The Siemens 3RN2013-1GW30 is a SIRIUS 3RN2 thermistor motor protection relay — a standard evaluation unit with ATEX approval, open-circuit and short-circuit detection in the sensor circuit, safe disconnection, and non-volatile error memory. It's designed to protect motors by monitoring PTC thermistor sensors embedded in the windings. The relay trips when the winding temperature exceeds the sensor's threshold, preventing thermal damage. Rated supply voltage covers 24 to 240 VAC/DC at 50/60 Hz, making it usable across most industrial control voltages without a separate power supply module. The relay's MTBF is 97 a and MTTFd is 303 a, reflecting a design suited for continuous-duty applications where unplanned downtime is costly.
IP20 protection means it's for use inside a panel enclosure, not in wet or dusty environments. Pollution degree 3 suits industrial atmospheres with conductive or dry non-conductive pollution. The relay accepts solid and stranded conductors 20–12 AWG (1x 20–12, 2x 20–14 for solid), with a strip length matching standard terminal blocks. The 90 mm depth leaves clearance for wiring ducts and adjacent components. Output contacts are rated 1 A at 24 V, 0.2 A at 125 V, and 0.1 A at 250 V — these are the switching currents for the relay's output, not motor load currents. The relay signals a PLC or contactor coil; it does not switch motor power directly.
The relay carries ATEX approval for use in potentially explosive atmospheres, with open-circuit and short-circuit detection in the sensor circuit and safe disconnection. The standard evaluation unit includes non-volatile error memory and auto-reset capability. External reset is supported. The display version has an LED for status indication.