at 250 V AC, making it apt for high-power kettle elements. The wide current capacity accommodates variable element sizes and higher wattage models. Internally, a heavy leaf spring maintains contact pressure through vast temperature cycles, and dual-disc designs or integrated thermal fuses serve as supplementary protections if the primary mechanism fails. These fail‑safe features are essential for regulatory compliance, helping secure approvals under standards like IEC 60730 or UL 376.

Manufacturing consistency is assured through automated production systems, including optical disc curvature measurement, spring preload testing, and temperature cycling chambers. Each unit undergoes contact resistance testing and dielectric breakdown evaluation before shipping. Such quality control is vital given the high moisture, rapid temperature ramp environments typical of kettle use. Supporting certification programs, Qianxun provides CE, RoHS declarations, and potentially TÜV or CB listings, offering validation to OEMs seeking global market entry.

From an integration standpoint, the KST adjustable thermostat supports rapid OEM adoption. Units are offered with adjustable knobs or external levers that protrude through upper kettle housings, allowing end-user reset options. Others are designed for internal mounting, with preset adjustments locked before shipment. Packaging ranges from bulk loose pieces for OEM assembly to branded retail, supporting both large-scale manufacturing requirements and private-label branding.

Qianxun's KST adjustable bimetal thermostat switch embodies a refined synthesis of thermal-mechanical engineering, materials science, and production well. It offers kettle OEMs a reliable, configurable solution that supports diverse product applications, meets regulatory demands, and keeps procurement and assembly efficient. Integrating this thermostat provides predictable cut-off behavior, robust safety redundancy, and tailored performance features essential in producing competitive, high-quality kettle products.