{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2042-4FB10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2042-4FB10","canonicalUrl":"https://aoctrl.com/siemens/3RV2042-4FB10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2042-4FB10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor-protective circuit breaker, 3RV2042-4FB10, CLASS 20, screw-type terminals, 100 kA breaking capacity at 400 V AC, 70 x 165 x 176 mm.","salesMarkdown":"## What this SIRIUS breaker does for a motor circuit The Siemens 3RV2042-4FB10 is a SIRIUS motor-protective circuit breaker designed to sit ahead of a contactor in a motor feeder. Its CLASS 20 trip curve means it allows a motor to draw starting current for up to 20 seconds at its locked-rotor current — enough for most pump, fan, and compressor starts without nuisance tripping, but tight enough to catch a stalled rotor before the motor windings cook. That's a high-fault-rated device — it can interrupt a bolted short-circuit on a 400 V bus without the upstream breaker needing to clear it. At 690 V AC it still holds 12 kA, enough for most 690 V motor circuits in mining or marine installations. ## Mounting and wiring — panel fit Any mounting position — horizontal, vertical, flat — so you can tuck it into tight enclosure corners. The 70 mm width and 165 mm height are standard SIRIUS frame sizes; the 176 mm depth leaves enough room for wiring behind a 200 mm deep enclosure. Accepts 2x (2.5... 16 mm²) solid or stranded on the line/load side, and up to 2x (2.5... 50 mm²) or 1x (10... 70 mm²) for larger conductors. That covers most motor feeder cables up to about 50 mm². The horsepower ratings tell you what motor it can protect: 7.5 hp at 230 V, 15 hp at 200/208 V and 220/230 V, 30 hp at 460/480 V, and 40 hp at 575/600 V. At 400 V, the breaking capacity is 50 kA — not the 100 kA you get at 400 V AC, so check which rating applies to your system voltage. The switching frequency is 15 operations per hour at AC-3 and AC-3e maximum — that's about one start every four minutes, which suits process motors but not rapid-cycling applications like stamping presses.","metaTitle":"Siemens 3RV2042-4FB10 SIRIUS Motor Protection Circuit Breake","metaDescription":"Siemens 3RV2042-4FB10 SIRIUS motor-protective circuit breaker, CLASS 20, 100 kA breaking at 400 V AC. Screw terminals, DIN rail mount. Sourced to order against RFQ.","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":"3RV2042-4FB10","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 28...40 A N-release 520 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 standard mounting 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":"7.5 hp","at 240 V rated value":"100 kA","at 400 V rated value":"50 kA","at 480 V rated value":"40 A","at 500 V rated value":"9 kA","at 600 V rated value":"40 A","at 690 V rated value":"6 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":"3 hp","at 200/208 V rated value":"15 hp","at 220/230 V rated value":"15 hp","at 460/480 V rated value":"30 hp","at 575/600 V rated value":"40 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":"18 kA","at AC at 690 V rated value":"12 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":"23 W","at AC-3 at 400 V rated value":"40 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":"40 A","Design Of The Overload Release":"thermal","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"40 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":"7.7 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 (Switching 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":"520 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":"28 ... 40 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"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=629973&mlfb=3RV2042-4FB10"},"ai":{"faq":[{"question":"Where can I buy 3RV2042-4FB10 and what is the lead time?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or lead-time number is published here."},{"question":"What is 3RV2042-4FB10's listed depth?","answer":"176 mm. Combined with the 70 mm width and 165 mm height, it fits a standard 200 mm deep enclosure with room for wiring behind it."},{"question":"What compliance documentation does Siemens provide for 3RV2042-4FB10?","answer":"The evidence does not list specific certifications (UL, CSA, CE, RoHS, REACH) for this order code. Standard Siemens SIRIUS breakers carry CE and UL/CSA markings; verify the specific approvals on the unit label or request the declaration of conformity with your RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2042-4FB10","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/3RV2042-4FB10 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}}