The Siemens 3RN1013-2GW00 is a thermistor motor protection evaluation unit from the SIRIUS family. It monitors motor winding temperature via PTC thermistors and trips when the threshold is exceeded, preventing thermal damage. The unit accepts a universal AC/DC supply from 24 to 240 V (50/60 Hz), so it works across control voltages without a separate power supply module.
Key Ratings and What They Mean for Fit
The 3RN1013-2GW00 provides two CO (changeover) contacts for auxiliary signaling — enough to drive a PLC input and a local alarm lamp simultaneously. No NC or NO contacts are dedicated; all auxiliary switching is through the CO pair. The spring-loaded terminals accept solid or ferruled stranded wire up to 2.5 mm²; strip length around 8 mm avoids whiskers under the cage. The unit is rated IP20, so it belongs inside a panel, not in a washdown zone. Operating temperature range of -25 to +60 °C covers most control cabinet environments, but verify ambient near the drive if the cabinet runs hot. A built-in reclosing lockout function prevents automatic restart after a trip — the motor stays off until the fault is acknowledged and reset. This is critical for unattended or remote installations where an automatic reclose could cause injury or equipment damage. The LED display gives a quick visual indication of the unit's state (tripped, running, or fault), which speeds troubleshooting on the floor.
Mounting and Integration
The 3RN1013-2GW00 snaps onto a 35 mm DIN rail (screw and snap-on mounting) and occupies a single 22.5 mm width slot — standard for a slim motor protection relay. Depth is 91 mm, so it clears most shallow enclosures. The spring-loaded terminals face forward, making wiring accessible without removing adjacent units. No backplane bus or external power supply needed; the control voltage is wired directly to the terminals.