The Siemens SIRIUS 3RU5156-2XB2 is a thermal overload relay rated 80-110 A in size S6, Class 10 trip curve, for three-phase motor protection. It mounts directly to a contactor or standalone on a DIN rail, protecting the motor branch from sustained overcurrents by simulating the motor's thermal response.
The 80-110 A setting range covers motor FLA from 80 A up to 110 A, so it pairs with contactors and motors in that current band — typically 45-55 kW at 400 V depending on duty. The 3-pole main circuit matches standard three-phase motor feeds. Surge voltage resistance of 8 kV on the main circuit means it withstands switching transients common in industrial panels without flashover. The auxiliary circuit uses screw terminals, same as the main circuit — no need for separate tooling on the control wiring.
Lifecycle stage is marked as current, meaning Siemens still produces this relay as an active catalog item. No phase-out or last-time-buy notice is attached to this order code. The RoHS compliance date of 09/03/2013 confirms it meets EU substance restrictions for current builds.
Environmental and handling limits
Storage temperature spans -55 to +80 °C, which covers most warehouse and shipping conditions. Operating humidity range of 0 to 90 % suits non-condensing environments inside a standard IP54 or better enclosure. The relay operates on 50/60 Hz supply — no frequency derating needed between the two.