Auxiliary contactor, SIRIUS family, size S00
The Siemens 3RH2140-2BE40 is a SIRIUS auxiliary contactor in the size S00 frame — the smallest footprint in the SIRIUS contactor range, suited for control circuits where panel space is tight. It carries 4 normally-open instantaneous contacts, meaning the contacts close immediately when the coil picks up — no built-in delay. This is the configuration for straightforward interlocking, signal feedback, or enabling logic in a motor control center.
DIN-rail mounting and panel spacing
The 73 mm depth and 45 mm width mean it fits a standard 45 mm-wide DIN-rail slot, leaving the 6 mm side gap for airflow and arc-chamber venting.
Lifecycle and compliance documentation
Mechanical service life is 30 million switching cycles typical.
Sourcing and RFQ posture
As a current-production Siemens SIRIUS part, the 3RH2140-2BE40 is quoted to order against the BOM quantity through independent distribution channels. The contactor extension for auxiliary switches is available as a separate add-on, allowing field-configurable contact count beyond the base 4 NO.