Schurter’s RTS is a compact thermal switch which protects power semiconductors, safely interrupting the circuit in over-temperature conditions. It gives physical protection against the risk of thermal run-away, guaranteeing the circuit will shut down should software-based safety measures fail.
The RTS, or Reflowable Thermal Switch, protects power semiconductors such as MOSFETs, IGBTs, triacs and Silicon-Controlled Rectifiers (SCRs) from overheating. The RTS is a surface-mount device which may be assembled on a PCB using conventional reflow soldering techniques with temperature profiles up to 260°C before it is activated.
After the RTS is soldered to a PCB, mechanical activation arms the RTS for tripping at an over-temperature threshold of 210°C. The advantage of mechanical activation over the electrical activation required by other thermal switches is that the activation status is immediately visible to the installer. In addition, the RTS does not require the third contact required by devices that are activated electrically.
The RTS, which has a footprint of just 6.6mm x 8.8mm, can handle operating currents up to 100A at rated voltages of up to 60V DC. Variants of the RTS are available with an integrated shunt or an additional over-current fuse. Integrating these functions into the RTS extends the space-saving benefits of the device in high-power circuits.