KSD301 85°C Normally Closed (NC) Thermal Control Switch – 10A 250V Bimetal Snap-Action Thermostat for Mid-Range Temperature Control

The KSD301 85°C is a compact, high-performance bimetal thermostat designed for reliable temperature regulation and overheat protection. As a "Normally Closed" (NC) component, it remains in a conducting state during standard operation. When the temperature of the monitored surface rises to 85°C, the internal bimetal disc reaches its activation point and "snaps" to open the contacts. This autonomous action instantly cuts off power to the heating element or motor, protecting the system from thermal damage. Constructed with high-grade industrial materials, this thermal switch features a rugged housing that provides excellent electrical insulation and heat resistance. Its compact 1/2-inch disc design and integrated mounting flange allow it to be easily secured to flat or curved surfaces using screws, making it a versatile choice for both repairs and new engineering projects. The 85°C threshold is particularly popular for use in water dispensers, electric kettles, and larger power supply units where maintaining a consistent mid-range temperature is critical. Beyond its mechanical reliability, the KSD301 offers a "fail-safe" layer of protection that operates independently of any digital sensors or microcontrollers. This makes it an essential safety component for preventing fires and electrical failures in consumer electronics. Whether you are maintaining industrial coffee makers or building a custom temperature-controlled enclosure, the KSD301 85°C provides the industrial-standard performance you can trust.

Key Features:

Instant Snap-Action Logic: Features a high-speed bimetal disc that ensures a clean, rapid circuit interruption, reducing electrical arcing and extending contact life.

Automatic Reset Capability: Once the system cools down approximately 10–20°C below the trip point, the switch automatically resets, allowing the circuit to resume operation.

Universal Electrical Rating: Built to handle standard domestic and industrial loads up to 10A at 250V AC, providing reliable safety for high-wattage devices.

Aluminum Sensing Interface: Equipped with a flat aluminum cap designed for maximum surface contact, ensuring rapid heat transfer and accurate temperature detection.

Standard 6.3mm Terminals: Features industry-standard 1/4" quick-connect terminals for easy integration into wiring harnesses for household appliances and machinery.