{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB3143-4XB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB3143-4XB0","canonicalUrl":"https://aoctrl.com/siemens/3RB3143-4XB0","factsUrl":"https://aoctrl.com/api/mcp/products/3RB3143-4XB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RB3143-4XB0 solid-state overload relay, S3 size, 115 A rated thermal current, adjustable trip classes 5E/10E/20E/30E, 70 x 106 x 124 mm, contactor-mount.","salesMarkdown":"## SIRIUS solid-state overload relay, S3 frame, 115 A continuous The 3RB3143-4XB0 is a SIRIUS solid-state overload relay in the S3 size, rated for a thermal current of 115 A at 480 V and 600 V. It mounts directly onto a contactor via the fastening method, saving DIN-rail space in a packed enclosure. Trip class is field-adjustable across CLASS 5E, 10E, 20E and 30E, so you can match the relay's response to the motor start profile — fast trip for short-acceleration loads, slower for high-inertia starts — without swapping hardware. ## Panel fit and termination Footprint is 70 mm wide, 106 mm tall, and 124 mm deep — the S3 frame fits alongside the matching SIRIUS contactor range. The screwdriver spec calls for a PZ2 Pozidriv tip with a 5-6 mm shaft diameter — keep that bit in your panel kit. Storage and transport limits are -40 to +80 °C. Vibration resistance is 1-6 Hz at 15 mm amplitude and 6-500 Hz at 20 m/s² for 10 cycles; shock resistance is 8g for 11 ms on the signaling contact in tripped position. That passes the typical IEC 60068-2-27 profile for industrial cabinet gear. Power dissipation per pole is 1.53 W — at 115 A continuous, three poles generate about 4.6 W total. That's low enough that you don't need forced cooling in a standard IP54 enclosure, but keep it away from heat-sensitive components on the same DIN rail. No stock-holding claim — quoted per RFQ.","metaTitle":"Siemens 3RB3143-4XB0 SIRIUS Solid-State Overload Relay","metaDescription":"Siemens 3RB3143-4XB0 SIRIUS solid-state overload relay, S3 size, 115 A thermal current, adjustable trip classes 5E-30E. Active production, sourced per 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":"3RB3143-4XB0","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":"1.53 W","Stranded":"2x 16 mm²","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 Contactor mounting Main circuit: Screw 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":"Contactor mounting","Shock Resistance":"8g / 11 ms","For Main Contacts":"M6","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":"screw-type terminals","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","at AWG cables for auxiliary contacts":"2x (20 ... 14)","for 3-phase motors at 400 V at 50 Hz":"18.5 ... 55 kW","Of The Auxiliary And Control Contacts":"M3","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","For Main Contacts With Screw-Type Terminals":"4.5 ... 6 N·m","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":"4.6 W","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"32 ... 115 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"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=629750&mlfb=3RB3143-4XB0"},"ai":{"faq":[{"question":"What is the 3RB3143-4XB0 used for?","answer":"It is a solid-state overload relay for motor protection in the SIRIUS range, rated 115 A thermal current with adjustable trip classes 5E, 10E, 20E, and 30E. It mounts directly onto a contactor and protects the motor against overcurrent conditions without the thermal fatigue of bimetallic designs."},{"question":"What does the note 'for message tripped' mean on the 3RB3143-4XB0?","answer":"The note indicates that the relay provides a dedicated signaling contact (terminals 97/98) that changes state when the overload trips. This contact can be wired to a PLC input or annunciator to indicate a tripped condition remotely."},{"question":"How can I order the 3RB3143-4XB0 or check availability?","answer":"No stock-holding claim is made here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB3143-4XB0","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/3RB3143-4XB0 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}}