{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RN2012-1BA30","brand":"Siemens","brandSlug":"siemens","productSlug":"3RN2012-1BA30","canonicalUrl":"https://aoctrl.com/siemens/3RN2012-1BA30","factsUrl":"https://aoctrl.com/api/mcp/products/3RN2012-1BA30","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RN2012-1BA30 thermistor motor protection relay, 24 V AC/DC, ATEX approved, 22.5 mm, IP20.","salesMarkdown":"## SIRIUS 3RN2 Thermistor Motor Protection Relay The Siemens SIRIUS 3RN2012-1BA30 is a thermistor motor protection relay designed to monitor motor winding temperature via PTC thermistors, tripping the output when the motor exceeds safe thermal limits. It is a standard evaluation unit with ATEX approval, open-circuit and short-circuit detection in the sensor circuit, and non-volatile error memory. The response threshold is set at 0.85 of the full-scale value, with a release value of 1.1, meaning the relay trips when the thermistor resistance reaches the upper threshold and resets when it drops back below the lower threshold. The output contacts are rated for 1 A at 24 V, 0.2 A at 125 V, and 0.1 A at 250 V. The relay supports auto-reset and external reset functions, and it includes galvanic isolation between the input and output circuits as well as between the outputs. ## Mounting and Environmental Ratings It can be installed in any position, with zero clearance required on all sides (upwards, downwards, forwards, backwards, and at the side). The IP20 protection class allows installation in clean, dry control cabinets. The relay carries ATEX approval for use in potentially explosive atmospheres, and its design includes open-circuit and short-circuit detection in the sensor circuit — a critical feature for safety-instrumented functions where a failed sensor must not mask a motor over-temperature condition. With an MTBF of 97 a and MTTFd of 303 a, the relay offers high reliability for continuous-duty applications. The non-volatile error memory retains the last fault state even after power loss, aiding diagnostics in remote or unattended installations.","metaTitle":"Siemens 3RN2012-1BA30 SIRIUS Thermistor Motor Protection Rel","metaDescription":"Siemens SIRIUS 3RN2012-1BA30 thermistor motor protection relay. Active production, ATEX approved, MTBF 97 a, 22.5 mm wide. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Process / Temperature Controllers"],"specifications":{"MTBF":"97 a","Depth":"90 mm","MTTFd":"303 a","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 250 V":"0.1 A","Backwards":"0 mm","Downwards":"0 mm","auto-RESET":"Yes","At The Side":"0 mm","Rated Value":"24 ... 24 V","Error Memory":"Yes","Initial Value":"0.85","During Storage":"-40 ... +85 °C","External Reset":"Yes","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 ... 24 V","at 60 Hz rated value":"24 ... 24 V","for AWG cables solid":"1x (20 ... 12), 2x (20 ... 14)","Design Of The Product":"Standard evaluation unit with ATEX approval, open-circuit and short-circuit detection in the sensor circuit, non-volatile","Between Input And Output":"Yes","Relative Metering Precision":"2 %","Safe failure fraction (SFF)":"74 %","Substance Prohibitance (Date)":"05/28/2009","Type Of Electrical Connection":"screw-type terminals","Dynamic Open-Circuit Detection":"Yes","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","category according to EN ISO 13849-1":"1","Explosion Protection Category For Gas":"[Ex e] [Ex d] [Ex px]","Explosion Protection Category For Dust":"[Ex t] [Ex p]","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","average diagnostic coverage level (DCavg)":"18 %","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":"No","Type Of Voltage Of The Control Supply Voltage":"AC/DC","hardware fault tolerance according to IEC 61508":"0","vibration resistance according to IEC 60068-2-6":"10 ... 55 Hz: 0.35 mm","PFHD with high demand rate according to EN 62061":"3.76E-7 1/h","At Rate Of Recognizable Hazardous Failures (λDd)":"6.8E-8 1/h","Mechanical Service Life (Operating Cycles) Typical":"10 000 000","PFDavg with low demand rate according to IEC 61508":"0.0041","electrostatic discharge according to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","performance level (PL) according to EN ISO 13849-1":"c","Buffering Time In The Event Of Power Failure Minimum":"40 ms","At Rate Of Non-Recognizable Hazardous Failures (λDu)":"3.08E-7 1/h","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/3RN2012-1BA30/alternatives.json"},"ai":{"faq":[{"question":"What is the MTBF of 3RN2012-1BA30?","answer":"The listed MTBF is 97 a, with an MTTFd of 303 a."},{"question":"What are the key ratings for the output contacts?","answer":"The output contacts are rated 1 A at 24 V, 0.2 A at 125 V, and 0.1 A at 250 V."},{"question":"What is the mounting footprint of this relay?","answer":"It is 22.5 mm wide, 100 mm high, and 90 mm deep, mounting on 35 mm DIN rail with zero clearance on all sides."},{"question":"Does the 3RN2012-1BA30 support auto-reset?","answer":"Yes, it supports both auto-reset and external reset functions."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RN2012-1BA30","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/3RN2012-1BA30 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}}