{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RN2010-1BW30","brand":"Siemens","brandSlug":"siemens","productSlug":"3RN2010-1BW30","canonicalUrl":"https://aoctrl.com/siemens/3RN2010-1BW30","factsUrl":"https://aoctrl.com/api/mcp/products/3RN2010-1BW30","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RN2 thermistor motor protection relay, 3RN2010-1BW30, 24-240 VAC/DC supply, 1 A output at 24 V, auto-reset, IP20, screw and snap-on 35 mm DIN rail.","salesMarkdown":"The Siemens 3RN2010-1BW30 is a SIRIUS 3RN2 thermistor motor protection relay — a standard evaluation unit designed for use with PTC thermistor sensors (bimetallic switches) embedded in motor windings. It monitors motor temperature directly, not just current, so it catches an overheating condition before the winding insulation degrades. The relay accepts a supply voltage of 24 to 240 VAC/DC at 50/60 Hz, making it suitable for global control voltages without a separate transformer. Its output switches up to 1 A at 24 V, 0.2 A at 125 V, or 0.1 A at 250 V — enough to drive a contactor coil or PLC input directly. Auto-reset is enabled by default, so the relay automatically resets when the motor cools below the PTC threshold. If your application requires a manual reset latch to prevent automatic restart after a thermal trip, this unit does not support an external reset input — you would need a variant with that feature. The housing is 22.5 mm wide, 100 mm tall, and 90 mm deep — a standard single-module width that snaps onto 35 mm DIN rail (screw and snap-on mounting). Clearance around the relay: zero mm required upwards, forwards, backwards, downwards, or at the side — it can be butted directly against adjacent devices without derating. This is unusual for a relay and simplifies panel layout. Terminals accept solid or stranded wire from 20 to 12 AWG (1x 20-12, 2x 20-14 for solid). The IP20 finger-safe housing protects personnel during maintenance but is not rated for washdown environments. ## Thermal protection logic and precision The relay triggers a trip when the PTC sensor resistance exceeds the response threshold (initial value 0.85 kΩ, full-scale value 1.1 kΩ). The relative metering precision is 9 %, which means the trip point is repeatable within that band — adequate for motor protection where the thermal time constant is minutes, not seconds. An LED on the front provides local status indication. The relay has no error memory — after a trip and cool-down, it resets automatically (auto-reset enabled) without retaining a fault history. For applications that need a latched alarm, plan for an external memory or a different relay variant. Galvanic isolation exists between input and output, and between the outputs themselves, so the relay can switch a separate control circuit without coupling noise back to the sensor wiring.","metaTitle":"Siemens 3RN2010-1BW30 SIRIUS Thermistor Motor Protection Rel","metaDescription":"Siemens 3RN2010-1BW30 SIRIUS thermistor motor protection relay, 24-240 VAC/DC supply, 1 A output at 24 V, auto-reset, IP20, DIN-rail mount. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Process / Temperature Controllers"],"specifications":{"Depth":"90 mm","Solid":"20 ... 12","Width":"22.5 mm","Height":"100 mm","Upwards":"0 mm","at 24 V":"1 A","Forwards":"0 mm","Stranded":"20 ... 12","at 125 V":"0.2 A","at 240 V":"0.2 ms","at 250 V":"0.1 A","Backwards":"0 mm","Downwards":"0 mm","auto-RESET":"Yes","At The Side":"0 mm","Rated Value":"24 ... 240 V","Error Memory":"No","Initial Value":"0.85","During Storage":"-40 ... +85 °C","External Reset":"No","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +85 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail","Full-Scale Value":"1.1","Product Category":"SIRIUS 3RN2 thermistor motor protection","Product Function":"thermistor motor protection","Mounting Position":"any","Product Brand Name":"SIRIUS","Between The Outputs":"Yes","Degree Of Pollution":"3","Product Designation":"Thermistor motor protection relay","display version LED":"Yes","protection class IP":"IP20","at 50 Hz rated value":"24 ... 240 V","at 60 Hz rated value":"24 ... 240 V","for AWG cables solid":"1x (20 ... 12), 2x (20 ... 14)","Design Of The Product":"Standard evaluation unit, suitable for bimetallic switch","Between Input And Output":"Yes","Relative Metering Precision":"9 %","Substance Prohibitance (Date)":"05/28/2009","Type Of Electrical Connection":"screw-type terminals","Dynamic Open-Circuit Detection":"No","Material Of Switching Contacts":"AgSnO2","Operating Frequency Rated Value":"50 ... 60 Hz","For Auxiliary And Control Circuit":"screw-type terminals","Design Of The Electrical Isolation":"galvanic isolation","Relative Humidity During Operation":"70 %","Surge Voltage Resistance Rated Value":"4 kV","due to burst according to IEC 61000-4-4":"2 kV (power ports) / 1 kV (signal ports)","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"0.5 ... 4 mm²","Tightening Torque With Screw-Type Terminals":"0.6 ... 0.8 N·m","number of CO contacts for auxiliary contacts":"2","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"0","shock resistance according to IEC 60068-2-27":"11g / 15 ms","Between The Voltage Supply And Other Circuits":"Yes","Type Of Voltage Of The Control Supply Voltage":"AC/DC","vibration resistance according to IEC 60068-2-6":"10 ... 55 Hz: 0.35 mm","Mechanical Service Life (Operating Cycles) Typical":"10 000 000","electrostatic discharge according to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","Buffering Time In The Event Of Power Failure Minimum":"40 ms","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Thermal Current Of The Switching Element With Contacts Maximum":"5 A","continuous current of the DIAZED fuse link of the output relay":"6 A","Product Component Removable Terminal For Auxiliary And Control Circuit":"Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/3RN2010-1BW30/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of the 3RN2010-1BW30?","answer":"The depth is 90 mm, with a width of 22.5 mm and height of 100 mm."},{"question":"What wire sizes does the 3RN2010-1BW30 accept?","answer":"Solid wire: 1x 20-12 AWG or 2x 20-14 AWG. Stranded wire: 20-12 AWG."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RN2010-1BW30","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RN2010-1BW30 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}