Siemens 3RS11 20-2DD20 Temperature Monitoring Relay, Cage Clamp Terminal, Analog Setting, 2 Threshold Values, 22.5mm Width, 1 NO + 1 CO Contact Type, Overrange Function, Typ J Thermocouple Sensor, 0-200 Degrees Celsius Measuring Range, 24VAC/VDC Control Supply Voltage at 50-60Hz

The semiconductor contactors are selected on the basis of details of the power system, the load and the ambient conditions. As the semiconductor contactors are already equipped with an optimally matched heat sink, the selection process is considerably simpler than that for semiconductor relays.