{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1342-4FC10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1342-4FC10","canonicalUrl":"https://aoctrl.com/siemens/3RV1342-4FC10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1342-4FC10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker for starter combinations, 3RV1342-4FC10, 40 A continuous rated current, 100 kA breaking capacity at 400 V AC, screw-type terminals, DIN rail mount.","salesMarkdown":"## SIRIUS 3RV1342-4FC10 — Motor Circuit Breaker for Starter Combinations The Siemens SIRIUS 3RV1342-4FC10 is a 40 A continuous-rated circuit breaker for starter combinations. It integrates directly with a contactor to form a coordinated motor starter pair. Zero clearance required backwards and at the side — you can butt it against adjacent devices without derating for airflow. Any mounting position is acceptable, which helps in tight enclosures where rail orientation is fixed. Main circuit terminals are screw-type with box terminals, accepting solid conductors 2x (2.5...16 mm²) and stranded 2x (10...50 mm²) or 1x (10...70 mm²). Auxiliary and control circuit terminals are also screw-type. The part supports an auxiliary switch — order separately. Wire range covers most panel wiring up to 70 mm² on the main circuit, which is generous for a 40 A device. 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. At 400 V — the most common industrial voltage — the 100 kA figure means this breaker can be used on high-fault-capacity panels without requiring upstream current-limiting fuses. The rated impulse withstand voltage is 6 kV, and touch protection is finger-safe.","metaTitle":"Siemens 3RV1342-4FC10 SIRIUS Circuit Breaker, 40 A, 100 kA a","metaDescription":"Siemens SIRIUS 3RV1342-4FC10 circuit breaker for starter combinations. 40 A continuous, 100 kA breaking capacity at 400 V AC. DIN rail mount. Active production. Quoted to order.","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","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 starter combinations","Ground Fault Detection":"No","Phase Failure Detection":"No","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":"magnetic","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"}},"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=247698&mlfb=3RV1342-4FC10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1342-4FC10/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes does 3RV1342-4FC10 accept?","answer":"Solid conductors: 2x (2.5...16 mm²). Stranded: 2x (10...50 mm²) or 1x (10...70 mm²). AWG equivalents: 2x (10...1) solid, 1x (10...2)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1342-4FC10","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/3RV1342-4FC10 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}}