{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2042-4MB10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2042-4MB10","canonicalUrl":"https://aoctrl.com/siemens/3RV2042-4MB10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2042-4MB10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, motor protection circuit breaker, 3RV2042-4MB10, CLASS 20, screw-type terminals, 100 kA breaking capacity at 400 V AC, for 35 mm DIN rail.","salesMarkdown":"The Siemens SIRIUS 3RV2042-4MB10 is a motor protection circuit breaker designed for the main current circuit, with a CLASS 20 trip characteristic that allows it to ride through motor inrush without nuisance tripping — the right curve for standard induction motors driving pumps, fans, and compressors. Phase failure detection is built in, so it catches a lost phase before the motor cooks. Breaking capacity is 100 kA at 400 V AC — that's the interrupting rating at the panel's line side, meaning it can clear a bolted fault at that level without upstream breakers needing to back it up. At 690 V AC the rating drops to 6 kA, so verify the available fault current at the installation point. Mounts on 35 mm DIN rail per DIN EN 60715, with screw and snap-on fastening. Dimensions are 70 mm wide, 165 mm high, 176 mm deep — fits standard motor control center buckets. Screw-type terminals on the main circuit accept 2x (2.5 to 16 mm²) solid or stranded, or up to 70 mm² on a single conductor. ## Deployment Context Snap-on mounting onto 35 mm DIN rail means it integrates directly into a standard motor control center or panel enclosure — no adapter plate needed. The any-position mounting orientation gives flexibility in tight layouts. Operating temperature range of -20 to +60 °C covers most indoor industrial environments; storage range extends to -50 to +80 °C, which matters for cold-chain or unheated warehouse staging before commissioning.","metaTitle":"Siemens 3RV2042-4MB10 SIRIUS Motor Protection Circuit Breake","metaDescription":"Siemens SIRIUS 3RV2042-4MB10 motor protection circuit breaker, CLASS 20, 100 kA breaking at 400 V AC. Phase failure detection, DIN rail mount. Current lifecycle stage. Sourced to o","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"176 mm","Solid":"2x (2.5 ... 16 mm²)","Width":"70 mm","title":"3RV2042-4MB10","Height":"165 mm","Upwards":"150 mm","Downwards":"150 mm","Trip Class":"CLASS 20","At The Side":"30 mm","Rated Value":"20 ... 690 V","description":"Circuit breaker size S3 for motor protection, Class 20 A-release 80...100 A N-release 1300 A screw terminal Increased switching capacity 100 kA","During Storage":"-50 ... +80 °C","at AC-3 maximum":"15 1/h","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 60715","at AC-3e maximum":"15 1/h","Mounting Position":"any","Solid Or Stranded":"2x (2,5 ... 50 mm²), 1x (10 ... 70 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Circuit breaker","at 230 V rated value":"20 hp","at 240 V rated value":"100 kA","at 400 V rated value":"50 kA","at 480 V rated value":"100 A","at 500 V rated value":"5 kA","at 600 V rated value":"100 A","at 690 V rated value":"3 kA","Design Of The Product":"For motor protection","Ground Fault Detection":"No","Phase Failure Detection":"Yes","For Main Current Circuit":"screw-type terminals","at 110/120 V rated value":"7.5 hp","at 200/208 V rated value":"30 hp","at 220/230 V rated value":"40 hp","at 460/480 V rated value":"75 hp","at 575/600 V rated value":"100 hp","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":"10 kA","at AC at 690 V rated value":"6 kA","Size Of The Circuit-Breaker":"S3","at AC-3 rated value maximum":"690 V","Of The Main Contacts Typical":"25 000","at AC in hot operating state":"44 W","at AC-3 at 400 V rated value":"100 A","at AC-3e rated value maximum":"690 V","Of Auxiliary Contacts Typical":"25 000","Substance Prohibitance (Date)":"03/01/2017","at AC-3e at 400 V rated value":"100 A","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"100 A","Design Of The Short-Circuit Trip":"magnetic","Product Extension Auxiliary Switch":"Yes","Relative Humidity During Operation":"10 ... 95 %","Display Version For Switching Status":"Handle","For Main Contacts For Ring Cable Lug":"4.5 ... 6 N·m","Surge Voltage Resistance Rated Value":"8 kV","at AC in hot operating state per pole":"14.7 W","With Side-By-Side Mounting At The Side":"0 mm","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (2.5 ... 35 mm²), 1x (2.5 ... 50 mm²)","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"Yes","with low demand rate according to SN 31920":"50 %","Finely Stranded Without Core End Processing":"2x (10 ... 35 mm²), 1x (10 ... 50 mm²)","For Main Contacts With Screw-Type Terminals":"4.5 ... 6 N·m","with high demand rate according to SN 31920":"50 %","shock resistance according to IEC 60068-2-27":"25g / 11 ms Sinus","Electrical Endurance (Operating Cycles) Typical":"25 000","Size Of Contactor Can Be Combined Company-Specific":"S3","Outer Diameter Of The Usable Ring Cable Lug Maximum":"19 mm","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","Response Value Current Of Instantaneous Short-Circuit Trip Unit":"1 300 A","insulation voltage with degree of pollution 3 at AC rated value":"1 000 V","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"80 ... 100 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$232.41","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/7f7aca5ea19d99e6e6b7770a617768df.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629981&mlfb=3RV2042-4MB10"},"ai":{"faq":[{"question":"Where can I buy 3RV2042-4MB10 and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current availability and pricing — confirmed at quote time, not listed here."},{"question":"What is the breaking capacity of 3RV2042-4MB10 at 400 V?","answer":"100 kA at 400 V AC — sufficient for high-fault-capacity industrial panels without upstream series rating coordination."},{"question":"Does 3RV2042-4MB10 detect phase failure?","answer":"Yes, phase failure detection is built in, protecting the motor from single-phasing damage."},{"question":"What trip class is 3RV2042-4MB10?","answer":"CLASS 20, meaning it allows up to 20 seconds of overload at 600% of the thermal setting — standard for general-purpose induction motor starting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2042-4MB10","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/3RV2042-4MB10 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}}