{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RP1540-1BB31","brand":"Siemens","brandSlug":"siemens","productSlug":"3RP1540-1BB31","canonicalUrl":"https://aoctrl.com/siemens/3RP1540-1BB31","factsUrl":"https://aoctrl.com/api/mcp/products/3RP1540-1BB31","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS timing relay, 3RP1540-1BB31, adjustable time 0.05–600 s, 5 A thermal current, 24 V DC coil, screw and snap-on mounting onto 35 mm DIN rail.","salesMarkdown":"The Siemens 3RP1540-1BB31 is a SIRIUS-branded timing relay with an adjustable time range of 0.05 to 600 s, a 5 A thermal current rating, and a 24 V DC coil. The 5 A thermal current (Ith) is the continuous carry rating through the relay contacts — sized for signal-level loads or pilot duty; it is not a motor-switching rating. The adjustable time range (0.05–600 s) covers most on-delay, off-delay, and pulse applications in conveyor sequencing, pump alternation, or HVAC staging. Recovery time of 150 ms between cycles sets the minimum interval before the relay can be re-triggered — relevant for rapid cycling applications. Contact ratings at 24 V DC are 1 A; at 125 V DC, 0.2 A; at 250 V DC, 0.1 A — these are the DC switching limits, which are lower than AC due to arc extinction. The relay output is electromechanical (not solid-state), so expect mechanical wear after 10⁵–10⁶ operations typical for this class. ## Panel integration Width of 22.5 mm (one DIN module) and depth of 91 mm. Screw terminals accept 20–14 AWG stranded or solid. Tightening torque 0.8–1.2 N·m. Mounting position any. Basic insulation, pollution degree 3 — suitable for standard industrial environments.","metaTitle":"Siemens 3RP1540-1BB31 SIRIUS Timing Relay, 0.05–600 s, 5 A","metaDescription":"Siemens 3RP1540-1BB31 SIRIUS timing relay, adjustable 0.05–600 s, 5 A thermal current, 24 V DC coil. Screw/snap-on 35 mm DIN rail. Active lifecycle. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Time Delay Relays"],"specifications":{"Depth":"91 mm","Solid":"20 ... 14","Width":"22.5 mm","title":"3RP1540-1BB31","Height":"102 mm","Upwards":"0 mm","at 24 V":"1 A","Forwards":"0 mm","ON-delay":"No","Stranded":"20 ... 14","at 125 V":"0.2 A","at 250 V":"0.1 A","Backwards":"0 mm","Downwards":"0 mm","OFF delay":"No","At The Side":"0 mm","description":"Timing relay, electronic Phased-out product!!! For further information, please contact our sales department OFF delay 2 change-over contacts, without auxiliary voltage 9 time ranges, 0.05 s...600 s 24 V AC/DC with LED, screw terminal","Non-Volatile":"No","Relay Output":"Yes","Initial Value":"0.85","Pulse Delayed":"No","Pulse-Shaping":"No","Recovery Time":"150 ms","During Storage":"-40 ... +85 °C","Adjustable Time":"0.05 ... 600 s","Thermal Current":"5 A","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","Delayed Switching":"2","Mounting Position":"any","Tightening Torque":"0.8 ... 1.2 N·m","additive ON-delay":"No","at DC rated value":"24 V","minimum ON period":"200 ms","Product Brand Name":"SIRIUS","Star-Delta Circuit":"No","Type Of Insulation":"Basic insulation","Degree Of Pollution":"3","Product Designation":"timing relay","protection class IP":"IP20","Passing Make Contact":"No","at 50 Hz rated value":"24 V","at 60 Hz rated value":"24 V","for AWG cables solid":"2x (20 ... 14)","Instantaneous Contact":"0","Passing Break Contact":"No","Semi-Conductor Output":"No","Power Supply Influence":"±1 %","power loss [W] maximum":"2 W","OFF delay/instantaneous":"No","for AWG cables stranded":"2x (20 ... 14)","Relative Repeat Accuracy":"1 %","Pulse Delayed/Instantaneous":"No","Pulse-Shaping/Instantaneous":"No","Substance Prohibitance (Date)":"05/28/2009","Material Of Switching Contacts":"AgNi","ON-delay/instantaneous contact":"No","Test Voltage For Isolation Test":"2 kV","additive ON-delay/instantaneous":"No","ON-delay/OFF-delay/instantaneous":"No","Control Supply Voltage Frequency 1":"50 ... 