{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1031-4FB10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1031-4FB10","canonicalUrl":"https://aoctrl.com/siemens/3RV1031-4FB10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1031-4FB10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker, 3RV1031-4FB10, 40 A continuous, Class 20, 18.5 kW at 400 V, 50 kA breaking capacity, screw terminals, DIN rail mount.","salesMarkdown":"The Siemens SIRIUS 3RV1031-4FB10 is a three-pole motor protection circuit breaker rated for 40 A continuous current with Trip Class 20, sized for a 3-phase motor load up to 18.5 kW at 400 V. It snaps onto a 35 mm DIN rail per DIN EN 50022 and terminates via screw-type box terminals on the main circuit, accepting solid conductors 2x (0.75... 16 mm²) or stranded 2x (0.75... 25 mm²). Breaking capacity drops with system voltage: 100 kA at 240 V AC, 50 kA at 400 V AC, 10 kA at 500 V AC, and 4 kA at 690 V AC. At 400 V the 50 kA rating covers most industrial service-entrance fault levels; at 690 V the 4 kA figure still clears a low-impedance fault but demands upstream coordination — check selectivity with the feeding MCCB or fuse. ## Trip class and protection features ## Power dissipation and thermal management At full load in hot operating state the breaker dissipates 29 W total, 9.7 W per pole. In a crowded DIN-rail enclosure that heat adds up — allow natural convection or forced airflow if multiple units sit side by side with zero side clearance (the evidence lists 0 mm backwards and side clearance). Submit an RFQ for current pricing and availability — the 40 A Class 20 rating and 18.5 kW at 400 V make it a direct fit for motor-protection BOM lines in that power band.","metaTitle":"Siemens 3RV1031-4FB10 SIRIUS Motor Protection Circuit Breake","metaDescription":"Siemens 3RV1031-4FB10 SIRIUS motor protection circuit breaker, 40 A continuous, Class 20, 18.5 kW at 400 V, 50 kA breaking capacity. Current lifecycle. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"149 mm","Solid":"2x (0.75 ... 16 mm²)","Width":"55 mm","Height":"140 mm","Stranded":"2x (0.75 ... 25 mm²), 1x (0.75 … 35 mm²)","Backwards":"0 mm","Trip Class":"CLASS 20","At The Side":"0 mm","Rated Value":"690 V","During Storage":"-50 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","During Transport":"-50 ... +80 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 50022","Shock Resistance":"25g / 11 ms","Mounting Position":"any","Product Brand Name":"SIRIUS","Product Designation":"circuit breaker","at 400 V rated value":"18.5 kW","Design Of The Product":"for motor protection","Ground Fault Detection":"No","Phase Failure Detection":"Yes","For Main Current Circuit":"screw-type terminals with box terminals","at AC at 240 V rated value":"100 kA","at AC at 400 V rated value":"50 kA","at AC at 500 V rated value":"10 kA","at AC at 690 V rated value":"4 kA","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"29 W","Substance Prohibitance (Date)":"07/01/2006","Continuous Current Rated Value":"40 A","at AWG cables for main contacts":"2x (18 ... 2), 1x (18 ... 2)","protection class IP on the front":"IP20","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","operating frequency at AC-3 maximum":"15 1/h","Surge Voltage Resistance Rated Value":"6 000 V","at AC in hot operating state per pole":"9.7 W","Finely Stranded With Core End Processing":"2x (0.75 ... 16 mm²), 0.75 ... 25 mm²","Number Of Poles For Main Current Circuit":"3","Touch Protection Against Electrical Shock":"finger-safe","number of CO contacts for auxiliary contacts":"0","operational current at AC-3 at 400 V rated value":"40 A","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Design Of The Overcurrent Release And Short-Circuit Release":"thermomagnetic","Arrangement Of Electrical Connectors For Main Current Circuit":"front side","Product Component Removable Terminal For Auxiliary And Control Circuit":"No","Mechanical Service Life (Switching Cycles) Of The Main Contacts Typical":"50 000","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"28 ... 40 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=75771&mlfb=3RV1031-4FB10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1031-4FB10/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RV1031-4FB10?","answer":"The 3RV6021-4DA10 is a peer in the same SIRIUS family but carries different ratings — verify your motor FLA and voltage before substituting. The 3RV1031-4FB10 is rated 40 A, Class 20, 18.5 kW at 400 V; the 3RV6021-4DA10 has a different current rating and trip class. A direct drop-in without rewiring is not guaranteed."},{"question":"What compliance documentation does Siemens provide for 3RV1031-4FB10?","answer":"RoHS compliance is confirmed with a substance prohibitance date of 07/01/2006. The part carries IP20 front protection. For UL, CSA, or IEC certificates, request the manufacturer's declaration with your RFQ."},{"question":"Where can I buy 3RV1031-4FB10 and how is it quoted?","answer":"The 3RV1031-4FB10 is sourced to order against an RFQ through independent distribution. Submit a request for current pricing and lead time — availability is confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1031-4FB10","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/3RV1031-4FB10 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}}