Siemens 3RS1020-1DD20

The Siemens 3RS1020-1DD20 is a temperature monitoring relay designed to work with PT100 sensors, offering precise control within a range of 0 °C to 200 °C. This compact device, measuring just 22.5 mm wide, features two threshold settings for overshoot detection and includes one normally open (NO) and one changeover (CO) contact. It operates on 24 V AC/DC and uses screw terminals for both the load and quiescent currents, ensuring secure and reliable connections. While this model has been phased out, it remains available through BSP Automation for those maintaining legacy systems or requiring specific configurations. For new installations, the recommended replacement is the Siemens 3RS2600-1BA30.