“Thermal fuses of SW series, produced in Korea by our SUNG WOO partners, are disposable devices featuring utmost safety – R&D Components explains –. They perform their function by opening an electrical contact once reached the temperature for which they are manufactured. The intervention is caused by the thermal pellet, a chemical-organic compound that, due to the achievement of such temperature, shifts from a solid state to a liquid state. They are disposable safety devices for a single operation and they must be replaced once they have intervened. This makes the thermal fuse very suitable for various household appliances, such as refrigerators, irons, coffee machines and electric heaters”. Intervention temperatures range from 72°C to 240°C. The SW1 series works at 10A and 15A for 250V and the SW3 series works at 21A for 250V. They are UL, C-UL, VDE, TUV, PSE, K-MARK, CCC approved.
Features of the bimetallic and one-shot thermostats
“TK24 and TK32 – R&D Components adds – are instead bimetallic thermostats, produced by our Armenian partners from THERMOREX. The operation principle is bimetal one, and then the contact opening is due to the different expansion coefficient of the metals that make up the bimetallic sheet”. Concerning TK24, when temperature starts decreasing, also the bimetal changes its curvature, until the return to the initial position, therefore they have an automatic reset. TK24 thermostats have an intervention range that goes from -45°C to +425°C. Up to 110°C, they can reach a precision of +/-1°C and a recovery of 5°C under intervention.
Regarding TK32, the reset will occur manually by pressing the specific pushbutton. The maximum temperature they can reach is 250°C. The whole TK series is UL- and VDE-approved.
Finally, TK32OS are one-shot thermostats, which do not reset and can reach even 425°C, in the same structural solutions as TK24 and TK32.