Compact Siemens – 3rs1120‑1dd30 – Sirius Temperature Monitoring Relay Typej Thermocouple Equipment [WKqCznOh]

The Siemens 3RS1120‑1DD30 (SIRIUS series) is a DIN-rail-mountable temperature monitoring relay that monitors temperature via a Type J thermocouple. It features two independently adjustable overshoot thresholds to signal when measured temperature exceeds set limits, helping protect equipment in industrial control systems.

Key Features & Technical Specifications:

• Model: 3RS1120‑1DD30, SIRIUS temperature monitoring relay  

• Sensor Input: Type J thermocouple, measuring range 0 °C to 600 °C  

• Functionality: Dual-threshold overshoot detection (“exceeding 2 threshold values”)  

• Supply Voltage: 24 V AC/DC (50/60 Hz)  

• Contacts: 1 NO + 1 CO (1 normally open + 1 changeover) relay outputs via screw terminals, plug-in socket  

• Connection: Screw-type terminals; DIN-rail snap-mountable (35 mm rail)  

• Dimensions: 22.5 mm wide × 102 × 91 mm (H×D)  

• Operating Temp.: –25 °C to +60 °C