Multicomp Pro MP-11 Thermal Switch, Normally Closed, 20°C

The Multicomp Pro MP-11 is a precision snap-action thermostat switch, engineered to automatically regulate temperature by sensing changes at its set point of 20°C. As a normally closed (N/C) device, it breaks the circuit upon reaching this temperature, effectively deactivating a heating system or activating a cooling mechanism to maintain the desired environmental conditions. It is designed for reliable operation within a range of 125V to 250V at 16A, making it a robust component for various control systems.

Construction and Reliability

Built for durability and consistent performance, the switch features high-quality electrical contacts made from AgNi/Cu (T2) for both stationary and movable points, ensuring excellent conductivity and longevity. The brass stationary arm and alloy copper movable arm provide mechanical stability. The housing utilises a PF (phenolic) case and top cover, offering good electrical insulation and heat resistance. The temperature sensing is driven by a precise bimetal disc and an aluminium cap with a ceramic actuator pin, all mounted on a sturdy SUS430 steel flange for secure attachment.

Technical Specifications and Safety

This thermal switch meets rigorous international safety and performance standards, including GB14536.1-2008, UL60730, and EN60730-1. Key electrical specifications include a terminal resistance below 50MΩ at DC5V/0.25A and an insulated resistance above 100MΩ with DC500V applied between terminals and the cap. The set temperature is accurately calibrated to 20°C ±3°C, with an automatic reset occurring at 10°C ±3°C. Its quick-connect sensor terminals facilitate easy and secure wiring integration.

Applications

This versatile component is commonly integrated into heating, ventilation, and air conditioning (HVAC) systems, domestic appliances, and industrial automation for process control. It serves as a critical safety and regulation device in any a