The 3RN2011-2BA30 is a temperature monitoring relay from Siemens. It is designed to measure and control temperatures, and has an operating voltage of both 24VAC and 24VDC. It features a non-adjustable switching point and a reset temperature range for temperature control. Additionally, it has a LED status indicator, a power indicator, and a fault indicator. It is suitable for a range of applications, including compressors, chillers, boilers, and pumps.