3RT2015-1BB44

The 3RT2015-1BB44 is the Siemens SIRIUS 3RT2 series S00 frame 3-pole power contactor with the most complete number of auxiliary contacts. The coil voltage is 24V DC. It shares the same core platform as the most common 1BB41/1BB42, but the difference lies in its built-in 4 sets of auxiliary contacts: 2 normally open (2NO) and 2 normally closed (2NC). This eliminates the need for external auxiliary contact sockets, providing multiple independent signals for operation indication, interlocking, counting, and fault feedback simultaneously. This is particularly practical for applications requiring numerous control logic circuits but limited by distribution box space. It has 3 main contacts, a rated current of 7A, and can load a 3kW/400V motor under AC-3 conditions, with a maximum withstand voltage of 690V AC. It is commonly supplied in the market with suffixes such as 3RT2015-1BB44-3MA0, with the same core coil and contact specifications, differing only slightly in packaging or certification codes.