Siemens 3RT2325-1BB40 Contactor

Siemens 3RT2325-1BB40 Contactor is a four-pole power contactor in the 3RT2 family, engineered for AC-1 duty with a nominal load current of up to 35 A at 400 V and a 40 °C ambient rating. The coil is driven by 24 V DC, enabling reliable control from standard automation circuits, with screw-terminal connections and a compact size S0 footprint that fits neatly inside traditional control panels. The unit includes a single auxiliary contact pair consisting of one normally open (NO) and one normally closed (NC), allowing basic signaling or interlock routines alongside the main switching. Main contacts are arranged in four poles to switch three-phase loads, providing clean break and isolation for motors and other inductive equipment. Designed for panel installations where space is at a premium, the 3RT2325-1BB40 balances a compact form factor with robust switching capacity and Siemens' trusted build quality. This model is specifically identified as AC-1 rated, suitable for resistive and lightly inductive loads up to the stated current at 400 VAC, and it carries typical coil/duty characteristics expected of the 3RT2 line. For engineers designing motor control circuits, this 24 V DC coil, 4-pole contactor with NO/NC auxiliary contact offers straightforward wiring and diagnostic capability in a single, space-efficient device.