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RTS – Reflowable Thermal Switch from Schurter

20 April 2018

Schurter’s RTS is a compact overtemperature protection device using advanced SMD technology suited for the demands in power semiconductors.

RTS stands for "Reflowable Thermal Switch". It was developed to protect highly integrated power semiconductors like MOSFETs, ICs, IGBTs, Triacs, SCRs, etc. from overheating. Before mechanical activation, the RTS can be mounted using conventional reflow soldering techniques with temperature profiles up to 260°C.

Mechanical activation

After having the RTS reflow soldered on a PCB, mechanical activation arms the RTS for tripping at 210°C. This activation can be done manually or by fully automated means. In contrast to electrical activation, the RTS activation status is clearly and immediately visible to the installer. Furthermore, the third additional contact required for electrical activation is thereby eliminated.

Compact dimensions, high load capacity

The new type of overtemperature protection shines with the smallest dimensions and highest load capacity. Operating currents up to 100 A at rated voltages of up to 60 VDC can be handled by the RTS, which is just 6.6 x 8.8mm in size. Customer-specific variants are available with an integrated shunt or an additional overcurrent fuse. These further integrated functions are resulting in less space consumed on the printed circuit board. The Reflowable Thermal Switch meets the high reliability requirements of AEC-Q200 and MIL-STD. 

Protection against thermal runaway 

Thermal runaway refers to the overheating of a power semiconductor due to a self-reinforcing, heat-producing process. The reasons for this are the ever increasing power density and the trend towards miniaturisation of electronic circuits.

RTS protects power semiconductors not through a logic circuit but rather through basic laws of physics. In case of a thermal runaway, the RTS reliably interrupts the circuit precisely at the well-defined temperature.

Technical Data

• Rated Voltage 60 VDC
• Tripping temperature 210°C
• Operating current up to 100 A 


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