{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB3143-4XW1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB3143-4XW1","canonicalUrl":"https://aoctrl.com/siemens/3RB3143-4XW1","factsUrl":"https://aoctrl.com/api/mcp/products/3RB3143-4XW1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS solid-state overload relay, 3RB3143-4XW1, 115 A thermal current, S3 size, adjustable trip classes 5E/10E/20E/30E, straight-through transformer design.","salesMarkdown":"The Siemens 3RB3143-4XW1 is a SIRIUS solid-state overload relay in the S3 frame size, rated for 115 A thermal current through straight-through transformers. It protects motor circuits by monitoring current and tripping on overload, with adjustable trip classes covering 5E, 10E, 20E, and 30E — so you can match the relay's response to the motor's starting profile and driven load inertia. ## Trip characteristics and setting range The trip mechanism responds when motor current exceeds the upper current setting value times 3.5, and resets when current drops below the lower setting value. With four selectable trip classes, this relay handles everything from quick-protection 5E for short-acceleration motors up to 30E for high-inertia loads that need a longer start window without nuisance tripping. Mounts in any position, standalone installation. Shock-rated at 8 g / 11 ms in normal operation, and the signaling contact (97/98) holds 15 g / 11 ms when tripped — built for industrial vibration environments like conveyor drives or mill tables. The integrated auxiliary switch provides the \"tripped\" message contact. Its switching capacity spans 2 A at 24 V, 4 A at 120 V, 3 A at 230 V, and 0.11 A at 220 V — covers PLC input cards and control relays across common control voltages. Per-pole power dissipation is 0.2 W, negligible for panel thermal budgeting.","metaTitle":"Siemens 3RB3143-4XW1 SIRIUS Solid-State Overload Relay, 115","metaDescription":"Siemens 3RB3143-4XW1 SIRIUS solid-state overload relay, 115 A thermal current, S3 size, adjustable trip classes 5E–30E. Active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Overload Relays"],"specifications":{"Note":"for message \"tripped\"","Depth":"124 mm","Solid":"1x (0.5 ... 4 mm²), 2x (0.5 ... 2.5 mm²)","Width":"70 mm","title":"3RB3143-4XW1","Height":"106 mm","Maximum":"IMotor < upper current setting value x 3.5","Minimum":"IMotor > lower current setting value","at 24 V":"2 A","at 60 V":"0.55 A","Per Pole":"0.2 W","at 110 V":"0.3 A","at 120 V":"4 A","at 125 V":"0.3 A","at 220 V":"0.11 A","at 230 V":"3 A","Trip Class":"CLASS 5E, 10E, 20E and 30E adjustable","Rated Value":"1 000 V","description":"Overload relay 32...115 A Electronic For motor protection Size S3, Class 5E...30E Stand-alone installation Main circuit: Straight-through transformer Auxiliary circuit: Screw Manual-Automatic-Reset","During Storage":"-40 ... +80 °C","Thermal Current":"115 A","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +80 °C","Fastening Method":"stand-alone installation","Shock Resistance":"8g / 11 ms","Mounting Position":"any","Solid Or Stranded":"1x (0,5 ... 4 mm²), 2x (0,5 ... 2,5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"solid-state overload relay","Vibration Resistance":"1-6 Hz, 15 mm; 6-500 Hz, 20 m/s²; 10 cycles","at 480 V rated value":"115 A","at 600 V rated value":"115 A","Size Of Overload Relay":"S3","For Main Current Circuit":"straight-through transformers","Temperature Compensation":"-25 ... +60 °C","Design Of Screwdriver Shaft":"Diameter 5 to 6 mm","Size Of The Screwdriver Tip":"Pozidriv PZ 2","according to IEC 60068-2-27":"15g / 11 ms; Signaling contact 97 / 98 in position \"Tripped\": 8g / 11 ms","at AC-3e rated value maximum":"1 000 V","Substance Prohibitance (Date)":"03/01/2017","Design Of The Auxiliary Switch":"integrated","Design Of The Overload Release":"electronic","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"115 A","for AC motors at 500 V at 50 Hz":"22 ... 75 kW","for AC motors at 690 V at 50 Hz":"30 ... 90 kW","for remote-reset function at DC":"24 V","For Auxiliary And Control Circuit":"screw-type terminals","Between Main And Auxiliary Circuit":"690 V","Relative Humidity During Operation":"10 ... 95 %","With Type Of Assignment 2 Required":"gG: 315 A","Display Version For Switching Status":"Slide switch","Surge Voltage Resistance Rated Value":"8 kV","With Type Of Coordination 1 Required":"gG: 315 A","for 3-phase motors at 400 V at 50 Hz":"18.5 ... 55 kW","Of The Auxiliary And Control Contacts":"M3","for AWG cables for auxiliary contacts":"2x (20 ... 14)","Between Auxiliary And Auxiliary Circuit":"300 V","due to burst according to IEC 61000-4-4":"2 kV (power ports), 1 kV (signal ports) corresponds to degree of severity 3","reference code according to IEC 81346-2":"F","Finely Stranded With Core End Processing":"1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","For Auxiliary Contacts With Screw-Type Terminals":"0.8 ... 1.2 N·m","operational current at AC-3e at 400 V rated value":"115 A","Size Of Contactor Can Be Combined Company-Specific":"S3","electrostatic discharge according to IEC 61000-4-2":"6 kV contact discharge / 8 kV air discharge","Type Of Voltage Supply Via Input/Output Link Master":"No","contact rating of auxiliary contacts according to UL":"B600 / R300","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Response Time Of The Grounding Protection In Settled State":"1 000 ms","Response Value Current Of The Grounding Protection Minimum":"0.75 x IMotor","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gG: 6 A","insulation voltage with degree of pollution 3 at AC rated value":"1 000 V","Product Component Removable Terminal For Auxiliary And Control Circuit":"Yes","power loss [W] for rated value of the current at AC in hot operating state":"0.6 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"32 ... 115 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$162.56","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e573d985c47da8f40ebc92f80d3039b6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629752&mlfb=3RB3143-4XW1"},"ai":{"faq":[{"question":"What does the 'for message tripped' note mean on this relay?","answer":"The note indicates that the auxiliary switch contact (97/98) is dedicated to signaling the tripped state — it closes when the relay has operated on overload, giving a discrete status to a PLC or annunciator."},{"question":"What trip classes can I set on the 3RB3143-4XW1?","answer":"The relay is adjustable for CLASS 5E, 10E, 20E, and 30E — covering fast to slow trip curves to match motor start times and load inertia."},{"question":"What is the depth of the 3RB3143-4XW1?","answer":"The depth is 124 mm, with a width of 70 mm and height of 106 mm — fits standard S3 footprint on the mounting surface."},{"question":"Where can I buy 3RB3143-4XW1 and get current pricing?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at the time of quote — submit an RFQ for a firm price and lead time."},{"question":"What compliance documentation does the 3RB3143-4XW1 carry?","answer":"The relay has a substance prohibitance date of 03/01/2017, indicating RoHS and REACH compliance. The SIRIUS series typically carries UL, CSA, and CE certifications for global panel acceptance."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB3143-4XW1","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/3RB3143-4XW1 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}}