The Siemens 3RN1011-1CB00 is a thermistor motor protection evaluation unit — it monitors PTC thermistor sensors embedded in motor windings and trips the 1 NO + 1 NC contact set when the winding temperature exceeds the sensor's rated threshold, protecting the motor from thermal overload. Rated for 24 V AC/DC control supply (50/60 Hz), it draws power from a standard 24 V panel bus or transformer. The 22.5 mm wide housing snaps onto DIN rail or screws to a backplate, fitting into a standard control-panel layout without crowding adjacent devices. The unit includes a reclosing lockout function — after a trip, it prevents automatic restart until the motor has cooled and the lockout is manually reset, which is critical for conveyor zones where an unexpected restart could cause jam recovery issues or personnel risk.
For BOM lines still specifying the 3RN1011-1CB00, the part is sourced through independent channels against an RFQ. No last-time-buy window is in effect — the successor is the recommended path for new designs or panel rebuilds.
The 22.5 mm width occupies one standard modular unit, leaving room alongside contactors or relays in a crowded enclosure. Install in a dry, indoor control cabinet.
The substance prohibition date of July 1, 2006 aligns with RoHS compliance — the part is manufactured without the restricted substances listed in the RoHS directive. No separate UL, CSA, or CE mark is listed in the available data; verify local acceptance with the successor part's documentation.