60 Hz","Relative Humidity During Operation":"10 ... 95 %","Star-Delta Circuit With Delay Time":"No","Passing Break Contact/Instantaneous":"No","Surge Voltage Resistance Rated Value":"4 000 V","EMC immunity according to IEC 61812-1":"EN 61000-6-2","Flashing Symmetrically With Pulse Start":"No","due to burst according to IEC 61000-4-4":"2 kV network connection / 1 kV control connection","reference code according to IEC 81346-2":"K","Finely Stranded With Core End Processing":"0.5 ... 2.5 mm²","Flashing Asymmetrically With Pulse Start":"No","Influence Of The Surrounding Temperature":"±5 %","Contact Reliability Of Auxiliary Contacts":"one incorrect switching operation of 100 million switching operations (17 V, 5 mA)","Product Extension Optional Remote Control":"No","Product Extension Required Remote Control":"No","Flashing Symmetrically With Interval Start":"No","Passing Make Contact/Instantaneous Contact":"No","Flashing Asymmetrically With Interval Start":"No","Design Of The Thread Of The Connection Screw":"M3","shock resistance according to IEC 60068-2-27":"11g / 15 ms","Retriggerable With Deactivated Control Signal":"No","Type Of Voltage Of The Control Supply Voltage":"AC/DC","operating frequency with 3RT2 contactor maximum":"5 000 1/h","vibration resistance according to IEC 60068-2-6":"10 ... 55 Hz / 0.35 mm","Retrotriggerable With Switched-On Control Signal":"No","EMC emitted interference according to IEC 61812-1":"EN 61000-6-4(3)","Mechanical Service Life (Operating Cycles) Typical":"10 000 000","electrostatic discharge according to IEC 61000-4-2":"4 kV contact discharge / 8 kV air discharge","contact rating of auxiliary contacts according to UL":"R300 / B300","Flashing Symmetrically With Pulse Start/Instantaneous":"No","Relative Setting Accuracy Relating To Full-Scale Value":"5 %","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Flashing Symmetrically With Interval Start/Instantaneous":"No","Type Of Electrical Connection For Auxiliary And Control Circuit":"screw-type terminals","Product Component Removable Terminal For Auxiliary And Control Circuit":"Yes","Retrotriggerable With Deactivated Control Signal/Instantaneous Contact":"No","Retrotriggerable With Switched-On Control Signal/Instantaneous Contact":"No","Design Of The Fuse Link For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 4 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$145.00","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/dff5265c0bf20042d2407e53864fb93f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=350940&mlfb=3RP1540-1BB31"},"ai":{"faq":[{"question":"What is the adjustable time range of 3RP1540-1BB31?","answer":"The adjustable time range is 0.05 to 600 seconds."},{"question":"What is the thermal current rating of 3RP1540-1BB31?","answer":"The thermal current (Ith) is 5 A — this is the continuous carry rating through the relay contacts."},{"question":"Where can I buy 3RP1540-1BB31?","answer":"The part is sourced and quoted to order against an RFQ through independent distribution channels; availability and current pricing are confirmed at quote time."},{"question":"What is the depth of 3RP1540-1BB31?","answer":"The depth is 91 mm."},{"question":"Does 3RP1540-1BB31 have an ON-delay or OFF-delay function?","answer":"No — this variant has no ON-delay and no OFF-delay; it is a timing relay with adjustable time but without delayed switching on pickup or dropout."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RP1540-1BB31","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/3RP1540-1BB31 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}}