Siemens sirius temperature monitoring relay 110230 v ac siemens 3rs1000 1ck10 the siemens 3rs1000 1ck10 is a temperature monitoring relay from the 3rs10 range it can be used for measuring temperatures in solid liquid and gas media the temperature is measured by a sensor in the medium for overshoot analysed by the unit and then checked to identify whether the temperature is too high too low or within a specified window depending on the settings the output relay is activated or deactiv