{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1042-4FB10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1042-4FB10","canonicalUrl":"https://aoctrl.com/siemens/3RV1042-4FB10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1042-4FB10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV1042-4FB10 motor-protective circuit breaker, 40 A continuous, CLASS 20, 100 kA breaking capacity at 400 V AC, phase failure detection, screw terminals, IP20 front, DIN rail mount.","salesMarkdown":"## SIRIUS motor-protective circuit breaker, 40 A, CLASS 20 The Siemens 3RV1042-4FB10 is a SIRIUS motor-protective circuit breaker designed for motor protection, rated at 40 A continuous current with a CLASS 20 trip characteristic — meaning it allows a 20-second overload at 7.2× rated current before tripping, matching the thermal time constant of standard induction motors. It carries an 18.5 kW motor rating at 400 V AC and delivers 100 kA breaking capacity at 400 V, so it can safely clear a high-fault bolted short without upstream coordination gymnastics. Breaking capacity is 100 kA at 240 V and 400 V AC, dropping to 18 kA at 500 V and 12 kA at 690 V. Main current circuit uses screw-type box terminals. Solid conductors: 2x (2.5 to 16 mm²). Stranded: 2x (10 to 50 mm²) or 1x (10 to 70 mm²). Finely stranded with ferrule: 2x (2.5 to 35 mm²) or 2.5 to 50 mm². AWG equivalents: 2x (10 to 1) or 1x (10 to 2). That range covers most motor feeder cables up to 70 mm² — plenty for a 40 A circuit. Auxiliary and control circuit terminals are also screw-type. An auxiliary switch can be added via the product extension. Mounting position is any. Zero clearance required backwards and at the sides — no derating for side-by-side installation on the rail. Shock resistance 25g for 11 ms. Dimensions: 70 mm wide, 165 mm high, 174 mm deep. That 174 mm depth is the body depth behind the panel — check it clears the enclosure depth before wiring.","metaTitle":"Siemens 3RV1042-4FB10 SIRIUS Motor Protective Circuit Breake","metaDescription":"Siemens 3RV1042-4FB10 SIRIUS motor-protective circuit breaker, 40 A continuous, CLASS 20, 100 kA breaking at 400 V. Phase failure detection, IP20 front, DIN rail mount. Sourced to","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"174 mm","Solid":"2x (2.5 ... 16 mm²)","Width":"70 mm","Height":"165 mm","Stranded":"2x (10 ... 50 mm²), 1x (10 ... 70 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 standard mounting 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":"100 kA","at AC at 500 V rated value":"18 kA","at AC at 690 V rated value":"12 kA","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"23 W","Substance Prohibitance (Date)":"07/01/2006","Continuous Current Rated Value":"40 A","at AWG cables for main contacts":"2x (10 ... 1), 1x (10 ... 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":"7.7 W","Finely Stranded With Core End Processing":"2x (2.5 ... 35 mm²), 2.5 ... 50 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=257618&mlfb=3RV1042-4FB10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1042-4FB10/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RV1042-4FB10 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ to confirm availability and current pricing — no stock or price figures are published here."},{"question":"What is the breaking capacity of 3RV1042-4FB10 at 400 V?","answer":"100 kA at 400 V AC — sufficient for high-fault industrial buses without upstream fusing."},{"question":"What compliance documentation does Siemens provide for 3RV1042-4FB10?","answer":"The part carries a substance prohibitance date of 07/01/2006, indicating RoHS compliance. Standard Siemens documentation includes the datasheet, CE declaration, and UL/CSA file information — available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1042-4FB10","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/3RV1042-4FB10 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}}