Siemens 3RU2116-1BB0 Motor Protection Overload Relay

Siemens 3RU2116-1BB0 is a three-pole thermal overload relay for motor protection, adjustable from 1.4 to 2.0 A per phase and sized for Size S00 contactors. It mounts to compatible Siemens contactor assemblies and uses screw terminals for both the main circuit and the auxiliary circuit. The relay supports manual or automatic reset, enabling either hands-on reset after a trip or automatic re-arming per installation, and it delivers Class 10 protection for small three‑phase motors in control panels and motor starters. Designed to integrate with Siemens 3RT-series contactors (3RT2015, 3RT2016, 3RT2017, 3RT2018) to provide a compact, coordinated motor-protection solution, this model’s 3RU2116-1BB0 designation identifies it as an adjustable overload relay tailored to motor loads in 3‑phase systems.