{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RS2900-1AW30","brand":"Siemens","brandSlug":"siemens","productSlug":"3RS2900-1AW30","canonicalUrl":"https://aoctrl.com/siemens/3RS2900-1AW30","factsUrl":"https://aoctrl.com/api/mcp/products/3RS2900-1AW30","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RS2900-1AW30 temperature monitoring relay, 24-240 V AC/DC, 2 resistivity sensor inputs, 4-20 mA analog input, status relay, IP20, screw and snap-on mounting on 35 mm DIN rail.","salesMarkdown":"The Siemens 3RS2900-1AW30 is a SIRIUS temperature monitoring relay — a sensor extension module designed to accept up to two additional resistivity sensors (like Pt100 RTDs) plus a 4-20 mA analog input, then drive a status relay based on the programmed thresholds. The status relay contacts are rated 1 A at 24 V DC, 0.2 A at 125 V DC, and 0.1 A at 250 V DC — these are the maximum switching currents at those voltages, not continuous carry. If you're driving a contactor coil or a small solenoid, verify the inrush doesn't exceed these DC limits; for AC loads, the relay is switching the same 24-240 V range it's powered from. The relative metering precision is 1 % of full scale, with a full-scale value of 1.1 and an initial value of 0.85. That means it belongs inside a control cabinet, not on the machine frame exposed to washdown or coolant mist. Mounting position is any, which helps when panel layout is tight. The switching behavior is monostable — the relay drops out when the monitored temperature returns below the threshold. An error memory is available (settable), and an external reset input is present, so you can latch the alarm until manually acknowledged if the application demands it. Terminals accept solid wire 20-12 AWG (1x) or 20-14 AWG (2x), and stranded 20-12 AWG. Isolation between input and output is provided, which is critical when the sensor loop shares a cabinet with motor drives or switching power supplies — it prevents ground loops from coupling noise into the measurement. ## Environmental limits The 60 °C upper operating limit is fine for most ventilated cabinets; if the panel sits near a heat source (drive heatsink, transformer), check the internal ambient doesn't exceed that. Clearance requirements are zero in all directions (upwards, downwards, forwards, backwards, at the side) — meaning it can be mounted flush against adjacent devices without derating, which simplifies high-density panel layouts.","metaTitle":"Siemens 3RS2900-1AW30 SIRIUS Temperature Monitoring Relay, 2","metaDescription":"Siemens 3RS2900-1AW30 SIRIUS temperature monitoring relay. Current production. 24-240V AC/DC supply. 2 resistivity sensor inputs, 4-20mA analog input. IP20. DIN rail mount.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Time Delay Relays"],"specifications":{"Depth":"90 mm","Solid":"20 ... 12","Width":"22.5 mm","at DC":"24 ... 240 V","title":"3RS2900-1AW30","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","at 50 Hz":"24 ... 240 V","at 60 Hz":"24 ... 240 V","Backwards":"0 mm","Downwards":"0 mm","At The Side":"0 mm","description":"Sensor extension module for 3RS26/8 Temperature monitoring relay, 2 sensors, sensor status relay, analog input, 22.5 mm width, 24 - 240 V AC/DC screw terminals","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 Function":"temperature monitoring","Mounting Position":"any","at DC rated value":"24 V","Product Brand Name":"SIRIUS","Switching Behavior":"monostable","Degree Of Pollution":"3","Product Designation":"Sensor extension module","at AWG cables solid":"1x (20 ... 12), 2x (20 ... 14)","display version LED":"Yes","protection class IP":"20","at 50 Hz rated value":"24 V","at 60 Hz rated value":"24 V","Design Of The Product":"2 additional resistivity sensors, analog input 4 ... 20 mA, ATEX via analog input, status relay","Between Input And Output":"Yes","Relative Metering Precision":"1 %","Safe failure fraction (SFF)":"66 %","Number Of Measuring Circuits":"3","Substance Prohibitance (Date)":"05/01/2012","Type Of Electrical Connection":"screw-type terminals","Material Of Switching Contacts":"AgSnO2","sensor current with KTY-sensor":"0.33 mA","Operating Frequency Rated Value":"50 ... 60 Hz","Test Voltage For Isolation Test":"4 kV","Design Of The Sensor Connectable":"Resistance sensors: Pt100, Pt1000, KTY83-110, KTY84, NTC","For Auxiliary And Control Circuit":"screw-type terminals","Design Of The Electrical Isolation":"galvanic isolation","Relative Humidity During Operation":"70 %","category according to EN ISO 13849-1":"1","Explosion Protection Category For Gas":"Ex II (2) G [b1] [Ex h] [db] [eb] [pyb] [mb] [ob] [q] [kb] [sb] II C Gb","Explosion Protection Category For Dust":"Ex II (2) D [b1] [Ex h] [pyb] [tb] [mb] [kb] [sb] III C Db","protocol is supported IO-Link protocol":"No","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","Influence Of The Surrounding Temperature":"0.05% per K deviation from T20","control supply voltage at DC rated value":"24 ... 240 V","Contact Reliability Of Auxiliary Contacts":"one incorrect switching operation of 100 million switching operations (17 V, 5 mA)","Tightening Torque With Screw-Type Terminals":"0.6 ... 0.8 N·m","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"1","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","measurable temperature with KTY-sensor maximum":"300 °C","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":"2.9E-7 1/h","EMC emitted interference according to IEC 60947-1":"Class B","SIL Claim Limit (subsystem) according to EN 62061":"1","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","performance level (PL) according to EN ISO 13849-1":"c","Buffering Time In The Event Of Power Failure Minimum":"20 ms","contact rating of auxiliary contacts according to UL":"R300 / B300","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Supply Voltage Frequency For Auxiliary And Control Circuit":"50 ... 60 Hz","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","continuous current of DIAZED fuse link of the output relay safety-related":"2 A","for short circuit protection of the NC contacts of the relay outputs required":"gL/gG: 6 A or MCB type C: 1 A","for short-circuit protection of the NO contacts of the relay outputs required":"gL/gG: 6 A or MCB type C: 1 A","for short circuit protection of the NC contacts of the relay outputs safety-related required":"gL/gG: 2 A or MCB type C: 1 A","for short-circuit protection of the NO contacts of the relay outputs safety-related required":"gL/gG: 2 A or MCB type C: 1 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$352.00","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/42ea662e18fb113083ebfc781087143d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1361966&mlfb=3RS2900-1AW30"},"ai":{"faq":[{"question":"What compliance documentation is available for this part?","answer":"The evidence does not list specific compliance certifications (UL, CSA, CE, RoHS, REACH) for this order code. The part carries the SIRIUS brand and is designed to degree of pollution 3 standards typical for industrial control equipment. For formal compliance documentation, this is best confirmed against the specific project requirements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RS2900-1AW30","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/3RS2900-1AW30 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}