{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2142-4FA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2142-4FA10","canonicalUrl":"https://aoctrl.com/siemens/3RV2142-4FA10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2142-4FA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor protection circuit breaker, 3RV2142-4FA10, for motor protection with overload relay function, CLASS 10 trip, screw terminals, 50 kA breaking capacity at 400 V.","salesMarkdown":"The CLASS 10 trip characteristic means it will trip within 10 seconds at 7.2× the thermal setting current, which is the standard for standard-duty induction motor starting (pumps, fans, compressors) where the start time stays under about 6 seconds. No ground-fault detection here — that is handled separately downstream if the installation requires it. ## Breaking capacity and SCCR coordination At 400 V the 3RV2142-4FA10 is rated for 50 kA breaking capacity. For a 480 V system the rating drops to 40 A (the continuous current, not the breaking capacity — the interrupting rating at 480 V is not separately stated in this listing, so verify coordination with the upstream fuse or breaker). The horsepower ratings across common motor voltages are: 3 hp at 110/120 V, 15 hp at 200/208 V and 220/230 V, 7.5 hp at 230 V, 30 hp at 460/480 V, and 40 hp at 575/600 V. These are the full-load motor sizes this breaker can protect at those line voltages. Mounting position is any, which helps in crowded enclosures. The clearance requirements: 150 mm above and below, 30 mm to the side, 0 mm forward and backward. That 150 mm vertical clearance is for arc-gas venting and heat dissipation; pack it tighter and you derate the interrupting capacity. Wire terminals are screw-type for the main circuit, accepting 2x (2.5 to 16 mm²) solid or stranded, or 1x (10 to 70 mm²) for larger feeds. The depth is 176 mm, width 90 mm, height 165 mm — factor that into the enclosure depth and door clearance if a rotary handle is added.","metaTitle":"Siemens 3RV2142-4FA10 SIRIUS Motor Protection Circuit Breake","metaDescription":"Siemens 3RV2142-4FA10 SIRIUS motor protection circuit breaker with overload relay, CLASS 10 trip, 50 kA breaking at 400 V. Current production. Sourced to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Note":"1","Depth":"176 mm","Solid":"2x (2.5 ... 16 mm²)","Width":"90 mm","title":"3RV2142-4FA10","Height":"165 mm","Upwards":"150 mm","Forwards":"0 mm","Backwards":"0 mm","Downwards":"150 mm","Trip Class":"CLASS 10","At The Side":"30 mm","Rated Value":"20 ... 690 V","description":"Circuit breaker size S3 for motor protection CLASS 10 with overload relay function 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 with overload relay function","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","For Auxiliary And Control Circuit":"screw-type terminals","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 AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","Of The Auxiliary And Control Contacts":"M3","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 (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 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","For Auxiliary Contacts With Screw-Type Terminals":"0.8 ... 1.2 N·m","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/4186a8fba06e1d5d4a990edcc25bed95.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629986&mlfb=3RV2142-4FA10"},"ai":{"faq":[{"question":"What is the breaking capacity of 3RV2142-4FA10 at 400 V?","answer":"50 kA at 400 V. At 690 V it is rated for 6 kA. These are the maximum fault currents the breaker can safely interrupt at those voltages."},{"question":"What does CLASS 10 trip class mean for this breaker?","answer":"CLASS 10 means the overload relay will trip within 10 seconds at 7.2× the thermal setting. That is the standard for general-purpose induction motors with start times under about 6 seconds — pumps, fans, compressors."},{"question":"Where can I buy 3RV2142-4FA10?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm position."},{"question":"Will 3RV2142-4FA10 drop into a panel wired for 3RV2021-4NA25?","answer":"Both mount on 35 mm DIN rail and use screw terminals, but the frame size and terminal capacity differ. The 3RV2142-4FA10 accepts larger conductors (up to 70 mm² single) and has different clearance requirements (150 mm vertical). Check the physical fit before assuming a direct swap."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2142-4FA10","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/3RV2142-4FA10 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}}